GGGGGG
The Certification Process

?

HELP

Connect

Connect

  • BY PHONE

    (800) 555-1212

  • BY EMAIL

    [email protected]

SIGN UP

SIGN UP

  • Benefits
    • Upgrades to Reduce Your Home’s
    • Upgrades to Reduce Your Home’s
    • Upgrades to Reduce Your Home’s
  • Sign Up
  • Accurate Ratings

    Local companies rated
    Highest in Quality and Helpful Expertise®

  • Performance Guaranteed

    Contract Performance Guaranteed
    Backed by Mediation

  • Deep Info™

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

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®. 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®.
Shares

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.

Save

Save

Read moreRead Less
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: Designing Your Remodel

Posted on January 19, 2021 by James Florence

Are you ready to remodel your home? Before you knock down any walls, you’ll need to figure out your design. What style are you aiming for? What are your aesthetic and functional requirements? What kinds of products do you want to incorporate? These are all important questions that need to be answered before the building can begin. To help you find the answers, we’ve asked six Diamond Certified Expert Contributors to provide their professional insights on remodeling design. Read more

Share
Leave a comment

Posted in: Home Remodeling

Appliances: When to Repair and When to Replace

Posted on January 14, 2021 by Suzanne Carroll

We rely on our household appliances to make life easier. So, when your dishwasher no longer rinses as well as it used to or your stove top won’t turn on, your efficiently run home can screech to a halt. Determining whether to repair or replace a broken appliance can be tricky. In this article, you’ll find some guidelines to help you decide whether to call a local appliance repair technician or head to an appliance showroom to find something new.  Read more

Share
Leave a comment

Posted in: Appliances
Tags: , ,

The 2021 Winter Diamond Certified Directory Update is Here!

Posted on January 12, 2021 by Matt Solis

Have you received your free copy of the 2021 Winter Diamond Certified Directory Update in the mail? It provides instant access to hundreds of local, top rated Diamond Certified companies across a wide range of service industries, from auto repair and landscaping to optometry and dentistry.

Every Diamond Certified company must continue to deliver on its promises to you, the consumer. That’s why we conduct ongoing customer satisfaction research, perform credential-based ratings, monitor each company’s performance, and back you up with mediation and the Diamond Certified Performance Guarantee. Read more

Share
Leave a comment

Posted in: Press Releases, Consumers, Diamond Certified News
Tags: , , ,

What to Do About Soil Erosion

Posted on January 07, 2021 by Suzanne Carroll

California’s steep terrain and forceful winter rainstorms make soil erosion and landslide risk a yearly threat to homes. After months of bone-dry conditions, strong storms can quickly alter hillside terrain. While soil erosion is an inherently natural process, homeowners can take steps to reduce the negative effects erosion may have on their properties.  Read more

Share
Leave a comment

Posted in: Hardscaping, Landscaping Tips
Tags: , ,

LATEST PHONE SURVEY RESPONSES FROM VERIFIED CUSTOMERS
  • Monique M.

    Verified customer
    Quality 10
    Loyalty Yes
    Helpful expertise Yes
    Critique

    Craftsmanship, all the guys are very knowledgeable and really know what they are doing. You can tell they put their all into the craftsmanship.
    Our roof looks great. I love it. We get compliments on it.

    Response to Diamond Certified Company Mid-Peninsula Roofing Inc.

  • M. P.

    Verified customer
    Quality 10
    Loyalty Yes
    Helpful expertise Yes
    Critique

    Go ahead and go with them because their prices are good and competitive and they do a good job.
    Their prompt service and their good attitude

    Response to Diamond Certified Company Quilici Gardening

THIS WEEK’S FEATURED DIAMOND CERTIFIED EXPERT CONTRIBUTIONS

Jose Calderon is owner of Diamond Image Pool Service, a Diamond Certified company. He can be reached at (707) 219-8326 or by email.

Shares

Jose Calderon: Diving Back In

By James Florence, Diamond Certified Resource Reporter

VACAVILLE — After taking a brief detour from his pool service career, Jose Calderon decided to dive back in and go deeper than ever before. “My first pool service job was with a company in San Jose,” he recounts. “Jim, the owner, was like the Mr. Miyagi of pool service and taught me everything I know about chemistry and maintenance. Later, when I took a job selling cars, I gave my position to my younger brother, Christopher, who ended up starting his own pool service business in Sacramento. A few years after that, I was thinking about starting a pool service business myself, Read more

Expert tip
Three Aspects of Pool Maintenance
VACAVILLE — To get the most enjoyment out of your swimming pool, you’ll need to keep it maintained. Here are three crucial aspects of pool maintenance:   1. Chemistry “Chemistry” refers to chemicals that are added to the… Read more

Eric Zugnoni is owner of Antioch Napa Auto Care, a Diamond Certified company. He can be reached at (925) 257-4631 or by email.

Shares

Eric Zugnoni: A Student of the Industry

By James Florence, Diamond Certified Resource Reporter

ANTIOCH — Most auto mechanics attend ongoing educational courses, but few can be classified as true students of the industry. Eric Zugnoni falls into this classification, and his educational enthusiasm is a big part of what propelled him to professional success. “During my early years as a technician, I attended a lot of industry-related classes,” he says. “I heard about a teacher in Concord who was highly recommended, so I started attending his classes on topics like advanced drivability and emissions. He became a mentor to me, and when I was laid off by Bank of America, Read more

Expert tip
An Unintended Consequence of Extended Oil Change Intervals
ANTIOCH —As automotive technology continues to evolve, vehicle maintenance needs are changing as well. One of the biggest examples of this is oil change intervals. For many years, the standard oil change interval was 3,000 miles, but the… Read more

Miquan Johnson is owner of Johnson’s Insulation, a Diamond Certified company. He can be reached at (925) 335-6956 or by email.

Shares

Miquan Johnson: An Insulation Fascination

By James Florence, Diamond Certified Resource Reporter

OAKLAND — Miquan Johnson had already started down his career path when a unique opportunity led to a permanent change in direction. “I initially started my career in the construction field, where I learned how to do framing and electrical work,” he recounts. “Later, while attending college, I was offered a job doing insulation upgrades for low-income families through a government program. We would go in and reinsulate the walls, attic, and crawl space at no charge to the homeowner. It was really rewarding work, and it sparked an interest in insulation and its impact on energy efficiency. I’ve been doing insulation ever since, Read more

Expert tip
Improving Insulation in a Drafty Home
OAKLAND — Is your home drafty? Do you have trouble maintaining a consistent comfortable temperature throughout? If so, you may be thinking about replacing your HVAC system with something more powerful. However, this would be a mistake. In… Read more

Peter Freeman is COO of Good Green Moving, a Diamond Certified company. He can be reached at (415) 649-6433 or by email.

Shares

Peter Freeman: Moving it Forward

By James Florence, Diamond Certified Resource Reporter

PETALUMA — Peter Freeman has always been interested in business and innovation, so when he got the chance to work for a cutting-edge enterprise, he was all in. “I joined Good Green Moving when I was still in college,” he says. “I was majoring in economics and applied mathematics, with the hopes of starting my own business when I finished. I got connected with Jonathan Cook, the company owner, through my mom, who is a real estate agent. His company was doing a lot of innovative things with data and software to improve efficiency and environmental sustainability in the moving industry. Read more

Expert tip
Drawbacks of Moving Long Distance With a Van Line
PETALUMA — Any move can be difficult, but when it comes to scale and complexity, long-distance moving is in a league of its own. Transporting your household goods from California to another state is a massive endeavor that… Read more

Ian Hlinka owner of IMH Construction, Inc., a Diamond Certified company. He can be reached at (707) 829-3779 or by email.

Shares

Ian Hlinka: Slow and Steady Success

By James Florence, Diamond Certified Resource Reporter

SEBASTOPOL — After 25 years in the construction business, Ian Hlinka looks back on his gradual progression from apprentice to owner of a sizeable firm. “I’ve been in construction since I was 16,” he says. “My father-in-law got me a job building tract homes with a general contractor, where I learned to do framing. I continued to do framing for seven years or so, then I started working for a developer building custom homes and commercial buildings in Petaluma. In 2004, he was starting to get out of the business, so I decided to get my license and go out on my own. Read more

Expert tip
Planning Your Construction Project
SEBASTOPOL — A crucial aspect of planning a construction project is researching and choosing finishing products like countertops, appliances, flooring, cabinetry, and plumbing fixtures. To ensure product availability and timely delivery, it’s best to choose and order these… Read more

Chih Ling Han is president of Acme Sunshades Enterprise Inc., a Diamond Certified company. He can be reached at (510) 992-4017 or by email.

Shares

Chih Ling Han: From Software to Sunshades

By James Florence, Diamond Certified Resource Reporter

HAYWARD — After investing a decade into a steady career in software, Chih Ling Han took a radical leap of faith and dove headfirst into an unfamiliar industry. More than a decade later, he has no regrets. “After 10 years working as a software engineer, I realized that I wanted to be my own boss and run my own company,” he recounts. “However, I didn’t want to start from scratch and found a brand-new company, so I decided to buy an established one. In 2009, I acquired Acme Sunshades Enterprise. Since I didn’t have any prior experience in the sunshade industry, Read more

Expert tip
Awning Options
HAYWARD — When it comes to exterior shade solutions, awnings are a common choice for home and business owners. When choosing an awning, it’s important to be aware of your options, including fabric and metal designs. Here’s some… Read more

Matthew Iribarne is head of glazing operations at B & L Glass, a Diamond Certified company. He can be reached at (707) 308-4875 or [email protected]

Shares

Matthew Iribarne: In His Element

By James Florence, Diamond Certified Resource Reporter

SANTA ROSA — Not long after ascending to upper management at an established glass company, Matt Iribarne realized he belonged in the field rather than in an office. “My grandfather had a glass business and I got involved at a young age,” he explains. “Right out of high school, I joined a union, went through an apprenticeship program, and worked in the field for 18 years before moving into estimating and project management. Eventually, I became vice president of the company.” However, despite reaching an upper rung on the proverbial ladder of success, Matt couldn’t help but feel he’d lost something along the way. Read more

Expert tip
Five Factors for Glass Selection
SANTA ROSA — When selecting glass products for a home or building, considering these five factors will help you make an informed choice: 1. Climate control Tinted and low-E coated glass products reduce heat transfer from the outside,… Read more

Marco Vargas is co-owner of D A Reed Plumbing Company, a Diamond Certified company. He can be reached at (510) 402-5632 or by email.

Shares

Marco Vargas: Plumbing Pride

By James Florence, Diamond Certified Resource Reporter

LIVERMORE — When Marco Vargas got hired as a laborer for a local plumbing company, he had no idea just how far this initial step would take him. “In 2005, I got the opportunity to do some work for a local plumber who had a big project going,” he recounts. “I ended up staying with the company, and over time, I moved up through the ranks. Eventually, there came a point when I was basically running the whole operation. When the owner, David Reed, saw how well the company was doing under my watch, he decided to make me co-owner. Read more

Expert tip
How to Maximize Your Water Heater’s Lifespan
LIVERMORE — The average lifespan of a conventional water heater is eight to 12 years. To maximize your water heater’s lifespan, take the following maintenance steps: 1. Flush the tank. By removing sediment buildup on the bottom of… Read more

Ruben Cordova is owner of Cordova Construction, a Diamond Certified company. He can be reached at (408) 782-4926 or by email.

Shares

Ruben Cordova: A Window of Opportunity

By James Florence, Diamond Certified Resource Reporter

SAN JOSE — When Ruben Cordova started installing windows early in his construction career, he didn’t know he was laying the framework for a much bigger opportunity to come. “I started working construction when I was 18 years old,” he remembers. “The first company I worked for was a general contractor, where I got experience with all aspects of home construction. A year later, I went to work for a window company and was given the opportunity to monitor a crew. In 2001, I moved to San Jose, where I continued to install windows. My customers noticed the level of attention I gave to the job, Read more

Expert tip
An Alternative Approach to Planning a Remodel
SAN JOSE — When planning for a remodel, homeowners often start by looking at cost and let that dictate the form the project takes. While this may be a financially prudent approach, it can also limit the project’s… Read more

Eric Schaefer is a comfort control specialist at Got Watts Electric, Solar & HVAC, a Diamond Certified company. He can be reached at (925) 268-0666 or by email.

Shares

Eric Schaefer: A Double Livelihood

By James Florence, Diamond Certified Resource Reporter

CONCORD — Until fairly recently, Eric Schaefer was living what some might call a double livelihood, playing an active role in two disparate professional spheres. “I worked as a service director for Porsche for many years while simultaneously pursuing a construction career on the side,” he explains. “My grandfather was a general contractor and a real estate developer, so I got my passion for working on houses from him. In the late ’90s, I started dabbling in heating and cooling as a specialty. Over the following decade, I became more active in the trade, and in 2013, I left my job at Porsche to pursue full-time work as a residential climate control specialist.”

In 2010, Read more

Expert tip
Maintaining Your Air Filters
CONCORD — In California, indoor air quality has taken on a new level of importance due to the annual recurrence of wildfires. With all the smoke and ash in the atmosphere, you need to make sure your air… Read more

Terry Barkai is Business Operations Manager of 911 Remediation LLC dba 911 Restoration, a Diamond Certified company. He can be reached at (925) 750-8660 or by email.

Shares

Terry Barkai: A Restorative Career

By James Florence, Diamond Certified Resource Reporter

RICHMOND — Terry Barkai used to build new structures for a living, but today his career is all about restoring damaged ones. “Before working in the restoration industry, I was in general construction,” he affirms. “I met Erez Gilad, the owner of 911 Restoration, and we had a good connection. Not long after, I went to work for him. With all that was happening with the wildfires in California, fire damage restoration really interested me, much more so than general construction. I figured I could really excel in an industry that interested me, so I decided to give it a shot.”

Today, Read more

Expert tip
Fire Damage Restoration Procedure
RICHMOND — During the past few years, wildfires have become an increasing concern in California. In 2020 alone, more than four million acres were burned statewide, along with more than 10,000 structures. If your home was affected by… Read more

Steven Romero is owner of Terranova Construction, a Diamond Certified company. He can be reached at (415) 523-5726 or by email.

Shares

Steven Romero: Determined to Succeed

By James Florence, Diamond Certified Resource Reporter

NOVATO — Steven Romero started a contracting firm at an age when most construction professionals are still cutting their teeth. While at times he worried he was in over his head, he stayed the course and was met with success. “I’ve been in construction since I was 18,” he explains. “My dad used to be a contractor, so I started out working for him. In 2010, I started Terranova Construction. I was only 23 at the time, so it was a lot to take on at such a young age. However, I was determined to succeed, so I met the challenges, Read more

Expert tip
A Worthwhile Investment for Bathroom Retiling
NOVATO — If you’re retiling your bathroom, consider installing an underlayment such as Schluter®-DITRA waterproofing membrane. This orange-colored polyurethane sheeting is installed beneath the tilework to protect the subfloor from moisture intrusion. When moisture is able to penetrate… Read more