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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.

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
DIAMOND CERTIFIED BLOG
Diamond Certified Experts: Pest-Proofing Your Home

Posted on July 16, 2019 by James Florence

“Termites and spiders and rats, oh my!”

Even if you don’t have a deep-seated fear of these pests, the last place you want to find them is inside your home. Pest infestation can leave a home vulnerable to everything from unsanitary conditions to structural damage. To help you avoid this situation, we’ve asked five Diamond Certified Expert Contributors to provide some tips for pest-proofing your home. Read more

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Posted in: Pest Control, Diamond Certified Experts
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Dealing With Carpet Pile Distortion

Posted on July 11, 2019 by James Florence

Have you noticed areas of your carpet that appear lighter or darker than the rest? At first glance, you might think it’s staining or fading, but what you’re more likely seeing is pile distortion—a phenomenon that occurs when certain sections of pile go against the natural “grain” of the carpet. In this article, we’ll go over some different types of carpet pile distortion and what you can do to minimize their effects. Read more

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Posted in: Flooring
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LATEST PHONE SURVEY RESPONSES FROM VERIFIED CUSTOMERS
  • Mike B.

    Verified customer
    Quality 10
    Loyalty Yes
    Helpful expertise Yes
    Critique

    I love this company. They suggested places to put specific plants and bushes because of how the sun enters the property. They really know a lot about what they do.
    I like the fact that I can suggest a want or need, and it is strategically planned to meet those requirements.

    Response to Diamond Certified Company Tree Pros

  • Connie M.

    Verified customer
    Quality 10
    Loyalty Yes
    Helpful expertise Yes
    Critique

    They were very professional, there were no surprises, and the product arrived as advertised.
    I am thrilled with the fact that they monitor me to make sure everything is running smoothly. Rich Moore was great.

    Response to Diamond Certified Company Freedom Solar, Inc.

THIS WEEK’S FEATURED DIAMOND CERTIFIED EXPERT CONTRIBUTIONS

Ron Kiesel is president of Fireplace Door Guy LLC, a Diamond Certified company. He can be reached at (408) 692-5980 or by email.

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Ron Kiesel: A Door of Opportunity

By James Florence, Diamond Certified Resource Reporter

NOVATO — After losing his livelihood to an economic downturn, Ron Kiesel was fortunate to come across a brand-new door of opportunity. “In the early 2000s, I was a project manager for a housing developer based in Mexico,” he recalls. “Living part-time in Mexico and part-time in Truckee, I had the best of both worlds. However, when the economy crashed in 2008, it all ended. The Mexican economy is very dependent on the U.S. economy, so, not surprisingly, the housing market took a big hit, which put me out of a job. While figuring out what to do next, Read more

Expert tip
2 Ways to Update Your Fireplace
NOVATO — Even if your home has been remodeled to today’s style and standards, one aspect may still be obsolete: your fireplace. Here are a couple of ways to bring an outmoded fireplace up to date: 1. Aesthetics Whether they… Read more

Jason Stergion is partner at Just Hardwood Floors, a Diamond Certified company. He can be reached at (415) 484-5469 or by email.

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Jason Stergion: More Than a Career

By James Florence, Diamond Certified Resource Reporter

CAMERON PARK — For Jason Stergion, getting into the hardwood floor business was more than just a career choice—it was a decision to continue a family legacy. “My dad started Just Hardwood Floors in 1989,” he recounts. “I started working there during the summers in high school. I liked the industry a lot—the craft, the challenges, the camaraderie on the jobsites. I also liked the idea of one day owning a business and having the freedom to decide my own schedule. With that in mind, I figured there was no better opportunity than to stay with the family business. Read more

Expert tip
Repairing Hardwood Floor Damage
CAMERON PARK — Has an area of your hardwood floor been damaged by moisture or scratching? You’ll be glad to know this damage can likely be repaired with refinishing. However, the challenge will be getting the refinished area to match… Read more

Carlos Barbosa is sales manager of Brasmerica Pavers System, a Diamond Certified company. He can be reached at (707) 879-8949 or by email.

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Carlos Barbosa: Paver Protégé

By James Florence, Diamond Certified Resource Reporter

PINOLE — When asked about the origin of his career in the paver industry, Carlos Barbosa says it all started with a casual friendship. “Before I started working with pavers, I worked for my dad doing excavation and debris hauling. In 2009, I met Alberto Lisboa, who was installing pavers as a subcontractor on a jobsite I was on, and we became friends. A few years later, Alberto started his own paver business and told me I should come work for him—an opportunity I gladly accepted. He thought I’d be good at sales but felt I first needed to get an education in the industry. Read more

Expert tip
An Important Credential for Paver Contractors
PINOLE — One of the most important steps of hiring a contractor is verifying their credentials, including proper licensing and insurance. If you’re hiring for a paver project, one important credential to look for is certification with the Interlocking Concrete… Read more

Harvey Weil is sales and marketing specialist at Advanced Auto Body & Collision Repair Inc., a Diamond Certified company. He can be reached at (925) 388-6936 or by email.

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Harvey Weil: Service Savant

By James Florence, Diamond Certified Resource Reporter

PITTSBURG — With a professional background in hotel management, Harvey Weil knows a thing or two about customer service. “I was a general manager for Marriott for 25 years, first in Chicago and then later in San Jose,” he recounts. “At one point, I managed a kitchen that employed 200 people and put out thousands of meals each day. Later, I went to work for Hertz, where I met a lot of professionals in the auto body industry. After retiring from Hertz, the owner of a body shop asked me if I would help him with marketing. I figured it would be a good way to keep busy, Read more

Expert tip
Choosing an Auto Body Shop
PITTSBURG — If you need to file an auto insurance claim, your provider will recommend using an auto body shop that’s part of its direct repair program. However, it’s important to realize that you aren’t limited to the options presented… Read more

Sheila Deignan is a Realtor with Better Homes and Garden Real Estate | Wine Country Group, a Diamond Certified company. She can be reached at (707) 520-0129 or by email.

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Sheila Deignan: A Passionate Profession

By James Florence, Senior Writer

SONOMA — For Sheila Deignan, a career in real estate represents the culmination of professional expertise and a passion for helping others. “Before I got into real estate, I was a paralegal involved in negotiations and venture capital marketing coordination,” she recounts. “At a certain point, a broker I knew told me I would make a great real estate agent. The more I thought about it, the more it made sense. Because of my professional background, I had a lot of relevant skills, and the idea of helping people buy and sell homes really appealed to me. I eventually decided to pursue a career in real estate, Read more

Expert tip
4 Tips for Your Home Search
SONOMA — Buying a new home is a big decision, to say the least, so you should do everything in your power to ensure a wise choice. Here are some tips to keep in mind: Know what you want. Don’t… Read more

Vladimir Galant is president of 911 PC Help, a Diamond Certified company. He can be reached at (415) 523-6060 or by email.

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Vladimir Galant: A Hi-Tech Career

By James Florence, Diamond Certified Resource Reporter

CASTRO VALLEY — After more than two decades working with computer technology, Vladimir Galant is still going strong. “I started out by running an internet service provider in my home country of Lithuania,” he remembers. “It was a completely different scene in that time and place—a lot of people didn’t even know what the internet was, so it took quite a bit of courage and effort to build a company there.” In 2000, Vladimir moved to the United States to take a management position at an internet service provider in California. However, when the dot-com bubble burst just a year later, Read more

Expert tip
What to Do When Liquid Spills on Your Laptop
CASTRO VALLEY — When liquid spills on your laptop, knowing how to react can make all the difference. If the computer is asleep/turned off, your initial instinct may be to wake it up/turn it on to see if it still… Read more

Nick Neira is president of NIC Plumbing Co., a Diamond Certified company. He can be reached at (650) 288-6749 or by email.

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Nick Neira: Filling the Void

By James Florence, Diamond Certified Resource Reporter

CAMPBELL — Originally a general contractor by trade, Nick Neira started a plumbing business to fill a void he saw in the industry. “While working as a general contractor, I had a hard time finding reliable plumbers,” he explains. “It seemed like the industry needed more good plumbers, so instead of continuing to depend on unreliable contractors, I decided to start my own plumbing business.”

Today, as owner of NIC Plumbing Co., Nick says his favorite thing about plumbing is the swift gratification. “Large building projects often last for several months, which can get a little repetitive. Read more

Expert tip
How to Flush a Tankless Water Heater
CAMPBELL — While more technologically advanced than conventional water heaters, tankless water heaters still require ongoing maintenance. One crucial step is flushing your water heater one or two times per year, which removes sediment buildup in its heat exchanger to… Read more

Robert Kaljian is owner of Kaljian Construction Inc., a Diamond Certified company. He can be reached at (925) 243-7706 or by email.

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Robert Kaljian: A Natural Builder

By James Florence, Diamond Certified Resource Reporter

CONCORD — For Robert Kaljian, a career in the construction industry was a natural fit. “I started doing construction work back in high school,” he remembers. “It came pretty naturally to me. I particularly enjoyed the process of diagnosing and solving problems.” Later, Robert ran a cabinet shop where he designed, built and sold custom cabinetry. However, as time went on, he began to think bigger. “I started to get more interested in trades like electrical and plumbing. In 2002, I got my contractor’s license and started doing home remodeling. In recent years, I’ve pared down the business to focus more on bathroom and kitchen remodeling, Read more

Expert tip
The Best Place to Get Home Remodeling Products
CONCORD — When buying products and materials for a home remodeling project, most homeowners assume they should go to their local home improvement stores. In reality, when it comes to remodeling, home improvement stores are more like convenience stores. Since… Read more

Lamar Spalding is president of All In One Home Services, a Diamond Certified company. He can be reached at (925) 938-6251 or by email.

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Lamar Spalding: An Unlikely Inspiration

By James Florence, Diamond Certified Resource Reporter

DUBLIN — With a background in product management, Lamar Spalding never expected to one day own a home repair business. However, in the course of renovating his own home, he was struck by an unlikely inspiration. “In 1989, I purchased a ‘fixer upper’ and spent the next seven years working on it,” he remembers. “During this time, I worked with a lot of contractors and was quite amazed at the inconsistency of my experiences. Some contractors were really organized and on top of things while others seemed like they were just winging it. This made it challenging to find the right professionals for the job, Read more

Expert tip
How to Choose a Quality Contractor
DUBLIN — A successful home improvement project starts and ends with the choice of a quality contractor. So, how can you be sure to choose one? Follow these steps: Find a few good candidates. There are several different starting points… Read more

Michal Johnson is owner of Grout Works Bay Area, a Diamond Certified company. He can be reached at (925) 385-8936 or by email.

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Michal Johnson: A Hands-On Career

By James Florence, Diamond Certified Resource Reporter

ANTIOCH — After working in the petrochemical industry for nearly three decades, Michal Johnson decided to pursue a more hands-on career. “During my 28 years in the petrochemical industry, I traveled a lot and worked in oil refineries all over the nation,” he recounts. “After being transferred to Northern California in the early 2000s, I began thinking seriously about starting my own business. I love working with my hands and had accumulated a lot of home improvement experience from flipping investment properties. I particularly enjoyed working with tile, so that seemed like a good thing to specialize in. I started my own tiling business in 2011 and have been doing it ever since.”

Today, Read more

Expert tip
How to Prevent Soap Scum in Your Shower
ANTIOCH — One of the biggest problems with showers is keeping them clean. Over time, shower tiles accumulate soap scum, which can be hard to remove. What makes soap scum so difficult to deal with is the fact that it… Read more

Jamie Duran is president of Solar Harmonics Inc., a Diamond Certified company. He can be reached at (925) 335-6905 or by email.

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Jamie Duran: A Solar Opportunity

By James Florence, Diamond Certified Resource Reporter

BRENTWOOD — Jamie Duran spent his early career working in an environment that stifled his entrepreneurial spirit, so when he saw an opportunity to start his own business, it was like a ray of sunlight piercing the dark. “Before getting into solar, I worked in finance,” he remembers. “I’ve always been very entrepreneurial, but there’s little opportunity to exercise that trait in the financial world. There are a lot of rules and, worse still, a lot of politics, so it was a constant uphill battle to affect any real, positive change.”

In the mid-2000s, Jamie took notice of an increasing trend toward clean energy, Read more

Expert tip
Energy Saving Tips for Your Swimming Pool
BRENTWOOD — Everyone loves swimming pools, but no one loves the expenses required to maintain them. Between filtration and heating, a swimming pool consumes a lot of energy, which is anything but cheap, especially in California. Fortunately, there are a… Read more

Ehsan Rezaee is owner 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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Ehsan Rezaee: A Clean Opportunity

By James Florence, Diamond Certified Resource Reporter

PETALUMA — Ehsan Rezaee had often dreamed of running his own business, but he never imagined it would be a house cleaning franchise. “My younger brother, Hesam, and I had been talking about starting a business together,” he recounts. “Originally, we thought about running a restaurant franchise, but one day he called and told me about a house cleaning franchise he’d found. I didn’t know anything about house cleaning, but it seemed like a good opportunity and we decided to give it a shot. In 2013, we opened the Sonoma County branch of Molly Maid. It took some time to get fully acquainted with the industry, 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… Read more