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  • Accurate Ratings

    Local companies rated
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  • Deep Info™

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

LOCAL CONSUMERS AND COMPANIES RELY ON THE DIAMOND CERTIFIED RESOURCE

Barbara Schallau Consumer
Bay Area

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

Jagdish Hegde Consumer
Fremont

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

BROWSE BY MAJOR CATEGORIES
WHY CHOOSE A DIAMOND CERTIFIED COMPANY?
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®.
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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 diamondcertified.org, 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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WHAT’S IN EACH DIAMOND CERTIFIED COMPANY REPORT?
SAMPLE COMPANY REPORT

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

  • ACCURATE RATINGS

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

    VERBATIM SURVEY RESPONSES

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

    VIDEO PROFILE

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

    ESSENTIAL ARTICLES

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

    CAPABILITIES TABLE

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

    TOPIC-BASED EXPERT CONTRIBUTIONS

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

    PHOTO GALLERY

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

    COMPANY WEBSITE & EXTERNAL FEED

    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...

DIAMOND CERTIFIED CONSUMER INFORMATION AND RESOURCES
Expressing Gratitude All Year Long

Posted on November 29, 2018 by Chris Bjorklund

During the month of November and the Thanksgiving season, most of us are more focused than usual on the gift of gratitude. But given the positive impact of gratitude on others, perhaps we should think about ways to express our gratitude throughout the year.

I started reflecting on that the other day after listening to my voicemail. A local framing store manager called to let me know that my two paintings were ready to be picked up. Then, he added something extra—he said he sincerely appreciated my continued business, which meant a lot to him. Read more

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Posted in: Holiday Related, Seasonal, Consumers, Customer Service, Savvy Tips
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After-Party Cleanup

Posted on November 27, 2018 by Suzanne Carroll

Hosting a big holiday get-together can be great. Surrounded by family members, friends and neighbors (and maybe their kids and pets, too), you can create a sense of comradery and memories that last a lifetime. But once the sofa bed is folded away and the last load of pots and pans runs through the dishwasher, reality sets in. Hosting for the holidays has turned your house completely upside-down.

Now it’s time to clean up, recover and get your home back to normal. Let’s look at some ways to restore order after hosting for the holidays.

 

Cleaning Hardwood Floors

During your holiday celebration, your hardwood floors probably endured much more foot traffic than usual. Read more

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Posted in: Holiday Related, House Cleaning
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LATEST PHONE SURVEY RESPONSES FROM VERIFIED CUSTOMERS
  • Brett C.

    Verified customer
    Quality 10
    Loyalty Yes
    Helpful expertise Yes
    Critique

    They came on time, they were quick in the installation, knowledgeable about their industry and the materials, and were experienced in installation.
    Everything turned out nicely and still looks great so we were satisfied.

  • Birgit K.

    Verified customer
    Quality 10
    Loyalty Yes
    Helpful expertise Yes
    Critique

    They were very professional, accommodating, and they got me in right away. I was in and out in a very timely manner.
    They were very timely. They kept me informed, they dealt with my insurance company, and I didn't have to worry about anything.

    Response to Diamond Certified Company Campbell Collision Center, Inc.

THIS WEEK’S FEATURED DIAMOND CERTIFIED EXPERT CONTRIBUTIONS

Steve Ionis is president of Rayne Plumbing and Sewer Service, Inc., a Diamond Certified company since 2004. He can be reached at (408) 283-0600 or [email protected]

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Steve Ionis: The Long Road

By James Florence, Diamond Certified Resource Reporter

SAN JOSE — If you ask Steve Ionis where he’s from originally, he’s likely to reply that there’s no such thing as “original”—an apt response from a man whose upbringing took place in various spots around the world. Steve was born in Shanghai, China, his parents having emigrated from Russia several years prior. Soon after his birth, the rise of Mao Zedong compelled them to relocate to the recently formed state of Israel, where the family resided for six years before moving again, this time to Tokyo, Japan. After he graduated high school, Steve spent three years in the Israeli army, Read more

Expert tip
A Green Way to Deal with Hard Water
SAN JOSE — Hard water is a common problem in the Bay Area—not only does it leave people with a rough feeling when they come out of the shower, it often causes damage to homeowners’ water pipes, water… Read more

Harold Bloom has been selling homes in Santa Clara and San Mateo Counties since 1985. He can be reached at (650) 605-3928 or by email.

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Howard Bloom: Still Having Fun

By James Florence, Diamond Certified Reporter

LOS ALTOS — When asked what inspired him to get into real estate, Howard Bloom says it was more fun than his day job. “Before I was a real estate agent, I worked as a hospital administrator. In 1982, I started buying and reselling government-repossessed properties. Pretty soon, I was buying two or three properties a year. Eventually, I decided real estate was more fun than being in meetings all day. Plus, I was using a lot of the same skills I used at my job: dealing with people, solving problems and negotiating contracts. In 1985, I began doing real estate full-time and have been at it ever since.”

Today, Read more

Expert tip
Choosing a Quality Real Estate Agent
LOS ALTOS — If you’re looking to buy a home, one of the first things you should do is choose an agent to represent you. However, just any agent won’t do—to ensure a successful outcome, you’ll need to choose a… Read more

Kyle Unciano is sales manager at American Window Systems, Inc., a Diamond Certified company since 2010. He can be reached at (707) 879-8946 or by email.

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Kyle Unciano: A Window of Opportunity

By James Florence, Diamond Certified Resource Reporter

NAPA — Kyle Unciano was in between jobs, contemplating his next move, when he happened upon a window of opportunity. “I had worked in fine dining for years and came to a point where I needed a change,” he remembers. “Around that time, my grandparents needed some extra help in the office at the family business, American Window Systems. They started the business in 1992 and have kept it in the family ever since—in fact, my brother is one of their lead installers. I started working in the office part-time, and from there I moved up to sales manager.”

Today, Read more

Expert tip
Replacing Windows in Stucco Homes
NAPA — When it comes to replacing residential windows, there are two different methods in use: new construction and retrofit. With the new construction method, the windows and frames are completely removed and replaced, a process that requires disrupting sections… Read more

Chris Testa is sales manager at Sure Roofing & Waterproofing, a Diamond Certified company since 2002. He can be reached at (415) 493-8959 or by email.

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Chris Testa: A Sure Trajectory

By James Florence, Diamond Certified Resource Reporter

SAN FRANCISCO — After four decades in the roofing and construction industries, Chris Testa has no regrets about the trajectory his professional livelihood has taken. “I started working in construction while attending college in the ’70s, and from there I got into roofing,” he explains. “What I like about roofing is it’s the finishing touch to any building—it serves both as the protection for the overall structure and its crowning architectural detail. Few people dream of getting into roofing when they’re a kid, and I certainly didn’t, but I ended up here and I’m quite happy I did.”

Today, Read more

Expert tip
How to Maximize Your Roof Investment
SAN FRANCISCO — Let’s face it: replacing a roof is expensive. It doesn’t matter whether you buy the cheapest roof available or the most expensive—either way, it’s a big, messy job that costs a lot of money. For this reason,… Read more

Kevin Comerford is president of Service Champions, a Diamond Certified company. He can be reached at (714) 777-7777 or by email.

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Kevin Comerford: Taking the Lead

By James Florence, Diamond Certified Resource Reporter

PLEASANTON — Kevin Comerford has roots in the HVAC industry, but it took some time for him to realize his place in his family’s legacy. “My father, Don Comerford, started his business, Comerford Heating and Air, in 1971, so I basically grew up in the industry,” he recounts. “After graduating from Cal Poly with a degree in journalism, I went to work for the San Luis Obispo Chamber of Commerce. I enjoyed working with small-business owners so much that it renewed my interest in my parents’ business. I was also fascinated with the innovative developments that were happening in the HVAC industry at the time. Read more

Expert tip
5 Steps to Prepare Your HVAC System for Winter
PLEASANTON — Following the heat of summer and the mildness of fall, the cold winter weather brings an entirely different set of heating and ventilation needs for the home. To ensure your HVAC system is equipped for optimal performance, consider… Read more

Russell Calhoon is project manager at Paradigm Concrete & Construction, Inc., a Diamond Certified company. He can be reached at (925) 385-8993 or by email.

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Russell Calhoon: A Firm Foundation

By James Florence, Diamond Certified Resource Reporter

ANTIOCH — By the time Russell Calhoon started working for a concrete contractor, he already had a firm foundation in the trades. “I’m a third-generation builder,” he explains. “I grew up in construction and worked for my dad from childhood all the way to adulthood. My dad taught me a lot, both on and off the jobsite. He actually taught apprenticeship classes on roof framing and stair framing at a local college, and I often went with him to those. We eventually became partners in a business that held licenses in foundation work, general construction, plumbing, electrical, solar power and sewer work.”

After his father retired, Read more

Expert tip
Often-Overlooked Aspects of a Concrete Project
ANTIOCH — If you’re planning a concrete project, be sure to consider the following aspects: Minimum cost Most concrete contractors have a minimum charge for concrete work. If you only have one small project in mind, it might not meet… Read more

Chris Hampton is owner of CDH Construction, a Diamond Certified company. He can be reached at (707) 207-6954 or by email.

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Chris Hampton: A Simple Motivation

By James Florence, Diamond Certified Resource Reporter

ROHNERT PARK — Chris Hampton’s involvement in the construction trade began with a simple motivation. “I wanted to work outside,” he explains. “At the time, I had been working in warehouses and kitchens since I was 13, and I just knew it wasn’t for me. I started getting into outdoor work like landscaping and concrete, and I gradually gravitated toward fine carpentry like cabinets and trim work. In 2010, I started my own construction and home repair business, and I’m still running it today.”

Today, as owner of CDH Construction, Chris says his favorite part of his job is simply doing the work. Read more

Expert tip
Considerations for New Baseboards
ROHNERT PARK — If you’re planning to install new baseboards in your home, there are a couple of things you’ll need to consider. One is the type of material to be used. You essentially have two choices: authentic wood or… Read more

Kyle Barnhart is vice president of Mike Testa Plumbing, Inc., a Diamond Certified company. He can be reached at (415) 868-5917 or by email.

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Kyle Barnhart: Gradual Growth

By James Florence, Diamond Certified Resource Reporter

SAN RAFAEL — Looking back on his plumbing career, Kyle Barnhart identifies a gradual progression of steady professional growth. “My entire career has basically been one big on-the-job learning experience,” he says. “It started in my childhood—my father was a plumber and he used to take me with him to jobsites. I always had an interest in the trade, especially the troubleshooting aspect. You really have to use your brain, and a lot of times, it’s like figuring out a puzzle. After high school, I got a job with a general contractor I knew and things took off from there. Read more

Expert tip
Maintaining Your Water Heater
SAN RAFAEL — Most water heater problems stem from a lack of routine maintenance. Over time, sediment and mineral buildup can inhibit a water heater’s efficiency and water flow, leading to subpar performance and even premature failure. Routinely flushing your… Read more

Oscar Sanchez is owner of Aqua Stat Plumbing, Inc., a Diamond Certified company. He can be reached at (510) 244-4660 or by email.

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Oscar Sanchez: A Rewarding Career

By James Florence, Diamond Certified Resource Reporter

HAYWARD — When he first got into plumbing, Oscar Sanchez worried he’d made a mistake. However, looking back, he’s glad he decided to stick with it. “I like to say, ‘I didn’t choose plumbing, plumbing chose me,’” he laughs. “Partway through college, I got married and needed to make more money, so I decided to drop out of school and find a full-time job. I had a connection in the plumbing industry, so I became an apprentice. At first, I didn’t like it—it was a lot of grunt work and it was hard. However, after a while I started doing more hands-on work and learning the more intricate parts of the job. Read more

Expert tip
An Effective Tool for Clearing a Drain
HAYWARD — When one of your sink or tub drains gets clogged, you may think you need to call a plumber to get it cleared. However, with the right tool, you may be able to do this yourself. While there… Read more

Dave Lopez is owner of Advanced Roofing Services, Inc., a Diamond Certified company since 2003. He can be reached at (510) 592-4978 or by email.

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Dave Lopez: Roof Dreams

By James Florence, Diamond Certified Resource Reporter

ALAMEDA — When asked why he got into the roofing trade, Dave Lopez cites both a family connection and an entrepreneurial aspiration. “My dad was a roofer, so I became familiar with the trade early on,” he recounts. “After high school, I started working in the industry and climbed up the ladder from apprentice to journeyman, foreman, and then superintendent. My goal from day one was to have my own roofing business, which I achieved in 1998. I started out with a pickup truck, working out of my home, and from there I expanded into a shop and an office. Read more

Expert tip
The Impact of Roof Pitch on Roofing Material Selection
ALAMEDA — Tar and gravel roofs have been around for a long time, but in recent years their popularity has waned. This is largely due to aesthetics, with many homeowners choosing to replace their tar and gravel roofs with composition… Read more

Hesam Rezaee is president of Molly Maid of Sonoma County, a Diamond Certified company. He can be reached at (707) 219-6365 or by email.

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Hesam Rezaee: A Clean Opportunity

By James Florence, Diamond Certified Resource Reporter

PETALUMA — An avid entrepreneur, Hesam Rezaee was in between business ventures when he came upon a clean opportunity. “Previously, I ran a coffee shop and a print shop, which were located right next to each other,” he recounts. “Running two businesses simultaneously was hard, and after about two years, I was burned out. I sold one of them, closed the other and took a six-month break. During this time, I started looking for a new opportunity—something that had a good business model and family-friendly hours. When I came across a Molly Maid franchise in Sonoma County that was for sale, Read more

Expert tip
How (and When) to Clean Your Dishwasher
PETALUMA — Your dishwasher cleans your dishes, but sometimes it needs to be cleaned as well. Here are some signs that it’s time to clean your dishwasher: Reduced effectiveness in washing Calcium stains from the hard water An unpleasant odor… Read more

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

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James Burton: True Survivor

By James Florence, Diamond Certified Resource Reporter

BENICIA — Before he was general manager of Oak Plumbing Inc., James Burton handled logistics for major corporate accounts—no small responsibility, to be sure. “In my prior career, I ran massive warehouses on huge accounts for clients like Honeywell and Hewlett-Packard,” he details. “One of the biggest accounts I managed was a billion-dollar vaccine program. It wasn’t unusual for me to be managing up to 400 employees at one time.”

So, how did someone accustomed to handling such large-scale operations end up working at a small plumbing company? As James relates, it resulted from the combination of a lifelong friendship and a life-altering event. Read more

Expert tip
Thinking Proactively About Your Plumbing System
BENICIA — When it comes to maintaining your home, one of the best things you can do is think proactively. The health of your home is just like the health of your body. Most of us tend to think proactively… Read more