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...

Do I Need All This Stuff?

Posted on February 22, 2018 by Chris Bjorklund

Since the recent California wildfires, many of us have been reassessing our relationships to our possessions. Since my home was safe, my immediate response was to find useful items to donate to the fire victims. In fact, many Sonoma County donation sites were overwhelmed with people’s generosity and had to turn away used clothing and furniture. They requested cash donations instead or things like toaster ovens, hot plates and electric teapots for those living in temporary housing.

The stories about what evacuees took with them and what they left behind made many of us think about which of our belongings have value and meaning and which don’t. Read more

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Posted in: House Cleaning, Home Maintenance, Consumers, Home Tips, Personal Stories, Savvy Tips
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Winter Road Safety Checklist

Posted on February 20, 2018 by James Florence

Throughout most of the year, Bay Area residents enjoy exceptionally pleasant weather, exemplified by mild temperatures and plenty of sunshine. The problem is, in this characteristically comfy climate, it’s easy to forget about preparing for when the weather isn’t so nice. Take winter road safety, which many Northern California drivers neglect to prepare for due to the relatively brief rainy season. However, with the slick roads and diminished visibility winter weather often brings, it’s necessary to address this crucial concern. To help you do this, we’ve created the following checklist of areas to assess on your vehicle. Read more

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Posted in: Seasonal, Auto Tips, Consumers
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Three Ways to Reduce Soil Erosion and Landslide Risk

Posted on February 15, 2018 by Suzanne Carroll

Soil erosion occurs when loose portions of topsoil are displaced, usually by wind or rain. For the most part, erosion is a natural process, but it can become a problem when weather conditions accelerate the rate of topsoil loss, such as on a cliff or hillside following heavy rains. With so many neighborhoods in the Bay Area built on steep terrain, many homeowners worry about soil erosion and the accompanying landslide risk during the rainy season. Making major investments in retaining walls or foundation reinforcement is one option, but there are less costly measures homeowners can take to help protect their properties as well. Read more

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Posted in: Home Improvement
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5 Things to Ask an HVAC Installer

Posted on February 13, 2018 by James Florence

Before hiring a company to install your new furnace or air conditioner, there are several things you’ll need to inquire about, from licensing and insurance to scheduling and payment. However, there are a few questions many homeowners don’t think to ask, but should. Here are five things to ask an HVAC installer:

  1. “What’s included in your estimate?”

When reading an HVAC installer’s estimate, make sure it addresses the big picture. In other words, it should take into account all aspects related to your home HVAC system, not just the unit itself. Since the heating or cooling unit is merely part of the larger whole, failure to address other important system aspects (such as ductwork) can result in subpar performance following installation. Read more

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Posted in: 5 Things to Ask, HVAC
Tags: ,

  • Mark F.

    Verified customer
    Quality 10
    Loyalty Yes
    Helpful expertise Yes

    Howard is the best.
    This is my third or forth business transaction with Howard. He's honest, he gives you all the information you need up front, he reminds you of everything that needs to be done, and keeps on all the details. Howard is great, and I've dealt with a lot of realtors I have no use for.

    Response to Diamond Certified Company Howard Bloom - Intero Real Estate

  • Renee E.

    Verified customer
    Quality 10
    Loyalty Yes
    Helpful expertise Yes

    They did a good job at reasonable price.
    They seemed trustworthy and did a good job.


Alex Figueroa is owner of Marin Carpet Care and Cleaning Services, a Diamond Certified company. He can be reached at (415) 846-4631 or by email.


Alex Figueroa: Customer-Oriented

By James Florence, Diamond Certified Resource Reporter

SAN RAFAEL — When Alex Figueroa started working part-time as a carpet cleaner, the last thing he expected was to be running the company one day. “I started working at Marin Carpet Care and Cleaning Services seven years ago,” he recounts. “I came on part-time to help my friend, Mark, who owned the business. In 2015, Mark passed away and left the company to his wife. Since we were good friends, I agreed to partner with her in running the business and eventually transition to becoming the owner. I’ve been running the company myself since June 2016.”

Today, Alex says his favorite part of his job is interacting with customers. Read more

Expert tip
When (and When Not) to Use Organic Carpet Cleaning Products
SAN RAFAEL — Organic, all-natural cleaning products are very popular nowadays, and carpet cleaning products are no exception. Unlike standard carpet cleaning products, organic products don’t contain any of the toxic chemicals traditionally used to eliminate dirt and stains. For… Read more

Luis Baltodano is owner of Baltodano’s Drywall, a Diamond Certified company since 2015. He can be reached at (925) 233-6250 or by email.


Luis Baltodano: Stepping Toward Success

By James Florence, Diamond Certified Resource Reporter

BRENTWOOD — When Luis Baltodano got his first job out of high school, he didn’t know he was taking his first step toward a long-term career. “After high school, I needed a job, so I just started calling around to different companies in the Bay Area,” he recounts. “Eventually, I found work with a small drywall company in the East Bay. I started as a laborer, worked my way up to being a taper and eventually became a journeyman drywall finisher. After working for a couple of different companies, I decided I was ready to do my own thing and started my own drywall business.”

Today, Read more

Expert tip
Tips for Drywall Repair
BRENTWOOD — From relocated electrical outlets to damage caused while moving furniture, there are many scenarios that require drywall repair. If you’re planning to patch an area of drywall in your home, you’ll need to make sure you’re… Read more

Mike Mari is owner of Above All Smog, a Diamond Certified company. He can be reached at (925) 456-4964 or by email.


Mike Mari: Smog Star

By James Florence, Diamond Certified Resource Reporter

SAN RAMON — Mike Mari was always driven to succeed, but after partnering with his brother in the smog testing industry, his career went into overdrive. “Growing up, my brother, Chris, and I both loved cars, and each of us ended up working in the automotive industry,” he recounts. “After Chris got involved in smog testing, I started to look into it as well. I was interested in the technology, as well as the important role smog testing plays in maintaining air quality in California. Pretty soon, I decided to get into the smog testing field myself. A couple of years later, Read more

Expert tip
Understanding Smog Testing Methods
SAN RAMON — When it comes to smog testing a vehicle, the method of testing varies depending on the vehicle’s age. To know what your upcoming smog test will involve (as well as some ways to prepare), read… Read more

Jake Newman Jr. is HVAC Service Manager of Burkell Plumbing, Inc., a Diamond Certified company. He can be reached at (415) 690-7905 or by email.


Jake Newman Jr.: The Next Generation

By James Florence, Diamond Certified Resource Reporter

SAUSALITO — As a second-generation participant in his family’s plumbing and heating business, Jake Newman Jr. was destined to follow in his father’s footsteps. “My dad has been with Burkell Plumbing for almost 40 years and became the owner when I was in my early 20s,” he explains. “I’d started helping out with the business a couple of years prior, doing things like cleaning the shop, delivering parts and helping with paperwork in the office. When I turned 21, I enrolled in an HVAC certification program at Specialty A/C Institute in Benicia, where, in addition to classroom education, Read more

Expert tip
How to Troubleshoot Your Thermostat
SAUSALITO — If your thermostat stops working, there are a couple of things you should check before calling a professional. The first is simple: make sure it has batteries. Locate the battery compartment either by taking the thermostat off the… Read more