The Certification Process






    (800) 555-1212


    [email protected]



  • Benefits
    • Upgrades to Reduce Your Home’s
    • Upgrades to Reduce Your Home’s
    • Upgrades to Reduce Your Home’s
  • Sign Up
  • Accurate Ratings

    Local companies rated
    Highest in Quality and Helpful Expertise™

  • Performance Guaranteed

    We're local and here to help
    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...

The 2018 Diamond Certified Directory is Coming!

Posted on March 20, 2018 by Matt Solis

The 2018 Diamond Certified Directory is in the final stages of production, which means printing is just around the corner! More than 800,000 copies of the Directory will be sent to homes and businesses throughout the Greater Bay Area. Each Diamond Certified company is presented with a full-page profile that includes:

  • Contact information (address, phone number, website, email)
  • Services and service areas
  • Business profile and philosophy
  • Verbatim survey responses from real, verified customers
  • In-depth ratings information, including customer loyalty and customer satisfaction rankings
  • Legal information (insurance coverage, California business license)
  • Read more

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Posted in: Consumer News, Consumers, Diamond Certified News
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Video: How to Attach a Deck to a House

Posted on March 15, 2018 by James Florence

Earlier this week, we posted an article featuring expert tips on building a new deck. One of these tips expressed the importance of proper waterproofing when attaching a deck to a house. To learn about this process in greater detail, watch this informative video by Steve Labourdette of Labourdette Construction.

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Posted in: Decks and Patios, Diamond Certified Experts
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Diamond Certified Experts: Deck Construction 101

Posted on March 13, 2018 by James Florence

Few things can augment a home’s livability like the addition of a deck. This is especially true in the Bay Area, where the prevalence of warm, sunny weather can translate to many hours of outdoor enjoyment. If you’re thinking about adding a deck to your home, it’s a good idea to learn about the process so you can make educated choices. To help you do this, we’ve asked four Diamond Certified Expert Contributors to share their insights on deck construction. Read more

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Posted in: Decks and Patios, Diamond Certified Experts
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Do Fence Me In: Why Every Home Needs a Good Fence

Posted on March 08, 2018 by Suzanne Carroll

For many folks in the Bay Area, the busiest room in the house is…the backyard. Grilling, playing and socializing outdoors puts neighbors in closer contact with each other, and while that can certainly lead to friendships, it can also cause friction. But you know what they say, good fences make good neighbors. This article covers why you might choose to invest in a high-quality fence and what options are best for your type of yard. Read more

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Posted in: Hardscaping, Home Improvement
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  • Ryan B.

    Verified customer
    Quality 10
    Loyalty Yes
    Helpful expertise Yes

    I feel confident in their work.
    They are very professional. They are also friendly and have time to talk.

    Response to Diamond Certified Company Mark's Transmission Service

  • Doug G.

    Verified customer
    Quality 10
    Loyalty Yes
    Helpful expertise Yes

    I have told many that it is personable, professional, and I have used them almost about a dozen times and they have always been a '10' out of '10'.
    The crews who moved me were consistent, and more often than not, Mike and his crew have come out. They are as friendly and professional as you can get.

    Response to Diamond Certified Company A and P Moving, Inc.


Charlie Judson is a 34-year veteran of the water treatment industry and president of Weeks Drilling & Pump Company, a Diamond Certified company since 2004. He can be reached at (707) 823-3184 or [email protected]


Charlie Judson: A Life Well Spent

By Matt Solis, Diamond Certified Resource Reporter

SEBASTOPOL – Charlie Judson didn’t expect to find a career in water treatment when he was a young geology student at Santa Rosa Junior College—like many students, he was simply looking for a way to make some extra money when he stumbled upon an industry that would eventually become his life’s work. “I answered an ad for a company that was looking for someone to install water filters, which I had some experience with, and I ended up working there for a couple years and learning the basics of the business,” he remembers. “I found the water quality part of the job extremely interesting and challenging, Read more

Expert tip
How To Tell If Your Well Water is Safe
SEBASTOPOL — If your water is supplied by a well, there are some basic health and safety issues you need to be aware of. First and foremost, the only way to know that your water is truly safe is… Read more

Greg Severs is president of S & S Painting and Coatings, Inc., a Diamond Certified company. He can be reached at (510) 210-0492 or by email.


Greg Severs: Painting His Way

By James Florence, Diamond Certified Resource Reporter

CASTRO VALLEY — After painting his way through high school and college, Greg Severs figured it only made sense to keep going. “I started painting during the summers in high school and continued to paint part-time during college,” he recounts. “My goal after college was to start my own business, and since I knew painting, I decided it might as well be a painting business. My twin brother was also a painter, so we decided to join forces and started S & S Painting and Coatings in 1978. Shortly after, he left the country to play professional basketball in Europe, Read more

Expert tip
A Coating for Worn Exterior Siding
CASTRO VALLEY — When preparing for an exterior painting project, it’s important to inspect the condition of your siding. Particularly on the southern and western exposed elevations, standard plywood siding commonly sustains splits and cracks (known as “face-checking”), which is… Read more

Joshua Rengifo is vice president of Joshua’s Moving & Packing Services, LLC, a Diamond Certified company. He can be reached at (650) 557-3758 or by email.


Joshua Rengifo: Making His Move

By James Florence, Diamond Certified Resource Reporter

SAN CARLOS — Joshua Rengifo had been in the moving business for several years when he made the move to start his own company. “I’ve been a mover for more than 18 years,” he says. “I started out working for Irish moving companies in the East Bay and San Francisco. When my wife and I started having kids, I knew I’d need a boost in my salary to support my family, so I decided to start my own moving business. At first, I didn’t even have my own truck—I had to rent one! However, after a few years, the company really started to grow. Read more

Expert tip
How to Pack Furniture for Moving
SAN CARLOS — Prior to moving a piece of furniture, take steps to protect it from damage during transit. First, remove any detachable parts, such as table leaves and chair legs, and wrap these separately. If you feel so inclined,… Read more

Gregg Campbell is owner of B & L Glass Company, a Diamond Certified company since 2006. He can be reached at (707) 546-4143 or by email.


Gregg Campbell: Career Transparency

By James Florence, Diamond Certified Resource Reporter

SANTA ROSA — After being hired by a glass company to do systems and accounting, the last thing Gregg Campbell expected was to one day own the business. “I was hired by the previous owners of B & L Glass Company to set up their computer systems and accounting software, which led to a full-time position handling their accounting,” he remembers. “When things slowed down in the early ’90s, they had to lay me off, but they continued to use me as a consultant. In 1999, I received a call from my friend, Phil, an employee at the company, who asked if I’d be interested in teaming up with him to purchase the business from the owners. Read more

Expert tip
Dealing with Failed Insulated Glass
SANTA ROSA — If you have a window in your home that seems to be perpetually fogged up, you might be confused about what’s causing this. In actuality, this is a common occurrence with dual-pane windows, and while it can’t… Read more