The Certification Process






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  • Accurate Ratings

    Local companies rated
    Highest in Quality and Helpful Expertise.

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  • 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

Ralph Foglein Owner
European Auto Works

Jim Baylor Consumer
Bay Area

Mark Corrallo President
All Seasons Construction

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...

Tip Sheet: Four Preventative Measures for a Tenancy

Posted on August 03, 2017 by James Florence

While part of preparing a rental property for market is getting the physical space move-in ready, the other part is addressing non-physical details such as tenant screening. Due to the potential consequences of oversights or poor decisions in this area, it’s important to take a meticulous, preventative approach. To learn a few critical steps, read the following tip sheet by Diamond Certified Expert Contributor Sam LaPlaca of CM Property Management Inc.:

1. Verify income. Accepting a tenant who can’t afford the rent is a mistake that can cost you a lot of time, money and frustration. That’s why, in addition to asking for pay stubs and bank statements, Read more

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Posted in: Consumers
Tags: ,

Is there a “Right Way” to Give Feedback?

Posted on July 27, 2017 by Joy Lanzaro

Delivering feedback isn’t always easy. Before deciding to speak up, you may wrestle with competing goals of personal and social responsibility versus a desire to avoid conflict. At some point, every service provider has needed constructive feedback to better serve their customers. In speaking to thousands of consumers over the years, I’ve found that some people prefer to silently move on and not use that company’s services again. In those cases, everyone loses. Armed with the following tips, you may feel empowered to turn an unsatisfactory situation around and experience increased goodwill and satisfaction. Read more

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Posted in: Consumers, Customer Service

5 Ways to Lower Your Cooling Costs

Posted on July 20, 2017 by James Florence

A central air conditioner can be priceless on a hot summer day, but the cost of running it certainly isn’t. While having a well-maintained, energy-efficient system will help keep your cooling bills in check, another smart step is finding ways to keep your home naturally cooler, which reduces the need to run your system in the first place. Here are five measures to consider:

1. Install a whole house fan. On summer mornings and evenings, it’s not unusual for the temperature outside the home to be cooler than on the inside. In this instance, running the air conditioner can feel like a waste of energy. If only there was a way to get that cool outdoor air into the home… Read more

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Posted in: Home Tips, Home Improvement
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  • Discovery S.

    Verified customer
    Quality 10
    Loyalty Yes
    Helpful expertise Yes

    I have told a couple of friends that they do an awesome job and they know their business. They take care of us as an administrator for lots of plans for our employees. They do an awesome job.
    The people who work there are so awesome, like Dave Hodges and Val and Stewart and Chelsea.

    Response to Diamond Certified Company Vantreo Insurance Brokerage

  • Rudy S.

    Verified customer
    Quality 10
    Loyalty Yes
    Helpful expertise Yes

    To use them, call them.
    They had a very friendly technician, and they got the job done. Whenever I pointed things out to them, they corrected it.

    Response to Diamond Certified Company All In One Home Services


Eloy Baeza is a 27-year veteran of the plumbing industry and owner of Baeza Plumbing Service, a Diamond Certified company. He can be reached at (831) 708-8920 or by email.


Eloy Baeza: Making His Mark

By James Florence, Diamond Certified Resource Reporter

GILROY — When Eloy Baeza started doing plumbing work as a young man, he didn’t realize he was preparing for a lifelong career. “My brother-in-law was a plumber, and as a teenager, I would sometimes go out and help him on jobs,” he remembers. “I learned a lot from him, which ended up coming in handy later in life.”

After high school, Eloy joined the military, but midway through his enlistment, an injury sent him back home. Fortunately, his prior experience in plumbing gave him something to fall back on. “I finished the last year of my enlistment with the National Guard,” he explains. Read more

David Breslin is a veteran of the construction industry and CEO of Current Construction, a Diamond Certified company. He can be reached at (415) 754-3940 or by email.


David Breslin: Building Inspiration

By James Florence, Diamond Certified Resource Reporter

SAN FRANCISCO — Unlike many building contractors, David Breslin didn’t have a family connection to the construction trades when he was growing up—he simply felt an innate inspiration. “From childhood on, I’ve always loved working with my hands,” he affirms. “I grew up in a small town in Ireland during the economic boom, so there was always a lot of work going on, which got me even more interested in building.” Following high school, David launched his construction career and began working his way up through the ranks. “I started out digging holes and getting coffee for the crews, and bit by bit, Read more

Expert tip
Do-It-Yourself Seismic Retrofitting
SAN FRANCISCO — As residents of “earthquake country,” homeowners in the Greater San Francisco Bay Area need to be proactive about preparing for the next “big one.” While part of this involves having supplies and an evacuation plan ready,… Read more

Colm Higgins is a veteran of the construction industry and co-owner of Current Construction, a Diamond Certified company. He can be reached at (415) 754-3940 or by email.


Colm Higgins: A Long Road to Success

By James Florence, Diamond Certified Resource Reporter

SAN FRANCISCO — As co-founder of Current Construction, Colm Higgins looks back on the long road that led to where he is today. “My father was a carpenter and taught me the trade when I was a young man,” he remembers. “At the time, he was living in New York while the rest of our family was in our home country of Ireland, so I would visit him during the summers and work with him. Later, after graduating from college with a business degree, I started looking into the kinds of careers I was eligible for. It didn’t take long for me to realize it wasn’t where I wanted to be. Read more

Expert tip
Proper Planning for a Remodeling Project
One of the most critical aspects of a remodeling project is planning. Not only does proper planning help ensure a quality final product, it also saves time and money during the course of the project. So, if you’re… Read more

Dawn Fore is an 18-year veteran of the cabinet industry and owner of Napa Valley Cabinet Company, a Diamond Certified company. She can be reached at (707) 584-6668 or by email.


Dawn Fore: An Unexpected Career

By James Florence, Diamond Certified Resource Reporter

NAPA — Dawn Fore never planned on becoming a professional cabinet designer, but after filling in at the business of a family friend, that’s exactly what happened. “It was a fluke, really,” she says. “My dad’s friend owned a cabinet shop, and when his designer had to go on leave due to a family emergency, I was asked if I could fill in temporarily. At the time, I was working for the school district’s athletics department—I must have been on spring break because I was available, so I agreed to help. I ended up having a lot of fun with it. Read more

Expert tip
Assessing Cabinet Construction Quality
NAPA — When looking at cabinets, you may notice a lot of them look the same. For example, every cabinet manufacturer nowadays has a painted shaker-style cabinet on the market. However, despite the apparent similarities, all cabinets are not created… Read more