The Certification Process






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  • Accurate Ratings

    Local companies rated
    Highest in Quality and Helpful Expertise™

  • Performance Guaranteed

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    you, backing you up if needed.

  • Deep Info™

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


Barbara Schallau Consumer
Bay Area

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

Jagdish Hegde Consumer

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

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.

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, 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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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


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


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


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


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


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


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


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


    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...

Radical Gratitude & Giving Thanks

Posted on November 21, 2017 by Jennifer Chan

“Radical gratitude is about cultivating the ability to hold a paradox. We can both feel the deep pain of grief, loss, and tragedy and be grateful for the ways in which such experiences crack us open, shatter the illusions of the ego, and wake us up to the truth of being.” —Lissa Rankin, M.D.

It’s November and we’re thinking about gratitude, even more so than usual this time of year. In the last few months, we witnessed a seemingly endless series of natural disasters, from hurricanes and earthquakes to devastating fires right here in the Bay Area. Recovery will take time, patience and resources. It’s all hands on deck for those who have been immediately affected by disaster and those on the periphery who want to help. Read more

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Posted in: Personal Stories

Diamond Certified Experts: Installing New Windows

Posted on November 14, 2017 by James Florence

Every home has windows, but not all windows provide an equivalent level of performance. That’s why upgrading to quality windows can have a significant impact on a home’s energy efficiency and comfort level. However, when it comes to installing new windows and frames, there are several details to consider. To gain some clarity on the process, we’ve asked six Diamond Certified Expert Contributors to provide their professional insights. Read more

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Posted in: Windows, Diamond Certified Experts
Tags: , , , , , ,

Industry Spotlight: North American Technician Excellence (NATE)

Posted on November 09, 2017 by Suzanne Carroll

NATE logoHistory

In the 1990s, many industry leaders in the heating and air conditioning field noticed a problem. Equipment manufacturers were producing more advanced machines, but clients were frequently dissatisfied with them. Companies were spending more resources on customer service, recurring callbacks and handling costly returns. Manufacturers and contractors realized the technicians working on these systems often didn’t have the necessary education or training to service them properly. To address this problem, the Air-Conditioning, Heating & Refrigeration Institute (AHRI) and the Gas Appliance Manufacturers Association (GAMA) formed North American Technician Excellence (NATE), a nonprofit certification program for technicians working in heating, ventilation, air conditioning and refrigeration (HVACR).

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Posted in: Industry Organization Spotlight

The 2017 Fall Diamond Certified Directory Update is Here!

Posted on November 07, 2017 by Matt Solis

Have you received your free copy of the 2017 Fall Diamond Certified Directory Update in the mail? It provides instant access to hundreds of local, top rated Diamond Certified companies across a wide range of service industries, from auto repair and landscaping to optometry and dentistry.

Every Diamond Certified company must continue to deliver on its promises to you, the consumer. That’s why we conduct ongoing customer satisfaction research, perform credential-based ratings, monitor each company’s performance, and back you up with mediation and the Diamond Certified Performance Guarantee. Read more

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Posted in: Consumer News, Diamond Certified News
Tags: , , , , ,

  • Mike J.

    Verified customer
    Quality 10
    Loyalty Yes
    Helpful expertise Yes

    They were on time, they cleaned up after themselves well, and they were very professional.
    I would say I liked the communication between the salespeople, workers, and myself. They always kept everyone in the loop.

    Response to Diamond Certified Company Roofmasters / Bird Control Services

  • Anne M.

    Verified customer
    Quality 10
    Loyalty Yes
    Helpful expertise Yes

    They were very professional, pleasant, and very considerate.
    They were very professional, considerate, and very pleasant.

    Response to Diamond Certified Company You Move Me


Calvin Hoang is owner of C H Hardwood Floors, a Diamond Certified company since 2011. He can be reached at (408) 785-9860 or by email.


Calvin Hoang: From High-Tech to Hardwood

By James Florence, Senior Writer

Calvin Hoang spent a long time aiming for a high-tech career, but he ultimately landed a more hands-on livelihood. “My father is a hardwood flooring professional, and I started working for him on the side while attending college,” he recounts. “After earning my degree in computer technology, I got a job in the high-tech industry but ended up being laid off. I returned to school, this time to pursue a degree in technical management, and also went back to working for my dad. After earning my second degree, I tried to get another high-tech job, but there was a lot of competition. Read more

Expert tip
The Long-Term Advantages of Solid Hardwood Floors
SAN JOSE — A commonly asked question about hardwood flooring is whether solid or engineered wood is a better choice. Each has its advantages—solid hardwood is durable and allows for customized color and design, while engineered hardwood is affordable, easy… Read more

Paul Jancis is a 15-year veteran of the automotive industry and owner of Driven Auto Care, a Diamond Certified company since 2008. He can be reached at (650) 530-0933 or by email.


Paul Jancis: Shifting Gears

By James Florence, Diamond Certified Resource Reporter

MOUNTAIN VIEW — When asked how he got into the automotive field, Paul Jancis says it was anything but a gradual transition—more like an abrupt shifting of gears. “Basically, I had an early midlife crisis,” he explains. “I was in restaurant management and I wasn’t happy, so I did some soul searching and asked myself, ‘What do I really want to do with my life?’ I’d always been mechanically inclined and had a strong interest in cars, so I figured automotive work might be a good option. I didn’t have any experience, but I knew it was something I’d enjoy, Read more

Expert tip
The Importance of Manufacturer-Recommended Maintenance
MOUNTAIN VIEW — As vehicles get more expensive, it’s becoming more common for owners to keep their cars for longer periods of time. However, if you want your car to be reliable for the long term, you’ll need to be… Read more

Joe Stefani is estimator at Shelton Roofing Co., Inc., a Diamond Certified company since 2002. He can be reached at (650) 898-7900 or by email.


Joe Stefani: Switching Gears

By James Florence, Diamond Certified Resource Reporter

MOUNTAIN VIEW — After spending his early career beneath the hood of a car, Joe Stefani decided to switch gears entirely and start working on rooftops. “Growing up, I had uncles who were in construction and roofing, but my passion was cars,” he remembers. “After high school, I started working as an auto mechanic, became a service estimator, and eventually got into RV repair and sales. At a certain point, I felt like I needed a change, so I decided to become a roofer. I didn’t have much experience, but it seemed like a good trade and it paid well, Read more

Expert tip
Annual Roof Maintenance
MOUNTAIN VIEW — As autumn advances toward winter, it’s a good time to do some preventative roof maintenance in anticipation of the rainy season. Start by clearing leaves, tree branches and other debris off of your roof, paying special attention… Read more

Joel Ramos Diaz is owner of American Canyon Collision Center, a Diamond Certified company since 2009. He can be reached at (707) 341-6953 or by email.


Joel Ramos Diaz: Body Art

By James Florence, Diamond Certified Resource Reporter

AMERICAN CANYON — Like his father before him, Joel Ramos Diaz decided to pursue a career in automotive work, but he found himself gravitating toward the more artistic side of the industry. “My dad was a mechanic, and growing up I always wanted to work in an auto shop,” he remembers. “My first job was as a detailer, and from there I jumped into body work, which is where I stayed. What I liked about body work was the visual nature of the finished product. As a mechanic, you can get a car’s engine running again, but when you do body work, Read more

Expert tip
Maintaining Your Car’s Headlights
AMERICAN CANYON — As the winter brings shorter days, it’s important to make sure your car’s headlights are in good operating condition. Over time, headlights can become foggy, which obscures the shine of the bulbs and reduces visibility while driving… Read more