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  • Accurate Ratings

    Local companies rated
    Highest in Quality and Helpful Expertise®

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    Backed by Mediation

  • Deep Info™

    Researched company reports.
    Essential articles and videos by topic experts.

LOCAL CONSUMERS AND COMPANIES RELY ON THE DIAMOND CERTIFIED RESOURCE

Barbara Schallau Consumer
Bay Area

Hany Louis CEO/General Manager
The Tile & Grout King Inc.

Jagdish Hegde Consumer
Fremont

Leigh Bakhtiari President
City Carpets

Cecile Monfort Consumer
San Jose

Mark Corrallo President
All Seasons Construction

Jim Baylor Consumer
Bay Area

Bev Oliver Consumer
Bay Area

Gifford Teeple Owner
A Reliable Handyman

Tami Aviles Consumer
Bay Area

Tommy Herren Owner
The Lighting Geek

BROWSE BY MAJOR CATEGORIES
WHY CHOOSE A DIAMOND CERTIFIED COMPANY?
Watch this video on the Diamond Certified Resource: the most accurate and trustworthy way to find local companies rated Highest in Quality and Helpful Expertise®.
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We’ve all felt the joy of choosing a good local company and, unfortunately, the pain when we mistakenly choose a bad one. The problem is, every company claims to be good, yet despite these glowing claims some provide inconsistent quality while others are downright unscrupulous.

We’ve solved this problem for you with the Diamond Certified Resource. Only local companies independently rated Highest in Quality and Helpful Expertise® earn Diamond Certified. Our rigorous rating and certification process starts with the in-depth pass/fail rating of each company’s customer satisfaction, license and insurances. Most companies can’t pass our rating and earn Diamond Certified, and every Diamond Certified company must continue to deliver on its promises to you, the consumer. That’s why we conduct ongoing customer satisfaction research and credential-based ratings and monitor each company’s performance.

Every Diamond Certified company is backed by our powerful Performance Guarantee, so you’ll feel confident in your choice when you use our always-free web resource or Diamond Certified Directory. If you try unsuccessfully to resolve a disagreement with a Diamond Certified company, our mediator will work with you and the company to attempt to reach an agreement that both parties can live with. If the mediation fails to produce a mutually agreeable solution due to failure of the Diamond Certified company to honor contractual obligations, uphold industry standards or participate in good faith, we will refund your purchase price up to $1,000.

Each time you visit diamondcertified.org, you’ll see each Diamond Certified company’s Deep Info, including researched company rating reports, verbatim survey responses, essential articles, photo galleries, videos and expert tips. We put all the information you need to choose a company in one place, and no other web page can match this depth of information.

When you choose a Diamond Certified company, you’ll never be fooled by fake or cherry-picked reviews because we survey a large, random sample of each company’s customers by telephone (typically 100 surveys) to get the most accurate ratings and verify only real customers are responding. Company owners can’t cherry-pick by telling friends and selected customers to post 5-star reviews on our site—we don’t allow it.

So, if you want quality, you’ll have confidence in choosing a Diamond Certified company. We encourage you to visit this website on a regular basis to find updated ratings on top rated companies in your area, see verbatim survey responses on each Diamond Certified company, and read thousands of industry-specific expert articles and tips. We care about customer satisfaction, and we care about you. We’re proud to give you all the information you need to choose with confidence.

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WHAT’S IN EACH DIAMOND CERTIFIED COMPANY REPORT?
SAMPLE COMPANY REPORT

Each Diamond Certified Company Report gives you the most accurate and comprehensive Deep Info available for each company. It includes proof of Diamond Certified status, rating charts, verbatim survey responses, essential articles about the company, a capabilities table, a Diamond Certified Video Profile, key photos, company owner expert tip contributions and more. Click on the graphic to learn more

  • ACCURATE RATINGS

    We survey a large, random sample of each company’s customers by telephone to get the most accurate ratings...

    VERBATIM SURVEY RESPONSES

    In addition to providing rating scores for Quality, Intent to Return and Helpful Expertise®, each surveyed customer is...

    VIDEO PROFILE

    You get to see the company in action, meet the managers, and learn as they describe their specialties and customer...

    ESSENTIAL ARTICLES

    You can choose to scan or go deep into these five researched articles on each Diamond Certified company: Company...

    CAPABILITIES TABLE

    Each company’s key info is logically organized within this table. You’ll find this system of display gives...

    TOPIC-BASED EXPERT CONTRIBUTIONS

    Top rated local company owners are experts in their fields, and they’ve written topic-based expert articles and created...

    PHOTO GALLERY

    If a picture is worth a thousand words, how about an entire portfolio? You’ll get a better sense of each company once...

    COMPANY WEBSITE & EXTERNAL FEED

    This is a good place to go if you want to do extra research on a company. Here you’ll find a link to each company’s...

DIAMOND CERTIFIED CONSUMER INFORMATION AND RESOURCES
DIAMOND CERTIFIED BLOG
Video: Maintaining Your Shocks

Posted on February 14, 2019 by James Florence

Earlier this week, we posted an article featuring expert auto care tips from industry professionals. One of the aspects mentioned was the maintenance of shocks—a crucial yet often-overlooked vehicle component. To learn what makes shock maintenance so important, watch this video by Diamond Certified Expert Contributor Walee Gon, owner of Faxon Garage in San Francisco.

 

 

 

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Posted in: Automotive, Auto Tips, Diamond Certified Experts
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Diamond Certified Experts: Often-Overlooked Aspects of Auto Maintenance

Posted on February 12, 2019 by James Florence

As a vehicle owner, you’re likely familiar with routine maintenance tasks like oil changes and tire rotation. However, there are many lesser-known aspects of vehicle maintenance you may not be aware of. To expand your knowledge, we asked five Diamond Certified Expert Contributors to address some often-overlooked vehicle components and their maintenance needs. Read more

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Posted in: Automotive, Auto Tips, Diamond Certified Experts
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Should You Hire a Handyman?

Posted on February 07, 2019 by James Florence

When you need work done on your home, it’s not always easy to know who you should call. In some cases, a general contractor might be the right choice, while others may call for a trade specialist like a plumber or an electrician. However, there’s another type of service provider that’s sometimes overlooked: the handyman. Read more

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Posted in: Home Maintenance
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LATEST PHONE SURVEY RESPONSES FROM VERIFIED CUSTOMERS
  • Douglas G.

    Verified customer
    Quality 10
    Loyalty Yes
    Helpful expertise Yes
    Critique

    They're very professional and very quick. They do excellent work. Everything by the book. They don't cut corners.
    Their quickness was great. They got to the jobsite and got it done in record time. It was good.

  • Tracy B.

    Verified customer
    Quality 10
    Loyalty Yes
    Helpful expertise Yes
    Critique

    I think they're great professionals and they have a great small company feeling but with big company resources.
    I think the design team was fantastic and also their maintenance team was really good as well.

    Response to Diamond Certified Company Hawkins Enterprises, Inc.

THIS WEEK’S FEATURED DIAMOND CERTIFIED EXPERT CONTRIBUTIONS

Duane Vos is CEO of Creative Window Fashions, Inc., a Diamond Certified company since 2011. He can be reached at (415) 935-0986 or by email.

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Duane Vos: Blind Ambition

By James Florence, Diamond Certified Resource Reporter

ROHNERT PARK — When Duane Vos started installing window blinds as a young man, he had no idea it would lead to a full-fledged career. “My dad owned a flooring and decorating store in Parker, Arizona, where they sold window coverings but didn’t install them,” he remembers. “He was also into cars and was paying me to restore a ’59 El Camino in the shop behind the store. One night, his manager told me he’d been installing blinds after work for the last 15 years and asked if I was interested in taking over for him. At $15 per blind, Read more

Expert tip
The Value of Window Shutters
ROHNERT PARK – When it comes to selecting new window treatments, today’s homeowners have numerous options. However, out of the many choices available, only one will substantially add to the value of a home: shutters. Once they’re installed,… Read more

Francisco Cortes is president of Green Environment Landscape, Inc., a Diamond Certified company. He can be reached at (408) 372-7932 or by email.

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Francisco Cortes: Always Growing

By James Florence, Diamond Certified Resource Reporter

WATSONVILLE — After embarking on a career in landscaping, Francisco Cortes charted a professional path marked by continual growth and development. “Before I got into landscaping, I was working in a warehouse and wanted a job where I could work outside,” he remembers. “A friend suggested becoming a landscaper, and after looking into it, I decided to give it a shot. I really enjoyed landscaping work and decided to take some college courses to learn about landscape design and irrigation. Several years later, I became interested in hardscaping, so I joined the California Landscape Contractors Association so I could learn more about that aspect. Read more

Expert tip
3 Tips to Conserve Water in Your Yard
WATSONVILLE — When it comes to irrigating your yard, small steps and smart practices can go a long way toward conserving water. Consider the following tips: Water less often for longer intervals. Many people water their lawns and gardens every… Read more

Daniel Gagne is a lifetime veteran of the plumbing industry and owner of Benjamin Franklin Plumbing, a Diamond Certified company. He can be reached at (415) 788-4357 or by email.

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Daniel Gagne: Plumbing Pride

By James Florence, Diamond Certified Resource Reporter

NOVATO — When Daniel Gagne began his plumbing career, he had no idea of the level of success he’d one day attain. “My dad was a plumber, so I was introduced to the trade at a very young age,” he recounts. “After high school, I worked for the family business for a while, and after doing some traveling in my 20s, I ended up in Marin County, where I got a job with a local plumbing company. In 1996, my brother and I co-founded our own plumbing business, which focused on new construction and remodeling work in Marin, Napa, and Sonoma Counties.”

Three years into their joint venture, Read more

Expert tip
DIY Water Heater Maintenance
NOVATO — A crucial aspect of plumbing system maintenance is to drain your water heater’s tank at least once a year. This is important because of all the sediment in the water, which tends to collect and sit at the… Read more

Bo Posey is a lifetime veteran of the automotive industry and president of Metric Motors, a Diamond Certified company. He can be reached at (707) 206-7356 or by email.

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Bo Posey: An Early Fascination

By James Florence, Diamond Certified Resource Reporter

SONOMA — Even from a young age, Bo Posey seemed destined for a career in the automotive industry. “My dad was a machinist and always did his own car maintenance, so I was introduced to automotive work early on,” he recounts. “I’ve always been fascinated by cars. Even before I started working on real ones, I was fixing remote-controlled cars for kids in my neighborhood.”

As soon as he was of age, Bo dove headfirst into a professional automotive career. “Right out of high school, I began working as a mechanic for a trucking company, maintaining and repairing big rigs. Read more

Expert tip
Turbocharged Engines: What You Need to Know
SONOMA — In recent years, more and more vehicle manufacturers are incorporating turbocharger technology into their engine designs. A turbocharger utilizes exhaust gas to pressurize the air inside the engine, which enables the engine to take in more fuel. With… Read more

Agapito Chavez-Reyes is owner of PRI-Premiere Roofing Inc., a Diamond Certified company. He can be reached at (925) 453-6240 or by email.

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Agapito Chavez-Reyes: Life on the Roof

By James Florence, Diamond Certified Resource Reporter

LIVERMORE — Most people work a few different jobs before discovering their permanent livelihood, but for Agapito Chavez-Reyes, roofing is the only job he’s ever had. “I got into roofing at age 15, right after I first came to the U.S.,” he remembers. “I started out cleaning jobsites and carrying materials for the roofers, and I gradually worked my way up through the ranks. Several years in, while working as an officer for a roofing company, I encountered a situation where we neglected to do something for the client, but since I wasn’t the owner, I didn’t have the power to make it right. Read more

Expert tip
Attic Ventilation and Roof Lifespan
LIVERMORE — When it comes to roof replacement, one aspect that’s often overlooked is attic ventilation. While not as well-known as other roof components like shingles, attic ventilation is nonetheless crucial to ensure a roof reaches its maximum… Read more

Jeff Kendall is president of Custom Exteriors, Inc., a Diamond Certified company. He can be reached at (877) 312-3507 or by email.

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Jeff Kendall: A Customized Career

By James Florence, Diamond Certified Resource Reporter

PLEASANTON — Since taking his first sales job, Jeff Kendall has spent the subsequent decades customizing his career. “I’ve been doing sales since I graduated college,” he recounts. “I’ve always loved meeting and talking with people, and I appreciate not being stuck in an office all day. After working as a Yellow Pages salesman for a few years, I got a job as a window and siding sales estimator at Sears. It was there that I met Kevin Gundry, who is now co-owner of Custom Exteriors. Later, while working for a Bay Area home exterior company, I got a call from Kevin, Read more

Expert tip
Permits: An Important Consideration When Hiring a Contractor
PLEASANTON — Before hiring a contractor to replace your home’s windows, siding or stucco, make sure they’re willing and able to handle building permits. The permitting process for exterior renovations can be quite daunting—there are Title 24 questions, floor plan… Read more

Grayeagle Porter is a design consultant at Custom Exteriors, Inc., a Diamond Certified company. He can be reached at (877) 312-3507 or by email.

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Grayeagle Porter: An Unforeseen Trajectory

By James Florence, Diamond Certified Resource Reporter

PLEASANTON — As a young man, Grayeagle Porter could never have foreseen the unique course his professional path would take. One thing is for sure: he wouldn’t change a thing about it. “I actually began my career in the theater,” he recounts. “I got my degree in dramatic arts and acted professionally for about 10 years. After getting married, I needed higher-paying work, so I got into the hospitality industry and worked in hotels and restaurants. During this time, I was approached by the owner of a window company, who told me I’d be really good at selling windows. Read more

Expert tip
3 Window Styles
PLEASANTON — When installing new windows, it can be difficult to decide which style will work best for your home. To make an informed decision, consider the following window styles and their attributes: Vinyl The quality of vinyl windows has… Read more

David Lopez is sales manager of Custom Exteriors, Inc., a Diamond Certified company. He can be reached at (877) 312-3507 or by email.

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David Lopez: A Grounded Career

By James Florence, Diamond Certified Resource Reporter

PLEASANTON — After joining the United States Air Force, David Lopez figured he’d spend the rest of his life soaring through the skies. In the end, he found satisfaction in a more grounded career. “Out of high school, I joined the Air Force and served four years as a crew chief on an A-10 Thunderbolt,” he recounts. “After I got out, my plan was to become a pilot for United Airlines. Between moving back to California from my Air Force base in Tucson, I made a friend who was in the construction business. I started working with him and I enjoyed it, Read more

Expert tip
Benefits of a Fiberglass Entry Door
PLEASANTON — When choosing a new entry door for your home, it’s worthwhile to consider the many benefits a fiberglass door provides: Performance Wood entry doors expand and contract with changes in weather, which can cause issues like sticking or… Read more

Marc Roos works in partnership with Sereno Group to help clients buy and sell properties in Santa Clara County and parts of San Mateo County. He can be reached at (650) 207-0226 or by email.

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Marc Roos: A Residential Affinity

By James Florence, Diamond Certified Resource Reporter

When Marc Roos got his first job in the real estate industry, he didn’t know it would be a stepping stone toward a successful long-term career. “I got into real estate by accident, really,” he says. “After college, a friend and I were looking for work, so we went to the campus employment center. One of the job ads was placed by a commercial real estate broker who was looking to drum up sales; we both responded and were hired. From there, my friend went on to pursue a career in commercial real estate, but I was much more interested in the residential side. Read more

Expert tip
4 Tips for Staging Your Home
LOS ALTOS HILLS — When selling your home, you can increase its appeal to potential buyers by staging it. Staging is a common real estate sales technique for enhancing a property’s visual attractiveness. Essentially, you want your sale property to… Read more

Sean Mader is co-owner of Atticare, a Diamond Certified company. He can be reached at (408) 758-5718 or by email.

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Sean Mader: One for All

By James Florence, Diamond Certified Resource Reporter

SAN LEANDRO — When asked the secret to his success with Atticare, Sean Mader credits a trifecta of unique talents contributed by the company’s three owners. “Atticare is owned and operated by Zack, Scott and myself—all good friends who served together in the Israeli military,” he explains. “We share a similar perspective on operations and our goals for the company, but each of us brings a unique set of skills to the table. Zack is a natural strategist who makes sure we stay ahead of the competition; Scott specializes in systems and operations; and I focus on marketing, customer service and business relations. Read more

Expert tip
4 Reasons to Inspect and Upgrade Your Attic
SAN LEANDRO — Even if you don’t spend much time in your attic, you shouldn’t neglect this area of your home. At least once a year, you should inspect your attic for potential issues. Furthermore, if your attic isn’t thermally… Read more

Alex Rodriguez is owner of A-Rod Auto Collision, a Diamond Certified company. He can be reached at (408) 622-0473 or by email.

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Alex Rodriguez: A Family Operation

By James Florence, Diamond Certified Resource Reporter

SAN JOSE — For years, Alex Rodriguez and his family had talked about starting an automotive business. Finally, by aligning their skills and resources, they successfully followed through with their dream. “I come from a big family, and we’ve always worked on each other’s cars,” explains Alex. “A few of my relatives have professional auto body experience and we’d often talk about starting our own business. After working for 34 years as a construction equipment operator, I was getting ready to retire and I had the money to purchase a business, so we all decided it was time to make it happen.”

Since founding A-Rod Auto Collision in San Jose in 2016, Read more

Expert tip
How to Assess a Scratch on Your Vehicle
SAN JOSE — If there’s a scratch on your vehicle’s body, you may assume the area will need to be repainted. However, this may not be the case. Vehicle body scratches often look similar, but their impact can vary substantially… Read more

Jim Gardner is owner of Jim Gardner Construction Inc., a Diamond Certified company. He can be reached at (510) 254-5887 or by email.

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Jim Gardner: A Sound Structure

By James Florence, Diamond Certified Resource Reporter

OAKLAND — After more than 20 years doing structural work, Jim Gardner has established himself as an expert in his field. However, the foundation of his professional expertise didn’t form overnight; rather, it was something he built up gradually. “After college, I wasn’t sure what I wanted to do, so I worked a bunch of different jobs, including firefighter, swim instructor and river rafting guide,” he recounts. “When my mother moved to the Bay Area from Southern California and bought a house, I offered to fix it up for her. I’ve always been handy, but I’d never done any real construction work at that point, Read more

Expert tip
Solutions for Drainage Problems
OAKLAND — When it comes to drainage, most homeowners don’t realize there are two different types of water that need to be addressed: surface water and subterranean water (also known as groundwater). Furthermore, these two types of water each require… Read more