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

Help us celebrate our new website!

Watch the short tour now and we’ll mail your family a FREE 2018 Diamond Certified Home Service Calendar. In addition, we will donate in your name to your local fire district.

1. Watch the video.
2. Click the button below.


  • 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.



Read moreRead Less

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 Winter Diamond Certified Directory Update Is Here!

Posted on January 16, 2018 by Suzanne Carroll

directory update cover winter 2018Have you received your free copy of the 2018 Winter 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 plumbing 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.

If you haven’t received your copy of the 2018 Winter Diamond Certified Directory Update, simply click here and we’ll send one as soon as possible. Read more

Leave a comment

Posted in: Diamond Certified News
Tags: ,

Diamond Certified Experts: Auto Body Care

Posted on January 09, 2018 by James Florence

For many people, a car represents more than a mere means of conveyance. It might be a status symbol, a passion project or simply the result of long-term hard work and frugality. If any of these applies to you, you’re likely as concerned about your car’s outward appearance as you are about its internal components, in which case you’ll want to know how to effectively maintain it. To that end, we’ve asked six Diamond Certified Expert Contributors to provide their auto body care tips. Read more

Leave a comment

Posted in: Automotive, Auto Tips, Diamond Certified Experts
Tags: , , , , , ,

2017 Alamo Bowl

Posted on January 04, 2018 by Jennifer Chan

Last week, TCU pulled off a huge comeback to defeat Stanford in the 2017 Alamo Bowl. Viewers throughout the Bay Area watched the real-time drama unfold, but exciting football isn’t all they saw—one of our Diamond Certified Resource television commercials ran during the broadcast. Here’s the commercial, and congratulations TCU! Read more

Leave a comment

Posted in: Press Releases

  • H. C.

    Verified customer
    Quality 10
    Loyalty Yes
    Helpful expertise Yes

    They do a good job. I don't know all the fine details, I'm just an admin here but, they were good.
    They fixed the problem from what I know.

    Response to Diamond Certified Company McLean & Williams, Inc.

  • Carolyn H.

    Verified customer
    Quality 10
    Loyalty Yes
    Helpful expertise Yes

    They were always on time, and they did what they said they would do. I wrote them a letter, because I was so pleased with the people they sent. I really felt that they went above and beyond, and they stayed longer than they originally planned to. They did a great job. They were really good.
    They were so professional, everything was nicely done, and they cleaned up after themselves. They were just wonderful. I've recommended them to a couple of people.

    Response to Diamond Certified Company Reyff Electric, Inc.


Luis Aviles is owner of Moving Forward, a Diamond Certified company. He can be reached at (415) 754-3925 or by email.


Luis Aviles: Moving Forward

By James Florence, Diamond Certified Resource Reporter

SAN FRANCISCO — For most people, the loss of a job would be considered a setback, but for Luis Aviles, it was just the nudge he needed to move his career forward. “I had been working for a local moving company for about a year when I was unexpectedly let go,” he recounts. “Instead of being discouraged, I actually felt empowered to go out on my own as an independent mover. I’d only been working in the industry for a year, but I’m a fast learner and felt I could definitely succeed. After doing some research about starting a business, Read more

Expert tip
3 Tips for Moving in San Francisco
SAN FRANCISCO — Moving is often a stressful undertaking, but when it comes to moving in San Francisco, the level of stress can be amplified. Fortunately, this doesn’t have to be the case: with proactive preparation, you can facilitate a… Read more

Gabi Rodas is owner of Construction Clean-up by Gabi, Inc., a Diamond Certified company. She can be reached at (415) 992-3026 or by email.


Gabi Rodas: A Helping Heart

By James Florence, Diamond Certified Resource Reporter

SAN RAFAEL — Gabi Rodas has always had a heart for helping others, so it only made sense for her to find a profession that allowed her to do just that. “My work isn’t just about making money, it’s about caring for others, which is very important to me,” she affirms. “After coming to the United States from Guatemala at the age of 17, I got my first job as a house cleaner, which I did for several years. Eventually, I decided to start my own business—something that would utilize my work experience but also allow me to make a positive impact. Read more

Expert tip
The Advantage of a Construction Clean-up Specialist
SAN RAFAEL — Remodeling your home can create a beautiful space, but it can also create a lot of dust in the process. Even when preventative measures are taken (such as putting up plastic barriers and using vacuum-equipped machinery), it’s… Read more

Darrell Wise is owner of Tree Wise, a Diamond Certified company. He can be reached at (925) 838-8733 or by email.


Darrell Wise: Out on a Limb

By James Florence, Diamond Certified Resource Reporter

DANVILLE — Disenchanted by his job as a delivery driver, Darrell Wise finally found the professional fulfillment he sought by going out on a limb. “Basically, I hated my job, so my wife suggested that I go back to school,” he explains. “That had been the plan when we first got married, but once we had kids and a mortgage, it seemed a lot less plausible. Eventually, I took her advice and enrolled at a local college. I decided to study horticulture, mainly because it sounded easy and interesting. It ended up being a lot more challenging than I expected, Read more

Expert tip
The Truth about Transplanting
DANVILLE — If you have a tree on your property that’s overgrown or in the way, you may have considered transplanting it. However, few people realize that tree transplanting is rarely successful—in most cases, it’s just an expensive way… Read more

Chad Ray is operations manager of Oak Plumbing Inc., a Diamond Certified company. He can be reached at (707) 652-9121 or by email.


Chad Ray: Headfirst

By James Florence, Diamond Certified Resource Reporter

BENICIA — Not knowing whether he’d sink or swim, Chad Ray jumped headfirst into what would ultimately be a successful plumbing career. “While looking for a new job, I decided to answer a craigslist ad for a plumber’s assistant,” he relates. “I had no plumbing experience whatsoever, but I liked working with my hands, so it seemed like something I’d enjoy. On my first day, we did a trenchless sewer replacement. It was basically trial by fire, but I passed and totally fell in love with plumbing in the process.”

After gaining further experience as a laborer, Chad moved up to being a field technician and ultimately went into management. Read more

Expert tip
The Larger Implications of a Recurrent Line Backup
BENICIA — If you have a recurrent problem with your sink or toilet backing up, you may have purchased Drano® or a similar product to remedy the situation. However, it’s likely you’re dealing with a much bigger problem than can… Read more