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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®. Companies must score 90+ on a 100 scale and pass all our credential-based ratings. By requiring such a high score to qualify, we cut out mediocre and poorly performing companies. Only the Best Pass the Test®.
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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.

The Diamond Certified Difference

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.

We’re Here for You

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.

Only the Best Pass the Test®

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: Home Troubleshooting Tips

Posted on September 15, 2020 by James Florence

When your furnace, dryer or garbage disposal stops working, your first instinct may be to call a professional. In some cases, however, all it takes is a little troubleshooting to avoid an expensive service call. We asked five Diamond Certified Expert Contributors to share their home troubleshooting tips. Read more

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Posted in: Diamond Certified Experts, Home Tips

Firescaping Your Property

Posted on September 08, 2020 by Suzanne Carroll

The Bay Area has already seen numerous destructive wildfires in 2020, and there are still several weeks of hot, dry weather ahead of us. As wildfires become an increasingly common threat to the region, many homeowners are turning to “firescaping,” which is the coordinated use of fire-resistant plants and building materials around the home. With the right plants and hardscaping features, you can make it harder for wildfire to take hold and spread. Firescaping is a type of landscaping, which means you still have many options to create a garden that reflects your personal style. Aside from improving safety and adding beauty, firescaping can increase the value of your home. Read more

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Posted in: Fire Prevention, Uncategorized
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5 Tips for Efficient Lawn Irrigation

Posted on September 01, 2020 by James Florence

Known for their excessive water consumption, grass lawns tend to get a bad rap these days. However, this judgment isn’t entirely fair. The truth is most turf grasses only need about one inch of water per week to maintain their color and active growth. So, why the bad reputation? Perhaps it’s time to shift the blame from the lawns themselves to those responsible for watering them. After all, a lot of home and property owners waste water by not following efficient irrigation practices. To ensure you’re doing all you can to conserve water with your lawn, read these helpful guidelines: Read more

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Posted in: Water Conservation, Home Tips, Landscaping Tips

LATEST PHONE SURVEY RESPONSES FROM VERIFIED CUSTOMERS
  • Jesus S.

    Verified customer
    Quality 10
    Loyalty Yes
    Helpful expertise Yes
    Critique

    They're very detailed.
    They're thorough, quick, and detailed.

  • Blanche F.

    Verified customer
    Quality 10
    Loyalty Yes
    Helpful expertise Yes
    Critique

    He's dependable, very knowledgeable about his projects, and the job we had him do for us.
    I liked that he finished the job correctly and in a timely manner.

    Response to Diamond Certified Company Michal Gerard Construction

THIS WEEK’S FEATURED DIAMOND CERTIFIED EXPERT CONTRIBUTIONS

Sandy Willis is president of Molly Maid of S. Silicon Valley, a Diamond Certified company. She can be reached at (408) 763-3556 or by email.

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Sandy Willis: Entrepreneurial Aptitude

By James Florence, Diamond Certified Resource Reporter

SAN JOSE — Sandy Willis has always had a penchant for entrepreneurship. Even in the midst of an economic recession, she was able to find a diamond in the rough. “Back in 2009, my husband, Bill, and I were looking to buy a business that had positive cash flow,” she recounts. “We’ve been entrepreneurs for quite some time—prior to that point, we’d owned three different coffee shops and sold them. We came across a Molly Maid franchise in San Jose and it met our criteria, so we bought it. About three years later, the owner of the neighboring franchise in Cupertino/Saratoga wanted to sell, Read more

Expert tip
How to Properly Disinfect a Surface
SAN JOSE — When disinfecting surfaces inside the home, many people simply spray a disinfectant product on the surfaces and wipe them with a cloth. However, this neglects an important part of the process. Before applying disinfectant to… Read more

David Liu is office manager of Anita’s Housekeeping Referral Agency, a Diamond Certified company. He can be reached at (831) 296-2832 or by email.

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David Liu: The Matchmaker

By James Florence, Diamond Certified Resource Reporter

APTOS — David Liu has been working in the house cleaning industry for some time, but it was only recently that he discovered a better way to match clients with the services they need. “While working for a house cleaning company, I saw a demand in the marketplace from clients looking for more customized services,” he recounts. “Most cleaning companies have a lot of do’s and don’ts—for example, some don’t do laundry or dishes. This makes it hard to find a one-size-fits-all solution for every client’s needs and expectations. So, when I came across Anita’s Housekeeping Referral Agency, I was impressed by their approach. Read more

Expert tip
Setting Your Housekeeper Up for Success
APTOS — When a homeowner is dissatisfied with their house cleaning service, it’s often due to a lack of communication. That’s why, after hiring a new housekeeper, we recommend taking the time to set clear expectations at the… Read more

Savi Singh is general manager of Auto Collision Experts, a Diamond Certified company. He can be reached at (408) 758-5704 or by email.

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Savi Singh: Career Cultivation

By James Florence, Diamond Certified Resource Reporter

SUNNYVALE — Growing up in Punjab, India, Savi Singh was always interested in working on cars. However, it wasn’t until he immigrated to the United States that he cultivated that interest into a full-fledged career. “I immigrated to the U.S. in 2003, just before my 18th birthday,” he remembers. “My father had already immigrated a couple of years prior and applied for my mom, my brothers, and I to come join him. I couldn’t attend college during that first year because I hadn’t yet received my green card. So, I started helping my father, who had just opened an auto body shop in Hayward called ASM Auto Body. Read more

Expert tip
Reviewing Your Auto Insurance Coverage Options
SUNNYVALE — One mistake many vehicle owners make is overlooking their auto insurance coverage options. A lot of people just go with the most basic coverage, but there are several additional options that can benefit policy holders. One… Read more

Steve Daniel is president of Steve Daniel Construction Inc., a Diamond Certified company. He can be reached at (916) 229-9554 or by email.

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Steve Daniel: Born to Build

By James Florence, Diamond Certified Resource Reporter

SACRAMENTO — Raised in the construction trades, Steve Daniel was all but destined to become a builder like his forefathers. “My dad was a contractor and so was my grandfather, so it’s in my blood whether I like it or not,” he laughs. “By the time I was 13, my dad was taking me out on jobs regularly. He worked all the time and always needed help, and who do you think he was going to call to help him? That strapping young man sitting on the couch watching cartoons, that’s who!”

Following high school, Steve attended college, Read more

Expert tip
Having the Right Motivation With Remodeling
SACRAMENTO — When planning for a home remodeling project, it’s important to reflect on your motivation. Otherwise, you may end up making decisions that you later regret. For example, a lot of homeowners get caught up in following… Read more

Curt Glaze is showroom manager of California Custom Carpets, a Diamond Certified company. He can be reached at (510) 984-3688 or by email.

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Curt Glaze: A Perfect Fit

By James Florence, Diamond Certified Resource Reporter

DUBLIN — Between his professional and personal experience, Curt Glaze found a career in flooring sales to be a perfect fit. “Before getting into flooring, I worked as a program manager for Hewlett-Packard,” he recounts. “I’ve always liked working with people. Personally, I also did a lot of remodeling on my home and always enjoyed the design aspects of it. So, when I decided to switch careers, I found that flooring sales was a good fit. Over the years of working in the industry, I’ve encountered everything from small fixer-upper homes to big-budget luxury remodeling projects, so when someone walks into the store, Read more

Expert tip
The Truth About Engineered Hardwood Floors
DUBLIN — When it comes to wood flooring, many consumers have a perception that engineered hardwood is inferior to solid hardwood. In reality, that’s not at all the case. To learn more, let’s do a side-by-side comparison to… Read more

Mariano Renteria is owner of Falcon Roofing, a Diamond Certified company. He can be reached at (408) 713-0389 or by email.

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Mariano Renteria: No Place Like Home

By James Florence, Diamond Certified Resource Reporter

SAN JOSE — After leaving his family’s trade to pursue a different career, it didn’t take long for Mariano Renteria to realize there’s no place like home. “After high school, I did a little bit of roofing, but I wasn’t sure it was for me,” he remembers. “There were a lot of roofers in my family, so it made sense to follow in their footsteps. However, I wanted to try something different, so I became a truck driver. I liked it at first, but after a while I grew tired of being on the road for weeks at a time. Read more

Expert tip
Attic Ventilation: A Crucial Aspect of Roof Replacement
SAN JOSE — A crucial aspect of any roof replacement project is ensuring proper attic ventilation. In fact, all roofing warranties stipulate that the attic must be vented properly, which means if yours isn’t, you could lose out… Read more

Lior Zeevi is president of Insulation Guru Inc. dba HVAC Guru, a Diamond Certified company. He can be reached at (408) 763-3543 or by email.

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Lior Zeevi: East to West

By James Florence, Diamond Certified Resource Reporter

SAN JOSE — After starting his HVAC career on the East Coast, Lior Zeevi decided to pack up and head west. “I began my HVAC career in 2003 while I was living in Miami, Florida,” he recounts. “What drew me to the industry was an interest in the science of HVAC, particularly air conditioning. Pretty much everyone has air conditioning in Florida, so there was plenty of work, and I ended up opening my own HVAC company. In 2012, I sold that business and moved to the Bay Area, where I started a new company.”

As he became more familiar with his new environment, Read more

Expert tip
Air Conditioning System Maintenance
SAN JOSE — When properly installed, a home air conditioning system should last for at least 20 years. However, in order for the system to reach its expected lifespan, ongoing maintenance must be observed. In addition to prolonging… Read more

Michael Davis is president of Davis Roofing Group, a Diamond Certified company. He can be reached at (916) 229-6192 or by email.

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Michael Davis: A Long Way to the Top

By James Florence, Diamond Certified Resource Reporter

GALT — Michael Davis has been in the roofing trade since he was a teenager. Looking back, he credits his early initiation to a family friend in the industry. “My godfather owns a roofing company,” he recounts. “My dad and my brother both worked for him, so naturally I ended up there as well. I was 14 years old when I started and that’s where I received all my training. Basically, I fell in love with the trade and I’ve been involved ever since.”

More than two decades after beginning his career, Michael finally made the transition from employee to owner. Read more

Expert tip
Save Money by Maintaining Your Roof
GALT — Roof maintenance is one of the best ways for homeowners to save money over time. After all, it’s a lot easier and less expensive to maintain a roof than it is to replace one. And when… Read more

Mike Im is president of Im Roofing Company, a Diamond Certified company. He can be reached at (415) 878-3187 or by email.

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Mike Im: An Early Start

By James Florence, Diamond Certified Resource Reporter

PACIFICA — Mike Im’s roofing career got off to an early start thanks to a family member who worked in the industry. “I got into roofing because of my uncle, who had his own roofing company,” he explains. “I was fortunate to learn the process of roof installation at a young age. At first, I mainly worked with my uncle during summers, but after I turned 18, I began doing it full time. I became very focused on refining my skills and knowledge, and within three years, I teamed up with my dad to open our own roofing business. Read more

Expert tip
Roofing Shingle Warranties: What You Need to Know
PACIFICA — In the past, roofing shingles were warrantied for a set number of years depending on their quality grade. For example, you could get a “30-year shingle” or a “40-year shingle.” More recently, the industry has shifted… Read more

Maor Greenberg is the owner of Greenberg Construction, a Diamond Certified company. He can be reached at (650) 206-2869 or by email.

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Maor Greenberg: Building Anew

By James Florence, Diamond Certified Resource Reporter

PALO ALTO — After running a successful construction firm in his home country of Israel, Maor Greenberg moved to the United States, where he immediately set to work building a new enterprise. “I started my first construction company when I was 19 years old,” he recounts. “I come from a family of contractors, including my father, so I started when I was very young in the industry. In 2013, my wife and I decided to move to the United States, which is where she’s originally from. Shortly after we arrived, I got my contractor’s license and started a new company.”

Today, Read more

Expert tip
Planning Your Remodel in Reverse
PALO ALTO — When planning for a home remodel, most homeowners assume they should start by getting architectural drawings. However, I’m going to suggest something radical: start at the end of the process and work backward. Specifically, I… Read more

Liliana Reyes-Avalos is owner of The Magic Mop, Inc., a Diamond Certified company. She can be reached at (510) 992-4011 or by email.

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Liliana Reyes-Avalos: A Pathway to Opportunity

By James Florence, Diamond Certified Resource Reporter

CASTRO VALLEY — Upon moving to the United States from Mexico, Liliana Reyes-Avalos faced an unexpected career setback. However, while it required her to start over from scratch, she soon found herself on a pathway to opportunity. “I used to be a preschool teacher before I came to the U.S.,” she recounts. “When I came here in 1996, I had hoped to continue teaching, but there were complications. Not only did I have trouble with the language barrier, my teaching certification in Mexico wasn’t transferable. Also, I’d just had a baby, so I decided to find a different line of work. Read more

Expert tip
Preventing Damage to Stone Countertops
CASTRO VALLEY — Countertops made of natural stone like granite or marble are certainly beautiful, but without proper care, they may not stay that way for long. One thing some homeowners overlook regarding stone countertops is the damage… Read more

Joel Gruber is owner of Gruber Painting, a Diamond Certified company. He can be reached at (650) 741-0231 or by email.

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Joel Gruber: Choosing a Focus

By James Florence, Senior Writer

SAN JOSE — After years of splitting his livelihood between two seasonal jobs, Joel Gruber came to a point where he had to choose between a paintbrush and a snowboard. “Over a six-year period following high school, I worked two jobs,” he explains. “During the summer, I was a painter, and during the winter, I was a ski lift operator up at Squaw Valley. It was an awesome time. Eventually, however, I realized I needed to choose a focus. Ultimately, I chose to go with painting. Since I had a lot of experience, I decided my best move would be to start my own business. Read more

Expert tip
Choosing the Right White for Your Trim
SAN JOSE — When it comes to choosing interior paint, most homeowners tend to focus on wall and accent colors, but it’s also important to consider trim color. Although trim is generally white, choosing the right hue of… Read more