Diamond Certified Companies are Rated Highest in Quality and Helpful Expertise.

  • Why this rating is the most accurate.
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Diamond certified companies are top rated and guaranteed

Why Trust Diamond Certified Window Companies Rated Highest in Quality?

Photo: American Home Renewal, Inc. (2002)

You are the customer. If your goal is to choose a window company that will deliver high customer satisfaction and quality, you’ll feel confident in choosing a Diamond Certified window contractor. Each has been rated Highest in Quality in the most accurate ratings process anywhere. And you’re always backed by the Diamond Certified Performance Guarantee. Here’s why the Diamond Certified ratings and certification process will help you find a top-rated window company and is unparalleled in its accuracy, rigor and usefulness:

1) Accuracy: All research is performed by live telephone interviews that verify only real customers are surveyed, so you’ll never be fooled by fake reviews.

2) Statistical Reliability: A large random sample of past customers is surveyed on an ongoing basis so the research results you see truly reflect a Diamond Certified company’s top-rated status.

3) Full Disclosure: By clicking the name of a company above you’ll see the exact rating results in charts and read verbatim survey responses as well as researched articles on each qualified company.

4) Guaranteed: Your purchase is backed up with mediation and the Diamond Certified Performance Guarantee, so you can choose with confidence.

Click on the name of a Diamond Certified company above to read ratings results, researched articles and verbatim customer survey responses to help you make an informed decision.

More than 200,000 customers of local companies have been interviewed in live telephone calls, and only companies that score Highest in Quality in customer satisfaction–a 90+ on a 100 scale–as well as pass all of the credential-based ratings earn Diamond Certified. By requiring such a high score to qualify, the Diamond Certified program eliminates mediocre and poorly performing companies. Read detailed information about the ratings and certification process.

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Eric Holder is a lifetime veteran of the window industry and owner of Able Glass Company, a Diamond Certified company since 2002. He can be reached at (408) 256-3998 or by email.

Eric Holder

diamond certified contributor profile and expert article

Eric Holder: A Clear Perspective

By James Florence, Diamond Certified Program Reporter

SANTA CLARA — With a family background in the glass and window business, Eric Holder always had a clear view of where his career path would ultimately lead him. “My father worked for this company back in the 1950s and eventually bought out the original owners, so I’ve been around it all my life,” he affirms. “After high school, I went to college and majored in business. By the time I graduated, my dad was at a point where he was ready to retire, so at the age of 21, I took over ownership of the company.”

Today, as owner of Able Glass Company, Eric says his favorite part of his job is taking care of customers. “I get the most enjoyment from achieving customer satisfaction. When a customer calls and is hysterical about a broken or leaking window, it’s very gratifying when we’re able to go out there, take care of the issue and leave them happy.”

Born and raised in the Bay Area, Eric resides today in San Jose with his wife, Shandi, and their three sons, Austin, Dylan and Evan. In addition to the Bay Area’s temperate weather, Eric says he appreciates the diversity of the landscape. “There’s an incredible variety of things to do here, especially since we’re so close to everything. Whether you want to go to the beach, the mountains or the city, you’re just a short drive away.”

Outside of work, Eric takes every opportunity to get outdoors and spend time with his family. “We love going to the beach, and we enjoy going fishing when we can,” he says. “Also, the boys are active in sports, so most weekends we’re attending their baseball or soccer games.” In addition to his sons’ sporting events, Eric likes keeping up with local professional sports teams. “I support all of our local teams, but I attend San Jose Sharks games the most, since they’re right here in town.”

In regard to his professional career, Eric believes in the importance of providing every customer with quality, attentive service. “It’s always been a pet peeve of mine to walk into a business and not be greeted or receive service, so I’m always thinking about my own business from that perspective,” he says. “I try to treat every customer with respect, get them the best value for their money and, most importantly, give them the end result they’re looking for. I just want them to be completely satisfied with everything.”

When asked the first thing he’d do if he could retire tomorrow, Eric says he’d take an extended vacation. “I would take my family on a trip and just get away for a while. Running a business keeps me very busy, so it’d be nice to go to Hawaii and just spend a week or two relaxing on the beach.”

Ask Me Anything!

Q: What’s your favorite local restaurant?
A: Holder’s Country Inn in San Jose. My cousin owns it, so I’m there quite a lot.

Q: What’s your favorite thing to do on a rainy day?
A: Watch a movie.

Q: What’s your favorite movie?
A: It’s a tie between “Scarface” and “The Godfather.”

Q: Are you an early bird or a night owl?
A: An early bird.

Q: What’s your favorite thing to eat for breakfast?
A: Bacon and poached eggs.

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Deciding Between New and Retrofit Windows


SANTA CLARA — When replacing a window in your home, you have two basic options: installing a new construction window or doing a retrofit application. With a new construction installation, the existing window is removed (frame and all) and replaced with a… Read more

Expert Video Tip

Video: Comparing Window Frame Systems

Complete Video Transcription:

SANTA CLARA — Host, Sarah Rutan: If you’re planning to replace your home’s window frames, it’s helpful to know the full extent of your options. Today we’re in… Read more

Ruben Cordova is owner of Cordova Construction, a Diamond Certified company. He can be reached at (408) 782-4926 or by email.

Ruben Cordova

diamond certified contributor profile and expert article

Ruben Cordova: A Window of Opportunity

By James Florence, Diamond Certified Resource Reporter

SAN JOSE — When Ruben Cordova started installing windows early in his construction career, he didn’t know he was laying the framework for a much bigger opportunity to come. “I started working construction when I was 18 years old,” he remembers. “The first company I worked for was a general contractor, where I got experience with all aspects of home construction. A year later, I went to work for a window company and was given the opportunity to monitor a crew. In 2001, I moved to San Jose, where I continued to install windows. My customers noticed the level of attention I gave to the job, and some asked me if I did other things. That led to me expanding the scope of my work—I started doing small kitchen and bathroom remodels and continued to grow from there. So, by the time I applied for my license in 2006, I had quite a bit of experience under my belt.”

Today, as owner of Cordova Construction, Ruben says his favorite part of his job is the daily dance of coordinating projects. “I love getting up in the morning, putting together the schedule, picking up materials—just the process of pulling all the details together. Naturally, I like to see the finished product of our work, but there’s something about the preparation stages that I especially enjoy.”

A resident of San Jose, Ruben spends most of his time outside of work with his family. “My wife, Laura, and I have five children, ages two to 23,” he details. “My kids always help me with the business—my younger daughters go with me to do estimates on the weekends, and my son and older daughter work for me in the field and in the office. When we’re not working, we enjoy playing with our cats, eating dinner together and having family karaoke sing-alongs.”

When asked about the prospect of future retirement, Ruben says it’s an unlikely scenario. “I cannot retire. I’ve been doing this my whole life, and I plan to keep doing it for as long as I can.”

Ask Me Anything!

Q: What kinds of music do you like?
A: I like all kinds of music, but I particularly enjoy live performances. There’s something about the live artistic expression and connection with the audience that can’t be captured in a studio recording.

Q: What’s your favorite season?
A: Whenever it doesn’t rain, which is most of the time in California.

Q: If you could travel anywhere in the world, where would you go?
A: Italy. I’ve always wanted to see the Colosseum and the Tower of Pisa.

Q: Do you collect anything?
A: I collect work vehicles. I have a van for painting, a van for stucco, a truck for cement and many more. Everybody tells me I have too many, but I like having a vehicle ready to go for any given type of job.

Q: What’s your favorite type of food?
A: Mexican-style tacos. They’re my weakness!

Read more

An Alternative Approach to Planning a Remodel


SAN JOSE — When planning for a remodel, homeowners often start by looking at cost and let that dictate the form the project takes. While this may be a financially prudent approach, it can also limit the project’s possibilities and… Read more

Expert Video Tip

Video: An Important Investment for Remodeling

Complete Video Transcription:

SAN JOSE — Ruben Cordova: When thinking about new construction or remodel projects, you want to make sure to invest in higher-quality materials for items that get… Read more




Andersen Windows
Loewen Windows
Marvin Windows
Milgard Windows
Champion Windows
Empire Pacific
Jeld-Wen Windows
Kolbe Windows
Kolbe Millwork Windows
Norco Windows
Pella Windows
PGT Windows
American Craftsman
Anlin Window Systems
CertainTeed Windows
Silver Line Windows
Simonton Windows
Weather Shield

basement window repair
home window replacements
storm window installation
vinyl replacement windows
window replacing
exterior windows
window screen repair
awning windows
home window repair
insulated windows
crank windows
jalousie windows
window sash replacement
broken window repair
window pane replacement
bay replacement windows
retrofit windows
sliding window replacement
window weatherstripping
wooden window repair
replacement windows
new windows
casement window installation
vinyl window installation
aluminum window installation
window sash repair
picture window replacement
wood window installation
double-hung window installation

Blossom Valley
East Palo Alto
Holy City
Los Altos
Los Altos Hills
Los Gatos
Monte Sereno
Monte Vista
Morgan Hill
Mountain View
Mt Hamilton
New Almaden
Palo Alto
Redwood Estates
San Jose
San Martin
Santa Clara


American Window and Door Institute (AWDI) (www.awdi.com)
California Association of Window Manufacturers
Energy Star (www.energystar.gov)
Efficient Windows Collaborative (EWC) (www.efficientwindows.org)
National Fenestration Rating Council (NFRC) (www.nfrc.org)
Stained Glass Association of America (http://stainedglass.org)
Window & Door Manufacturers Association (WDMA) (www.wdma.com)

Know What You Want
Know What You Want from Your New Windows

Before you make any interview phone calls or sit down to discuss your job with any local window contractors in Santa Clara County, you’ll want to have a clear idea of the scope of your project, the type of windows you want and what traits you’re looking for from a window contractor.

Many homeowners find it helps to write down ideas and keep a file of questions and samples so that you can present a clear and coordinated list to the contractors. The next six questions will get you started.

  • Do I want a Diamond Certified company that is rated Highest in Quality and backed by the Diamond Certified Performance Guarantee?
  • What is my overall goal in getting my home windows replaced?
  • What is my budget for window replacement services?
  • What type of material do I want my new windows to be made from?
  • Is there a specific aesthetic or look I want in my new windows?
  • Do I plan to live in this home long-term, or is it a rental property or a house I plan to sell? How does this impact my decision on buying new windows?
  • What characteristics do I want in a Santa Clara County window contractor? This could include communication skills, starting the job on time and sticking to the schedule throughout the job, specific warranties or guarantees, and follow-up service.
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What To Ask In Person
Questions to Ask When You Meet Window Contractors in Person
  • What windows do you recommend for my home or business?
  • Why do you recommend that brand or window style?
  • How much time will the job take, from ordering the new windows to installation?
  • Will I be able to stay in my home during the installation?
  • Will my new windows reduce my electric bills?
  • Do you have any recently completed window installations in my area of Santa Clara County where I can see how the windows look from the street?
  • Do you have customer references I can call?
  • How do you finish the windows after installation?
  • If I want my new window frames painted or stained, do you offer that service or will I have to hire a separate contractor?
  • How would I handle service issues after the window installation is complete? Are you responsible for warranty work if there’s ever a problem with my new windows?
  • What can I do to make this process faster and easier?
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  • What To Ask References
    Hear About Previous Customers’ Experiences with Santa Clara County Window Contractors

    It’s best to choose a Diamond Certified window contractor because all certified companies have passed an in-depth ratings process that most other companies can’t pass. If you want quality window companies in Santa Clara County and the greater Bay Area, you can feel confident choosing a Diamond Certified company. Diamond Certified reports are available online for all certified companies. And you’ll never be fooled by fake reviews. That’s because all research is performed in live telephone interviews of verified customers.

    If you do call references on your own, specifically ask the company representative for a list of 10 of their most recent customers. This will help avoid them giving you a hand-picked list of only customers they know were satisfied. While it’s not optimal, talking to these references can give you an insider’s view on how the Santa Clara County window contractors performed on previous jobs. So call several references and ask them specific questions about the contractor you’re considering.

    Here are some sample questions that can help you determine whether the window contractors you’re considering are a good fit for you:

    • Were you satisfied with the window installation and customer service from _(window company name)_?
    • What was the type and scope of job they did for you (window replacement, window repair, whole house window installation, etc.)?
    • Did the Santa Clara County window contractor you hired complete the work on time?
    • Were their estimates carefully-done and accurate?
    • Were there unexpected costs? If so, what were they?
    • Did the contractor keep you up-to-date on the status of the project?
    • If you live in a smaller town such as Monte Sereno, Monte Vista, Permanente, San Martin, Stanford, Los Altos Hills or in Silicon Valley, did they charge extra to travel to your home?
    • Did the window installers show up on time?
    • Did they clean up after finishing the window installation?
    • If you need new windows in the future, would you use this window contractor again?
    • Would you recommend them?
    • Can I visit your home to see the completed window installation?
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  • Review Your Options
    Locate and Hire a Good Window Company in Santa Clara County

    The Diamond Certified symbol has been awarded to companies that scored Highest in Quality in an accurate ratings process.

    Your choice of window contractor impacts every part of your job, from the installation to how long your new windows last. So before deciding on the best window contractor in Santa Clara County for you, it’s important to consider the following questions.

    • Can the window contractors meet your needs in terms of scheduling, products and installation preferences?
    • Are the Santa Clara County window contractors knowledgeable on the products they offer? Can they tell you which products best suit your needs and why (i.e. aluminum windows, insulated windows, vinyl windows, energy efficient windows)?
    • Is the window installation company sensitive to your budget? Can they offer various products that fit your resources? Most contractors will give you bids for Good, Better and Best options that include a choice of product, design, prices, brand names and services.
    • Do the window contractors in Santa Clara County offer warranties in the event of a product failure or installation error? Will they put these guarantees in writing?

    It’s also smart to note your own expectations, realizing that some may not be congruous with the project. For example, it may not be realistic to expect a steady schedule or a quiet worksite when having new windows installed. You’re most likely to be satisfied with the process when you talk with your contractor before the job begins and discuss realities and expectations from both your view and the window contractor’s.

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  • How To Work With
    Attract the Best Local Window Installers to Bid on Your Job

    In this buyer’s market, you might be surprised to find you’re not the only one who is interviewing and selecting potential candidates. Santa Clara County window companies, including those in the larger cities of Santa Clara, Milpitas, Campbell, Sunnyvale, San Jose and Mountain View and even some in the smaller towns, can also be selective about which jobs they accept. Bids take time and are expensive to prepare, and many contractors have lost money and faced difficult dealings with unreasonable homeowners. That can make them choosy about whose projects they accept.

    Here are some ways you can encourage good window contractors to want to bid on your job:

    • Be honest about the fact that you’re accepting other bids and interviewing other window contractors, but assure them you’re gathering three bids, not dozens.
    • Look for good value, not just the lowest price. The first question that contractors often hear is about price, so it’s important to show them you understand the importance of quality and overall value.
    • Shop among local window contractors. Most like to stay in the local area so they can provide better service in a more timely fashion. It also shows the contractors you’re serious about quality products and good installation methods, as some fly-by-night contractors travel long distances to install cheap products that local contractors may not be able to compete with price-wise.

    Get the Most Out of Your Deal with Local Window Contractors in Santa Clara County
    You’ve finally found the perfect Santa Clara County window contractor that meets all your requirements. Now is the time to ask your window installer for a contract. It should include written affirmation of price, quality and warrantees (manufacturer and installer). They should also be willing to provide you with a written timeline that includes the start date, major milestones and completion date.

    Remember, start and end dates are important, but there are some factors you and your installer can’t control, such as the weather or products that are damaged during shipping. That’s why it’s a smart idea to add a no-later-than clause to your contract. This stipulates the date by which all work must be completed. Even if inclement weather or problems with the products delay installation, this clause will give you assurance that your job will be finished on time. If a quick turnaround is important to you, you may also want to consider adding a bonus for early completion to your contract.

    Confirm any warrantees before signing the contract, as some window installers in Santa Clara County only guarantee certain brands or installations. Also verify that manufacturer warrantees apply.

    And don’t forget about related issues that may not be covered by a standard contract. For example, no matter how careful your window installer is, crushed flowers, rutted lawns and damaged shrubs are often unexpected hazards that come with hiring a window contractor in Santa Clara County. But you can protect yourself and your property by being proactive. Before work begins, ask the job supervisor to accompany you on a pre-work inspection to determine the original condition of the property. List or photograph the condition of your landscaping and property before the work begins. Talk with your contractor about reasonable expectations and steps for protecting your home and yard during the window installation. When you’ve reached an agreement about the pre-work condition of the property, both you and the contractor should sign and date the document. After the work is completed, do a final inspection together to confirm your expectations were met.

    The contract you sign with a Santa Clara County window company should protect you and your contractor. For this reason, never sign an incomplete or blank estimate. Read the entire contract and understand all terms before signing. And don’t be afraid to write in requests or verbal agreements you’ve made with your representative.

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  • Be a Good Customer
    How Can You Be a Good Window Company Customer

    It’s the window company’s responsibility put in quality windows using the best possible installation techniques. But you play a big part in the success of your new window installation, too. Here are a few simple steps you can take to be a good customer when hiring a Santa Clara County window contractor.

    • Be clear and upfront with the window contractor or window company representative. Let them know the long-term outcome you’re expecting from your windows and specific ways they can satisfy your expectations.
    • Bear in mind, a friendly smile goes a long way in fostering a good working relationship.
    • Before you hire a window contractor in Santa Clara County, restate your goals and expectations, and reiterate to the window company representative your understanding of the agreement. By being clear about your expectations and theirs, you can avoid most conflicts.
    • Ask your window installer if you should call to check on the progress or if he will call you with updates.
    • Give your service representative a phone number where they can reach you at all times. The window installation will move along more smoothly if your window company can reach you for any necessary updates, questions or work authorizations.
    • When your contractor contacts you, return calls promptly.
    • Pay the contractor for the new windows and installation promptly.

    Why would you want to be a good customer? Window installers in Santa Clara County appreciate customers who are straightforward, honest and easy to work with. Your good customer behavior sets the tone from your end and creates an environment conducive to a good relationship. Things may very well go smoother and any problems may be more easily resolved.

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Check The Work
Compare the Window Installation Work and Written Invoice

When the work is completed, most good window contractors in Santa Clara County will give you a written invoice detailing all completed work. This invoice usually includes:

  • The name and physical address of the window contractor.
  • A list of all window replacement, installation or window repairs performed.
  • An itemized list of all new windows and window replacement parts.
  • The total window installation cost, including the amount due for labor.
  • Warrantees and guarantees provided by the window manufacturers and the window installers.

It’s smart to compare the written invoice to the work that was actually done. Ask your window company representative to walk through the job with you and show you the window repairs and installation. Check the completed work against the invoice. Your window company should be willing to talk you through the process and give you any special instructions for operating your new windows and maintaining them over the life of the product. If you have questions about what work was done or how the installation was completed, this is the time to ask.

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Written Warranties
Ask the Santa Clara County Window Installers for Written Warranties

Before the Santa Clara County window contractors leave the jobsite, confirm any warranties. Not all window companies back up their work with warranties. But if the shop you’ve chosen does guarantee the new windows and their installation, they should give you a written warranty, including:

  • The window contractor’s name and physical address.
  • Terms of and limitations on the new window warranty.
  • What is covered by the warranties, including whether the contractor will replace or repair your windows or give you a refund if there is a warranty claim. Exclusions should be in writing.
  • Your responsibility if you need warranty work or replacement windows (i.e., if you have to pay for labor when filing a claim for window warranty work or pay a prorated amount).
  • Whether the new window warranties transfer to the new owner if you sell your home and how to make that warranty transfer valid if there are any stipulations.
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Top 10 Requests
Homeowners’ Top Requests for Santa Clara County Window Contractors

Requests for new and replacement windows listed below are available within Santa Clara County. Read the paragraphs below for the definition of each type of window repair, replacement and new window services.

New Windows
New windows are usually installed in new construction and remodels. They differ from replacement windows because they have a nailing fin along the outer frame and are nailed in from the outside of the home before siding or exterior trim is installed.

Replacement Windows
When existing windows deteriorate, replacement windows are often the solution to upgrade efficiency, security and appearance. Santa Clara County window contractors usually install replacement windows in existing window spaces, using the existing trim and cladding. Drop-in replacement windows are designed for minimal disruption of the existing structure and are often the least expensive option.

Window Repair Services in Santa Clara County
Window installers in Santa Clara County are often asked to repair old windows and windows that have been broken. Some contractors specialize in repairing and restoring old windows to maintain historic homes. Others repair window frames and provide routine maintenance for modern windows.

Storm Windows
Storm windows are added to existing windows to increase efficiency. They can be permanent or temporary windows mounted externally or internally to existing windows.

Casement Windows
Casement windows are those that are attached to the window frame by hinges located on the side of the windows. (Windows that are hinged at the top are called awning windows, while windows attached at the bottom are hopper windows.) Casement windows may contain leaded glass and often open inward.

New Aluminum Windows
Known as strong, durable and easy-to-configure, aluminum windows are often used to showcase beautiful views. They are also a less-expensive option in homes and light commercial buildings. Aluminum windows are not traditionally the most efficient, but more recent aluminum windows are more energy efficient than previous designs.

New Vinyl Windows
Vinyl windows are a favorite of Santa Clara County homeowners in San Jose, Gilroy, Santa Clara, Morgan Hill and other cities because they are inexpensive, durable, energy efficient and nearly maintenance-free.

Double-hung Window Installation
Perhaps the most popular type of window, double-hung windows consist of upper and lower window sashes that slide vertically in side window jambs. They have a maximum opening of one-half the total window area.

Bay Windows
Bay windows are popular requests in Santa Clara County because they project outward from the main walls of a home. This creates a larger living space or the illusion of a larger room depending on the type of bay window. Bay windows also add architectural interest and increase the amount of natural light that flows into a room.

Energy Efficient Windows
Energy efficient windows are often designated with an Energy Star label. These windows are known to drastically reduce energy bills. Most energy efficient windows are insulated and protect against heat loss and gain, maintaining indoor air temperature.

Top 10 Requested Window Brands in the Santa Clara Area
Many window installers in Santa Clara County have preferred window brands they install. The most-requested window brands are listed below.

  • Marvin Windows
    From energy efficient to fully customized designs, Marvin Windows is one of the most recognized window manufacturers. Marvin Authorized Installing Retailers in Santa Clara County sell and install all types of Marvin Windows.
  • Champion Windows
    Champion Windows is popular for home replacement windows that are custom-made and professionally-installed. They also have Energy Star windows and other energy efficient replacement windows.
  • Milgard Windows
    Vinyl windows, fiberglass windows, aluminum windows and sound control windows for homes and light commercial buildings (such as hospitals and schools) are all available in Santa Clara County from Milgard.
  • Simonton Windows
    Some window contractors in Santa Clara County install new construction and replacement windows by Simonton Windows. These include awning windows, double-hung windows, garden windows, casement windows, radius windows, single hung windows and single slider windows.
  • Pella Windows
    For more than 85 years, Pella Windows has been making and installing windows. Home window styles available from Pella include casement, awning, double-hung, single-hung, sliding, bay/bow windows and specially-shaped windows that add architectural detail to your home.
  • Andersen Windows
    Andersen Windows is one of the most trusted brands of new windows. Andersen dealers in Santa Clara County offer replacement windows in a full range of materials and styles.
  • PGT Windows
    Custom impact-resistant windows meant to increase the style, safety and security of your home are manufactured by PGT Windows. Available windows include new construction and replacement windows with aluminum and vinyl frames. PPG also manufactures hurricane windows that stand up to strong winds and debris impact.
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Glossary Of Terms
Glossary of Terms for New Home Windows and Window Contractor Services

Below are terms and descriptions that will help you navigate your way through your replacement window installation from beginning to end.

aluminum windows
Glazed window with aluminum sash and mullions. Aluminum windows are known for strength, value and flexibility in installation configurations to maximize views.

Also known as: aluminum storm windows, aluminum window frames, aluminum replacement windows, aluminum clad windows, aluminum window replacement, aluminum window repair, residential aluminum windows, aluminum frame windows

awning windows
Awning windows have a hinged upper sash that swings outward for ventilation.

Also known as: ventilation windows, awning window replacement, awning replacement windows

bay windows
Bay windows are a unit of three windows, usually made up of a large center fixed window unit and two flanking windows positioned at 30-, 45- or 90-degree angles that project out from the wall. Bay windows may increase the size of a room or may give the appearance of a larger room depending on the construction. Some bay windows have built-in seating and are used as window seats.

Also known as: bow windows, angle bay windows, window seat windows, bay bow windows, bow bay windows, replacement bay windows

casement windows
Windows that are side-hinged or pivoted are known as casement windows. Casement windows have a single sash that cranks outward, to the right or left.

Also known as: crank out windows, casement replacement windows, vinyl casement windows, casement window repair, wood casement windows, steel casement windows, aluminum casement windows, double-hung casement windows, French casement windows, metal casement windows

dormer windows
Dormer windows protrude from the roof of a house. Dormer windows usually include one or more window panes.

Also known as: gable fronted dormer windows, hipped roof dormer windows, flat roof dormer windows, shed dormer windows, wall dormer window, link dormer window, window dormers

double-hung windows
Windows that have two operable sashes which slide vertically in the frame to open and close are known as double-hung windows.

Also known as: sash windows

double glazing windows
Any window made with two thicknesses of glass that are separated by airspace. Double-glazed windows increase energy efficiency and insulate against heat transfer and sound transmission.

Also known as: dual glazing windows, double glazed windows, insulated glazing, insulated glazing windows, double glazing sash windows, double glazed sash windows, energy efficient windows, conservatory windows, Energy Star windows, insulated glass, double-pane windows

dual-action windows
Windows with sashes that open for ventilation and swing open from the top or the side to allow cleaning of the outside glass.

Also known as: sliding windows, swinging windows

Energy Star windows
Energy Star is a government program that established a set of guidelines for energy efficiency. Windows that are Energy Star Qualified meet efficiency requirements and can save seven to 15 percent on home energy bills compared to non-Energy Star windows. Most Energy Star windows are insulated windows or double-paned or triple-paned windows that keep temperature-controlled air in the home and heat or cold out.

Also known as: energy efficient windows, insulated windows, energy efficient vinyl windows, energy efficient window replacements, energy efficient glass windows, energy efficient home windows, energy efficient wood windows

fixed windows
Non-venting or non-operable windows made of fixed glass are referred to as fixed windows. Fixed windows are also known as picture windows and can be reglazed and replaced on-site.

Also known as: picture windows, fixed casement windows, fixed picture windows, fixed vinyl windows

hopper windows
Windows with a top sash that swings inward. Hopper widows are often used in basements and other areas where ventilation is wanted but large windows are not required.

Also known as: casement windows, ventilation windows, basement hopper windows, hopper style windows, vinyl hopper windows

insulating glass
Insulated glass is usually a combination of two or more panes of glass with a sealed air space between the panes that is filled with a harmless gas. This space may be filled with an inert gas, which increases the insulation properties. Most major window companies offer insulated windows as part of their standard catalog.

Also known as: insulated windows, energy efficient windows, Energy Star windows,  insulated glazing, insulated glass, IG, double insulated glass, insulating glass, insulated replacement glass, insulated window glass, insulated glass windows, low-e insulated glass, insulated glass units, window glass insulation

jalousie windows
Windows with a series of overlapping, horizontal louvers that move together are called jalousie windows. Window louver panels open to maximize airflow through the openings.

Also known as: venetian blind windows, shutter windows, blind windows, aluminum jalousie windows, jalousie windows replacement

Window mullions are a vertical structural element that divides window panes and separates side-by-side windows.

Also known as: window divider, window column, aluminum mullions, aluminum window mullions, mullion replacement, replacement mullions, removable mullions, wooden mullions, wood window mullions

picture windows
Non-venting and non-operable windows are generally referred to as picture windows. Also know as fixed windows, picture windows only consist of window frames and glass. Most picture windows are double-paned or insulated to be more energy efficient since they have such a large surface area.

Also known as: fixed windows, non-opening windows, plate glass windows, picture replacement windows, vinyl picture windows

Thermal resistance to the transfer of heat through windows. Windows with higher
R-value have greater insulating properties.

replacement windows
Replacement windows are custom ordered to fit inside the jambs and sill of your existing windows. Replacement windows are usually less expensive to install than installing new windows that require new frames, jambs and window sills.

Also known as: window replacements, vinyl replacement windows, wood replacement windows, aluminum replacement windows, window pane replacements

single glazing
A single pane of glass installed in a window sash. Single-glazed windows are not as energy-efficient as double-glazed windows.

Also known as: conservatory windows, sun room windows,

single-hung windows
Single-hung windows look similar to double-hung windows, except the top sash is fixed and stationary, so only the bottom section opens.

storm windows
Mounted outside or inside the main glass, storm windows are often found in cold climates or as a retrofit of existing windows. Storm windows increase the efficiency of glass windows and can be mounted temporarily or permanently.

Also known as: replacement storm windows, aluminum storm windows, interior storm windows, home storm windows, vinyl storm windows, triple track storm windows, custom storm windows, combination storm windows, exterior storm windows

vinyl windows
Windows made with vinyl, a plastic material, cladding and window units. Vinyl windows are popular because they are relatively inexpensive and maintenance-free.

Also known as: replacement windows, vinyl home windows, vinyl casement windows, maintenance-free windows, vinyl bay windows,

window casing
Also known as window trim, window casing is exposed molding of various widths, thickness and shapes that covers the framework of window and door units.

Also known as: window trim, interior window casing, flexible window casing, decorative window casing, exterior window casing, window interior casing, window molding

window cladding
Cladding is material applied to the outside faces of windows to provide a durable, low-maintenance exterior surface. Cladding often provides protection from the elements and adds an aesthetic touch. It may also be referred to as window capping, which is a specialized field offered by few window contractors.

Also known as: cladded windows, clad windows, vinyl-clad windows

window sash
Window sashes are single frame assemblies of stiles and rails (explain stiles and rails) that hold the glass.

Also known as: window frames, window sashes, window sash repair, double-hung window sash, wood sash windows, antique window sash, window sash replacement

wood windows
Wood windows are those with wooden frames. They are a natural option, so they require more maintenance than vinyl windows, and they must be protected from moisture to avoid warping and rot.

Also known as: wooden windows, wood replacement windows, wood clad windows, custom wood windows, wood casement windows, wood double-hung windows, wood storm windows, aluminum-clad wood windows, exterior wood windows, wood window replacements, historic windows, historic wood windows

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Frequently Asked Questions
Frequently Asked Questions for Local Window Contractors

Q: Why choose a Diamond Certified Window Company?
A: Diamond Certified ends the guessing game by helping you choose a window contractor with confidence by offering a list of top-rated local companies who have passed the country’s most in-depth rating process. Only window companies rated Highest in Quality earn the prestigious Diamond Certified award. Most local window companies can’t pass the ratings. American Ratings Corporation also monitors every Diamond Certified company with in-depth and ongoing research and ratings. And your window installation purchase is backed by the Diamond Certified Performance Guarantee. So you’ll feel confident choosing a Diamond Certified window company for your new windows.

Q: How will replacing my windows improve the comfort of my home?
A: New windows will make your home quieter and more secure. Depending on the windows you choose, you may also notice a marked difference in the temperature of your home as well. Double-paned windows are insulated to keep out the heat of the summer, and maintain heat during the winter.

Q: Will replacing my old windows save me money?
A: Old windows and windows that are improperly installed are the biggest cause of energy loss in the home, costing you money every day. New windows will save you money over the life of the window by cutting heating and cooling costs. Some homeowners report savings of up to 30 percent on their utility bills after installing new windows. New windows can also increase the life of your furnishings and carpeting by keeping out harmful rays of the sun, so you’ll save money by not having to replace expensive furnishings.

Q: If I decide to sell my home, will new windows and doors increase the value?
A: Yes. New windows are one of the best home improvements you can make in terms of the return on your investment. Realtors report that Bay Area homes with new energy-efficient, maintenance-free windows can see return of up to 114% in resale value.

Q: What window materials do I have to choose from?
A: Your choices for new windows are wood, vinyl, steel, aluminum, fiberglass and composite. You’ll see the sash and the frame (the visible outer parts of the window installation units) from the inside and outside of your home, so it’s important to choose the material that gives you the look you want. It’s also important to select the material that has the attributes you’re looking for. For example, metal window frames can conduct heat and cold, so they may not be as energy efficient as wood or vinyl windows. Additionally, some window frame materials can be painted to match your home’s exterior or interior, so that may be an important consideration.

Wood windows can be painted and stained. The downside to wood windows is that they must be regularly maintained. However, most wood windows are made from rot-resistant woods. When maintained correctly, they can last as long as metal windows.

Vinyl windows are inexpensive, energy efficient and durable. And while they cannot be painted, they come in a variety of colors and are virtually maintenance-free.

Steel windows are rarely used in residential buildings, as they aren’t as energy efficient as other types of windows and the window must be painted so they don’t rust.

Aluminum windows are strong and durable. They also allow for greater flexibility in window design. However, they aren’t as energy efficient as other types of windows.

Fiberglass windows are durable, efficient and strong. The frames can be painted to match any home. Because of their quality and durability, fiberglass windows are some of the more expensive widows on the market.

Composite windows have sashes and frames made from more than one type of material. This allows the manufacturer to customize the windows to fit the exact needs of the consumer. Some composite windows have a wood interior that can be painted with more efficient material such as vinyl or aluminum that better resists weather. New composite windows can be made from recycled wood and plastic that can be painted but resist rot.

Q: How do I know which kind of windows are the best choice for me?
A: Your local window contractor will help you decide which manufacturer, style and material of windows is the best fit for your budget, home and aesthetic preferences. It’s wise to make a list of what you’re looking for in new windows so that your window installer can help you decide which windows best fit your needs.

Q: How much do new windows cost?
A: The cost of new windows greatly varies based on the type of windows you select, the manufacturer and the number of windows you have installed. It also depends on whether you’re having replacement windows installed (windows that are custom ordered to fit in place of your existing windows) or whether you’re having new window frames and jambs installed as well. Your window contractor can provide an estimate based on your specific requirements.

Q: How long will it take to install new windows?
A: That depends on the size and scope of your job. A simple window installation may take an hour, while installing new windows throughout an entire home may take several days or a week. Your window contractor should be able to give you an estimated time frame on your specific project.

Q: Can I put in new windows myself?
A: Like with many home improvement projects, you can replace your windows yourself. However, for most window replacement jobs, it’s better to hire a skilled professional. Professional window installers know the best materials and installation techniques for the job. And because they have so much experience removing old windows and installing new ones, they can do the job faster and much more effectively than can most homeowners.

Q: What about getting my new windows from a home improvement store?
A: Most home improvement stores sell new windows, and many advertise low prices. But you may sacrifice selection and quality by getting your new windows from a home improvement store. Most have a smaller selection, so you may not get the windows that best suit your home and your needs. And if they sell discount windows or off-brand products that are less expensive, you run a greater risk that the manufacturer will go out of business, leaving any warranties null and void. Another factor to consider is that most home improvement warehouses don’t provide installation or they rely on subcontractors. That means you can be caught between the retailer, the manufacturer and the installer if there are any problems with your windows.

Q: I’ve heard it’s important to hire a local window contractor that is an authorized installer. What does that mean and why should I look for a certified window installer?
A: Most major window manufacturers certify window contractors whom they have trained to install their specific products. These authorized installers also sell new windows and replacement windows. You’re likely to get a better installation, and some manufacturers even offer extended warranties on products their installers put in. And if something goes wrong later, you can avoid added hassle by hiring the same contractor for the purchase and installation of new windows one company will be responsible for the work.

Q: What happens if someone gets hurt while working on a job on my property?
A: When you hire a legitimate window contractor with the correct license, liability insurance and workers’ compensation insurance, you won’t have to worry. Under workers’ compensation insurance, every employee of the company is covered in the case of accident or injury. You will not be held responsible for damages. Make sure you ask your contractor to show you a copy of their active workers’ compensation policy.

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