The Certification Process






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    Highest in Quality and Helpful Expertise®

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    Researched company reports.
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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...

Diamond Certified Experts: Guidelines for Gardening

Posted on May 14, 2019 by James Florence

Goodbye, April showers…hello, May flowers! As growing season hits its stride in the Bay Area, it’s the perfect time to augment your garden by adding new plants, trees and turf. However, to reap the best results, you’ll need to know how to properly select and sow these materials. To grow your knowledge, read the following tips from Diamond Certified Expert Contributors in the landscaping and tree service industries.

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Posted in: Seasonal, Landscaping Tips

In-Law Suites: A Solution for Multigenerational Households

Posted on May 09, 2019 by Suzanne Carroll

This Mother’s Day, many Americans won’t have to travel far to hug their mothers. That’s because an increasing number of households have several generations living under one roof. For some, grandparents offer much-needed child care for busy, working parents; for other families, it’s reassuring, safer and more cost-effective to have an ailing parent living at home. Read more

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Posted in: Senior Living
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Worse Than Termites? Why Powderpost Beetles Spell Bad News for North Bay Homeowners

Posted on May 07, 2019 by James Florence

Any homeowner in California knows termites are a major concern. Between the native drywood and subterranean species, termites are responsible for millions of dollars’ worth of statewide property damage each year. However, in Northern California, homeowners face an even greater (yet lesser known) pest threat. “The biggest pest problem we currently have in the North Bay Area is the powderpost beetle, which is a wood-boring member of the Lyctinae family,” says Brandy Straub, owner of Redwood Empire Termite & Pest Control in Windsor. “Within the last five years, these beetles are the number one issue I’m finding in homes throughout Sonoma, Marin, Solano and Napa Counties.” Read more

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Posted in: Pest Control

  • Amanda S.

    Verified customer
    Quality 10
    Loyalty Yes
    Helpful expertise Yes

    She's very responsive, really listens to our needs, and she's very friendly. She's personable to the point that we considered her a friend in the process.
    She made the process of buying a home as stress free as it possibly could be. She's professional, organized, and knowledgeable.

    Response to Diamond Certified Company Heidi Hart - California Dreaming Real Estate

  • Gabriel N.

    Verified customer
    Quality 10
    Loyalty Yes
    Helpful expertise Yes

    Nice guy and honest
    They are professional.

    Response to Diamond Certified Company AC Electric


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


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


Ehsan Rezaee: A Clean Opportunity

By James Florence, Diamond Certified Resource Reporter

PETALUMA — Before Ehsan Rezaee moved to the United States from his home country of Iran, he wanted to have a professional career lined up, but he never expected it to be in the house cleaning industry. “My younger brother, Hesam, moved to the U.S. before me, and we 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. 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

Chad Wolffe is CFO of Vulcan Garage Services Inc., a Diamond Certified company. He can be reached at (408) 827-8993 or by email.


Chad Wolffe: A Fitting Career

By James Florence, Diamond Certified Resource Reporter

SAN JOSE — When Chad Wolffe first looked into becoming a garage door technician, he found it was a good fit in more ways than one. “Before I got into garage door service, I was a technician for DirecTV,” he recounts. “One thing I didn’t like about my job was that I always had to access hard-to-reach places. If I wasn’t up on a 40-foot ladder, I was squeezing into a tight crawl space or attic. Being a larger guy, this was a constant struggle. Eventually, I decided to look for a different line of work and put my resume online. Read more

Expert tip
Garage Door Maintenance
SAN JOSE — Like any mechanical device, a garage door has a lot of moving parts that require periodic maintenance. Fortunately, maintenance is pretty simple for a garage door. All you need to do is lubricate its rollers, hinges and… Read more

Ona Hennessey is owner of Hennessey’s Construction and Fence, a Diamond Certified company. She can be reached at (925) 335-6933 or by email.


Ona Hennessey: Building a Livelihood

By James Florence, Diamond Certified Resource Reporter

BRENTWOOD — Like many working mothers, Ona Hennessey once struggled to maintain a balance between career and family. Eventually, she decided the best solution was to build her own livelihood. “I worked for several years at Sierra Lumber and Fence, where, as manager of the retail department, I handled things like sales and ordering materials,” she recounts. “Being a working mom, I always wished I had a little more flexibility with my job, and by the time I was pregnant with my fifth child, I had put a lot of thought into my professional future. With all the experience I’d acquired working for Sierra, Read more

Expert tip
3 Signs That it’s Time to Replace Your Fence
BRENTWOOD — A failing fence can be easy to ignore, but between its important function and the potential risks of failure, it’s an important issue to address. While in some cases it may be possible to repair your fence, in… Read more

Mike Creeden is owner of Marco Roofing, a Diamond Certified company. He can be reached at (925) 405-5996 or by email.


­­Mike Creeden: A Twofold Education

By James Florence, Diamond Certified Resource Reporter

FREMONT — During his college years, when Mike Creeden wasn’t studying for his classes, he could often be found working on a rooftop. What he didn’t realize was that both activities were preparing him for his future career. “While earning my degree in business administration, I worked for my uncle’s roofing business on the side,” he remembers. “After I finished college, my uncle asked me to run his company for him. It was the best opportunity I had at the time, and between my college degree and my roofing experience, I was qualified for the job, so I took it.”

Five years later, Read more

Expert tip
The Proper Way to Walk on a Tile Roof
FREMONT — Whether to hang Christmas lights, wash upper-story windows or retrieve a wayward ball lost by the neighborhood kids, it’s inevitable that you’ll need to get up on your roof at some point. Naturally, safety should be your main… Read more

Cory Wikstrom is secretary of Vulcan Garage Services Inc., a Diamond Certified company. He can be reached at (408) 827-8993 or by email.


Cory Wikstrom: Working in Doors

By James Florence, Diamond Certified Resource Reporter

SAN JOSE — Starting in his early 20s, Cory Wikstrom has spent nearly his entire professional career working in doors—garage doors, specifically. “Right out of high school, my younger brother got a job with a garage door company owned by his friend’s family,” he remembers. “It seemed like a good job, so I decided to apply and got hired. I spent the next eight years there before moving on and working for a few other garage door companies.”

Eventually, Cory started talking with his friend/co-worker Chad Wolffe about starting their own garage door business. However, one element was still missing. Read more

Expert tip
Making the Most of Your Replacement Garage Door
SAN JOSE — When purchasing a replacement garage door, smart choices can help you make the most of your investment. Here are a few tips: Consider money-saving alternatives. A high-end, carriage-style wood door can cost more than $10,000. For a… Read more

Michael Fahey is CEO of Vulcan Garage Services Inc., a Diamond Certified company. He can be reached at (408) 827-8993 or by email.


Michael Fahey: Garage Door Guru

By James Florence, Diamond Certified Resource Reporter

SAN JOSE — When Michael Fahey answered an ad for a management position, he had no idea where it would lead him…especially because it didn’t specify the industry. “It was just a generic ad placed by an owner looking for someone to run his company for him,” he recounts. “It wasn’t until later that I found out it was a garage door company. With my background in sales, marketing and home improvement, I had all the qualifications the owner was looking for, so I decided to give it a shot.” In 2018, nearly a decade later, Michael took the knowledge and experience he’d accumulated and started an independent garage door service company with partners Cory Wikstrom and Chad Wolffe. Read more

Expert tip
The Benefits of a Wi-Fi Enabled Garage Door
SAN JOSE — One upgrade all homeowners should consider is converting to a Wi-Fi enabled garage door. Incorporating Wi-Fi into your garage door’s motor will allow you and your family members to open and close the door from a smartphone… Read more

David Drowty is president of Top Priority Roofing, Inc., a Diamond Certified company. He can be reached at (707) 659-6987 or by email.


David Drowty: A Professional Priority

By James Florence, Diamond Certified Resource Reporter

ARBUCKLE — When David Drowty started working as a roofer in his late 20s, he thought he was just getting into a trade, but it was actually the beginning of something bigger. “Initially, I saw roofing as just another job—a step up from my prior job working at Costco, but nothing particularly life-changing,” he recounts. “However, I ended up developing a real passion for both the work itself and the customer service side. I also began to develop a vision for starting my own roofing company. I’d worked with a lot of different contractors, and in most cases I felt I could do a better job taking care of customers. Read more

Expert tip
Understanding the Roof Replacement Process
ARBUCKLE — When it comes to replacing a roof, many homeowners are unfamiliar with the process. To get some clarification, read the following step-by-step overview. 1. First, the homeowner must request bids from one or more roofing contractors. Once a… Read more

Brandy Straub is owner of Redwood Empire Termite & Pest Control, a Diamond Certified company since 2011. He can be reached at (707) 654-4593 or by email.


Brandy Straub: Dirty Work

By James Florence, Diamond Certified Resource Reporter

WINDSOR — Born into a family of pest control professionals, Brandy Straub cut his teeth doing the dirty jobs no one else wanted to do before expanding his career horizons. “My grandfather started Redwood Empire Termite & Pest Control in 1946,” he recounts. “My father got involved in the business when he was 15 years old, and I started even younger, working after school, on weekends and during summer vacations. Of course, they had me do all the dirty work they didn’t want to do, like going underneath houses and cleaning up rodent remains. Eventually, I got tired of doing that, Read more

Expert tip
The Importance of Professional Termite Inspections
WINDSOR — Like most people, you probably take a preventative approach to checking up on your car, your teeth, and other crucial aspects of your daily life and health. However, even if you’re proactive about these things, there’s another crucial… Read more

Moshe Spund is owner of FixEm Appliance Repair, a Diamond Certified company. He can be reached at (925) 386-6928 or by email.


Moshe Spund: Assembling a Livelihood

By James Florence, Diamond Certified Resource Reporter

OAKLAND — As a kid, Moshe Spund enjoyed taking things apart and reassembling them, but he never thought he’d one day make a career out of it. “I’ve always had an interest in knowing how things work,” he affirms. “To me, it’s like a puzzle. If something isn’t working right, I enjoy the challenge of figuring out what’s causing it and how to repair it. Still, I never considered a career in appliance repair until I saw an online job listing. When I went in for the interview, I was skeptical, but once I started, I fell in love with the trade.”

In 2018 (roughly five years after he started as an appliance repair technician), Read more

Expert tip
An Important Dryer Maintenance Measure
OAKLAND — Have you noticed that your dryer isn’t working as well as it used to? Is it taking longer to dry your clothes? Is your dried laundry full of loose lint? Believe it or not, these issues can all… Read more

Renato do Carmo is president of D’Carmo Interlocking Pavers, Inc., a Diamond Certified company. He can be reached at (510) 972-4977 or by email.


Renato do Carmo: Piecing it All Together

By James Florence, Diamond Certified Resource Reporter

RICHMOND — For Renato do Carmo, progressing from trainee to expert in the paver industry was simply a matter of piecing it all together. “I got into the paver industry through friends,” he recounts. “I started as a helper and gradually learned the trade until I became an installer. After working for a couple of companies, I began working as a subcontractor as part of a partnership I formed with some other industry professionals. When the partnership ended in 2017, I decided to take the years of experience I’d accumulated and start my own paver installation company.”

Today, Read more

Expert tip
Paver Restoration: A Cost-Effective Alternative to Replacement
RICHMOND — If your paver patio or driveway is showing signs of age, you probably assume you need to have it replaced. However, did you know there’s an alternative option that can restore the beauty of your paver feature for… Read more

Natan Framowitz is owner of FixEm Appliance Repair, a Diamond Certified company. He can be reached at (925) 386-6928 or by email.


Natan Framowitz: Unlocking Potential

By James Florence, Diamond Certified Resource Reporter

OAKLAND — Natan Framowitz might never have known he had a talent for appliance repair were it not for the encouragement of a close friend. “Around 2014, my longtime friend, Mo, started doing appliance repairs and convinced me that I should join him in the field,” he recounts. “I was hesitant at first—the idea of people relying on me to fix their appliances was a bit intimidating. But soon after I started, I realized I had a knack for it. I found I was able to fix things that other technicians couldn’t, and it basically became second nature.”

In 2018, Read more