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

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Diamond certified companies are top rated and guaranteed

Why Trust Diamond Certified Window Companies Rated Highest in Quality and Helpful Expertise®?

Photo: Save Energy Company (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 and Helpful Expertise® 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 and Helpful Expertise®–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 Resource eliminates mediocre and poorly performing companies. Read detailed information about the ratings and certification process.

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John Gorman is a 30-year veteran of the window industry and owner of Save Energy Company, a Diamond Certified Company since 2002. He can be reached at (707) 702-1918 or at [email protected]

John Gorman

diamond certified contributor profile and expert article

John Gorman: One Man’s Journey

By MATTHEW SOLIS, Senior Editor Diamond Certified Resource

John Gorman has been enjoying a successful career in the window and door industry for the past 30 years, but the path he followed to get to his current destination wasn’t always clear. In fact, a career in windows wasn’t even on John’s radar until he received an intriguing proposition from a trusted relative. “I was living in New York studying literature and got a call from my older brother,” he remembers. “He was working for a window company in Northern California and wanted to start his own firm, and he asked if I would join him. I said, ‘Sure, I’ll check out California for a little bit.’ Thirty years later, Save Energy Company is still going strong. My brother left in 1999 to do financial planning, but his wife, Pat, is still my business partner.”

When John arrived in the Bay Area, his affinity for his new environment was largely due to the natural beauty he found himself surrounded by—a stark contrast to the urban sprawl of New York and an attraction that remains strong three decades later. “I love living here because I’m surrounded by natural beauty,” he says. “Point Reyes National Seashore and the Golden Gate National Recreation Area are two of my favorite places to spend time. You can be out in the headlands and see a bobcat with the San Francisco skyline in the background…it’s pretty impressive.”

John’s love of nature is conducive to his chosen profession—window installation work requires a lot of time spent outdoors, and Save Energy Company’s wide ranging service area gives him a chance to explore numerous regions of the Bay Area. “That was particularly great in the beginning when I needed to find my way around,” he says. “After a certain amount of years, I’d start to think, ‘Oh, I’ve never been on this street,’ instead of being all wide eyed and wondering how to get anywhere.”

As with any outdoor enthusiast, John enjoys spending his free time playing golf, hiking in the Marin headlands and taking long walks through his hometown of Petaluma. “If I can stay out of a car, I’m a happy guy,” he laughs. “I also like listening to music, going out dancing with my wife and spending time with my son. He really likes the outdoors as well and is into things like rock climbing and bodybuilding.”

John Gorman’s journey from New York literature student to head of a successful California business wasn’t always a straightforward one, but he considers the path he forged to be crucial for where he finds himself today. “I’ve always like the quote, ‘Not all those who wander are lost,’” he says. “Just because someone doesn’t have a set direction doesn’t mean they’re completely at a loss. It’s more about the journey than the destination. The journey is the destination. I’ve had to get comfortable with that over the years, but I understand it better at this point in my life. Each day is enough.”



Q: What’s your favorite sports team?
A: The 49ers. It took me a while to get rid of my New York allegiance, though—I grew up a Jets guy during the Joe Namath days and switched to the Giants as I got older, but I’m loving the Niners now.

Q: What’s your favorite band?
A: The Grateful Dead. I admit it—I’m a Deadhead, which certainly made it easier to move out here 30 years ago. It was a lot of fun seeing them at places like the Greek Theater and Oakland Auditorium. I’ve probably seen them 30 or 40 times.

Q: Have you ever read a book more than once?
A: Sometimes a Great Notion by Ken Kesey. One Flew Over the Cuckoo’s Nest gets all the praise—and deservedly so—but this was a great book in its own right. Oh, and Go, Dog. Go! of course…a classic!

Q: Coffee or tea?
A: Coffee. I go back and forth, but I’d pick coffee if I had to.

Q: Are you a dog person or a cat person?
A: Dog person. We have a Rottweiler/Australian shepherd mix named Rudy. He’s a good guy.

Q: Which superpower: flight or super strength?
A: Flight, because there’s no need for strength if I’m flying around. What could be more fun than that?

Read more

How to Choose the Right Window Frames


PETALUMA — In the past, homeowners who wanted to replace their windows were somewhat limited in their choices. Today, consumers can choose from a wide variety of window options and find a product that best fits their lifestyle, budget and… Read more

Expert Video Tip

Video: Three Window Frame Options

Complete Video Transcription:

PETALUMA — Host, Sarah Rutan: If you’re shopping for windows, you’ll need to decide whether to have wood, vinyl, or fiberglass frames. So, we’re in Petaluma… Read more




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

replacement windows
new windows
picture window replacement
wood window installation
installation for double-hung windows
basement window repair
home window replacements
storm window installation
vinyl replacement windows
casement window installation
exterior windows
window screen repair
vinyl window installation
window replacing services
aluminum window installation
window sash 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

Agua Caliente
Alexander Valley
Bodega Bay
Boyes Hot Springs
Camp Meeker
Duncans Mills
El Verano
Fetters Hot Springs
Fort Ross
Glen Ellen
Mark West
Monte Rio
Rio Nido
Rohnert Park
Russian River
Russian River Meadows
Salmon Creek
Santa Rosa
Stewarts Pt Rancheria
Sea Ranch
Two Rock
Valley Ford
Villa Grande


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
Determine Your Goals and Desires for Your New Windows

Before you make initial phone calls or sit down to interview local window contractors in Sonoma County, you’ll want to have a clear idea of the scope of your project, the type of windows you want to buy and what characteristics you’re looking for in a windows contractor. Many homeowners find they stay better organized if they write down ideas and keep a file of questions and samples. This also allows you to present a clear and coordinated case to the contractors.

Explore the answers to these questions to get you started:

  1. Do I want a Diamond Certified company that is top rated and backed by the Diamond Certified Performance Guarantee?
  2. What is my overarching goal in getting my home windows replaced?
  3. What is my budget for new windows or window replacement services?
  4. Is there a specific design aesthetic or look I want from my new windows?
  5. What do I want the windows to be made from?
  6. Are there any specifics of my job that will make it more complicated or need to be accounted for during the planning phase (i.e. home located on a steep grade, narrow driveway which may be a problem for window supply trucks, a specific time frame in which I need my new windows)?
  7. Do I plan to live in this home long-term? Or is it a rental property or a house I plan to sell?
  8. What qualities or characteristics do I want in a Sonoma County window contractor? This could include good communication skills, timeliness, starting the job on time and sticking to the schedule, and reliable follow-up service.
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What To Ask In Person
Questions to Ask When You Meet Window Contractors in Person
  • 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 recent projects in my area of Sonoma 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? If I want them painted or stained, do you offer that service or will I have to hire a separate contractor?
  • How would I handle any future service issues? Are you responsible for warranty work if there’s ever a problem with my new windows?
  • What can I do to make the window purchase / installation process easier?
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  • What To Ask References
    Learn About Previous Customers’ Experiences with Local Window Contractors

    It’s best to choose a Diamond Certified window contractor because all certified companies have passed an in-depth rating process that most other companies can’t pass. For quality window installations in Sonoma County and the Greater Bay Area, you’ll have confidence choosing a Diamond Certified window company. Diamond Certified reports are available online at www.diamondcertified.org for all certified companies. And because all research is performed in live telephone interviews of actual customers, you’ll never be fooled by fake reviews.

    If you can’t find a Diamond Certified window contractor within reach, you’ll have to do some research on your own. If you do, it’s wise to call some references provided by your window company. Keep in mind, though, that references provided to you by the window companies are not equal in value to the large random sample of customers surveyed during the Diamond Certified ratings process. That’s because references given to customers from companies are cherry-picked instead of randomly selected from all their customers. So the contractors will likely give you a few customers to call that they know are satisfied.

    If you do call references on your own, specifically ask for a list of the company’s 10 most recent customers. This will help avoid them giving you the names of only customers they know were satisfied. Talking to these references can give you an insider’s view on how the Sonoma 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 a contractor is a good fit for you:

    1. Were you satisfied with the window installation and the service from _(window company name)_?
    2. What was the type and scope of job they did for you (window replacement, window repair, whole house window installation, window upgrades, etc.)?
    3. Did the Sonoma County window contractor you hired complete the work on time?
    4. Did the contractor keep you up-to-date on the status of the project?
    5. Were there unexpected costs? If so, what were they for and were they avoidable?
    6. If you live in a smaller town such as Penngrove, Fulton, Roseville, Fort Bragg or in West County, did they charge extra to travel to your home?
    7. Did the window installers show up on time?
    8. Did they clean up after finishing the window installation?
    9. If you need new windows in the future, would you use this window contractor again?
    10. Would you recommend them to friends or family?
    11. Can I visit your home to see the completed window installation?
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  • Review Your Options
    Final Steps to Hiring Good Window Companies in Sonoma 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 ease of the installation to how long your new windows will last. So before deciding a good window contractor in Sonoma County, it’s important to consider the following questions.

    1. Can the window contractors meet your needs in terms of scheduling, products and installation preferences?
    2. Are the Sonoma County window contractors knowledgeable on the products they sell and install? Can they tell you which products best suit your needs and why (i.e. aluminum windows, insulated windows, vinyl windows, energy efficient windows, wood windows, low-maintenance windows)?
    3. 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 choices of products, design and aesthetics, prices, brand names/manufacturers and services.
    4. Do the window contractors in Sonoma County offer warranties in the event of a product failure or installation error? Will they put these guarantees in writing?

    It’s also important to examine your expectations, realizing that some may not be possible considering the project at hand. For example, when having new windows installed it may not be realistic to expect a reliable schedule or a quiet worksite. You’re most likely to be satisfied with the process and with your new windows when you talk with your contractor before the job begins and discuss realities and expectations from both your view and theirs.

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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. Sonoma County window companies, including those in the larger cities of Healdsburg, Cotati, Petaluma, Santa Rosa and Windsor and even some in the smaller towns, can also be selective about which jobs they accept. Bids take time and expense to prepare, and many contractors have lost money and faced frustration dealing with unreasonable homeowners. So it makes sense that some local window contractors can be choosy about with whom they do business.

    There are some ways you can encourage good window contractors in Sonoma County to want your job.

    • Look for good value, not just the lowest price. The first question most homeowners ask contractors is about price, so it’s important to show them you understand the importance of quality products, knowledgeable installation and long-term value.
    • Be upfront if you’re interviewing other window contractors, but assure the contractors you’re accepting three bids, not dozens.
    • Shop among local window contractors in Sonoma County. Most like to work in the local area, as it allows them to provide better service in a more timely fashion. It also shows the contractors you’re not looking for cheap windows, as some fly-by-night contractors travel long distances to install discounted 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 Sonoma County
    You’ve finally found the perfect Sonoma County window contractor that meets all your requirements. Now is the time to ask for a contract that includes written confirmation of price, quality and installation details. They should also be willing to provide you with a written timeline that includes the job start date, major milestones and intended completion date.

    Read the entire contract and understand all the terms before signing it. The contract you sign with a Sonoma County window company should protect you and your property as well as your contractor’s interests. For this reason, never sign a blank or incomplete estimate.

    Don’t be afraid to write in requests or verbal agreements you’ve made with your representative. For instance, start and end dates are important, but there are factors neither you nor your installer can control. That’s why it’s smart 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 product delays hold up the work, such a clause will give you assurance that your job will be finished on time. If a quick turnaround is important to you, you may want to consider adding a bonus for early completion to your contract as well.

    Confirm any warranties at this time, as some window installers in Sonoma County only guarantee certain brands or installation techniques. Also verify that manufacturer warranties apply to the windows you’re having installed.

    Don’t forget about related issues that may not be covered by a standard contract. For example, regardless of how careful your window installer promises to be, crushed flowers, damaged shrubs and rutted lawns are often unexpected hazards that come with hiring a window contractor in Sonoma 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 your landscaping and property before the work begins, and talk with your contractor about reasonable expectations for protecting your home and yard during the window installation process. When you’ve reached an agreement, both you and the contractor should sign and date the document. After the work is done, do a final inspection together to confirm your expectations were met.

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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 Sonoma County window contractor.

    • Be clear and upfront with the window contractor or window company representative. Let them know what you want from your windows, the long-term outcome you’re expecting and specific ways they can satisfy your expectations.
    • Before you hire a window contractor in Sonoma County, restate to the window company representative your expectations and goals, and reiterate your understanding of the agreement. Most problems with local window contractors occur because of a breakdown in communication. 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. This will help eliminate the possibility that you feel ignored or that your contractor isn’t communicating well with you.
    • Be sure your service representative has a phone number where they can reach you at all times while they’re installing your new windows. The work 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 punctually to keep the window installation on schedule.
    • Pay for the new windows and installation work promptly.
    • Remember, a friendly smile goes a long way!

    Why would you want to be a good customer? Window installation contractors in Sonoma 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 more easily resolved.

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Check The Work
Check the New Window Installation

When the work is completed, most good window contractors in Sonoma County will give you a written invoice that details all the work done. This invoice usually includes:

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

It’s smart to compare the work that was actually done to the written invoice. Ask your window company representative to accompany you on a walk through the job site and show you the window repairs or new window installations. Check this work point by point against the invoice. During your walk-through, ask if there are any special instructions for operating your new windows and the best steps to take in maintaining them. 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 Sonoma County Window Installers for Written Warranties

Confirm your warranties before the Sonoma County window contractors leave the jobsite. Not all window companies in Sonoma County 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.
  • What products and work are covered, including whether the contractor will replace or repair your windows or give you a refund if you have to place a warranty claim.
  • 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).
  • Terms of and limitations on the new window warranty.
  • If the new window warranty coverage is transferable to the new owner if you sell your home.
  • Any exclusions must be in writing.
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Top 10 Requests
Homeowners’ Top Requests for Sonoma County Window Contractors

The top requests for new and replacement windows listed below are available from local window contractors in Sonoma County. Read the paragraphs below for details about each term.

New Windows
New windows are usually installed in new construction and remodels. They differ from replacement windows because new windows include the window frames and glass plates, and have a nailing fin along the outer frame. This allows window contractors to nail them in place from the outside of the home before siding or exterior trim is installed.

Replacement Windows
When old windows deteriorate, home replacement windows are often the solution to upgrade efficiency, security and appearance. Sonoma County window contractors usually install replacement windows in existing window spaces, using the existing trim, frames and cladding. Drop-in replacement windows are designed for minimal disruption of the existing structure and are often the least expensive option. Still, replacement windows can drastically improve the appearance and value of your home.

Window Repair
Window installers in Sonoma 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.

Vinyl Windows
Vinyl windows are a favorite of Sonoma County homeowners in Santa Rosa, Rohnert Park, Guerneville and other cities because they are inexpensive, durable, energy efficient and nearly maintenance-free.

Double-Hung Windows
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. Most double-hung windows are energy efficient, keeping out hot and cold air and maintaining a comfortable temperature inside.

Storm Windows
Storm windows are glass panel windows affixed to existing windows to increase energy efficiency and block out inclement or rainy weather. Storm windows can be permanent windows or temporary windows that are mounted externally or internally to existing windows.

Bay Windows / Bow Windows
Bay windows are popular requests in Sonoma 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.

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.

Aluminum Windows
Strong, durable and easy-to-configure, aluminum windows are often chosen to showcase beautiful views. Aluminum windows are also a less-expensive option in homes and light commercial buildings, and they generally require less upkeep than other windows. Aluminum windows are not traditionally the most efficient, but more recent aluminum windows are more energy efficient than previous designs.

Most Commonly Requested Window Manufacturers
Many window installers in Sonoma County have preferred window brands they sell and install, including these popular window brands

Pella Windows
For more than 85 years, Pella Windows has been making and installing windows for homes and businesses. Home window styles available from Pella include casement windows, awning windows, double-hung windows, single-hung windows , sliding windows, bay/bow windows and specially-shaped custom 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 Sonoma County offer replacement windows in a full range of materials and styles. Vinyl, aluminum, wood and composite windows are all available from Andersen Window dealers.

Marvin Windows
From energy efficient to fully customized designs, Marvin Windows is one of the most recognized window manufacturers. Marvin Authorized Installing Retailers in Sonoma 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 Sonoma County from Milgard.

Simonton Windows
Some window contractors in Sonoma County install new construction and replacement windows by Simonton Windows. These include casement windows, radius windows, single hung windows, awning windows, double-hung windows, garden windows and single slider windows. Simonton manufactures windows in aluminum, wood, composite and vinyl.

PGT Windows
PGT Windows are custom impact-resistant windows meant to increase the style, safety and security of your home. Available windows include new construction and replacement windows with aluminum and vinyl frames. PPG also manufactures hurricane windows.

Kolbe Windows
New construction windows, replacement windows, historic home windows, custom windows and commercial windows are all available in Sonoma County from Kolbe Windows and Doors.

CertainTeed Windows
All standard and custom home windows are available in Sonoma County from CertainTeed Windows. CertainTeed was one of the first window manufacturers to offer vinyl windows. They also offer energy efficient, Low-E glazed windows.

Loewen Windows
Loewen Windows exclusively manufactures wooden windows, including wood awning windows, wood casement and double-hung windows, picture windows, wooden access windows, transoms and other custom wood window designs. Loewen wooden windows are made from Douglas Fir and Mahogany woods.

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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 that have passed the country’s most in-depth rating process. Only window companies rated Highest in Quality and Helpful Expertise® 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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