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  • Accurate Ratings

    Local companies rated
    Highest in Quality and Helpful Expertise™

  • Performance Guaranteed

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  • Deep Info™

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


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...

(Almost) Everything You Need to Know About Tire Care

Posted on August 14, 2018 by James Florence

Want to get the most out of your vehicle’s tires? Of course you do. However, you may not realize all that this entails in terms of ongoing care and maintenance. To help you, we’ve created this comprehensive, “rubber meets the road” guide to tire care. In it, we’ll cover the following aspects:

  • Why tire care is important
  • Maintaining proper tire pressure
  • Rotating your tires
  • Wheel alignment and balance
  • Tire repair
  • Knowing when to replace your tires
  • Read more

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Posted in: Automotive

Best Practices for Giving Feedback to a Company

Posted on August 13, 2018 by Joy Lanzaro

Delivering feedback to a company is like landing an airplane on an old runway—it can be bumpy or smooth depending on how much work has been put into maintaining the area. Without the proper approach, asking a company if you can give some feedback can prompt a defensiveness that redirects your desired change into the weeds.

Unfortunately, some people’s definition of “feedback” is simply venting without consideration of the receiver’s good intentions. On the other hand, accurate and timely consumer feedback can be a company’s free ticket to a competitive advantage in the market. Read more

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Posted in: Uncategorized, Consumers, Customer Service

Specialty Spotlight: Move-In/Move-Out Cleaning

Posted on August 09, 2018 by Suzanne Carroll

When moving out of your home or apartment, you’re likely more focused on your new place than your old one. But before locking up for the last time, you’ll need to make sure everything is in good order for the next occupants. That’s where move-in/move-out cleaning services come in. In this piece, we’ll cover what move-in/move-out cleaning entails and why you may want to use such a service for your next move.


What is Move-In/Move-Out Cleaning?

Move-in/move-out cleaning is a specialized cleaning service that aims to remove dust and dirt from a home after the owners or tenants have moved out. It’s similar to deep cleaning in terms of thoroughness, Read more

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Posted in: House Cleaning, Moving
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Tips for Weathering a Bay Area Heat Wave

Posted on August 02, 2018 by James Florence

One of the major perks of living in the Bay Area is its mild year-round climate. However, despite the typically moderate conditions, Bay Area residents are not wholly unfamiliar with extreme weather. Take the heat wave that hit during Labor Day weekend in 2017, which left San Francisco smoldering at a historic high of 106 degrees Fahrenheit. Likewise, the summer of 2018 has brought at least one heat wave, with triple-digit temperatures recorded in several Bay Area cities from June 22 to June 24.

While such instances of extreme heat are far from the norm, their sporadic nature makes it all the more important to be prepared for them. After all, if you aren’t accustomed to living in hot weather, Read more

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Posted in: Seasonal, Health Tips

  • Ryan B.

    Verified customer
    Quality 10
    Loyalty Yes
    Helpful expertise Yes

    I feel confident in their work.
    They are very professional. They are also friendly and have time to talk.

    Response to Diamond Certified Company Mark's Transmission Service

  • Tyler D.

    Verified customer
    Quality 10
    Loyalty Yes
    Helpful expertise Yes

    They delivered what was promised.
    They were on time.

    Response to Diamond Certified Company Black Diamond Paver Stones & Landscape, Inc.


Jeff Schroeder is general manager of American Kitchen and Bath, Inc., a Diamond Certified company since 2008. He can be reached at (408) 372-8959 or by email.


Jeff Schroeder: A Natural Transition

By James Florence, Diamond Certified Resource Reporter

SAN JOSE — By his account, Jeff Schroeder’s entry into the home remodeling field was a purely natural transition. “My father actually started his own remodeling company back in 1980, and as a kid, I would go to jobsites with him from time to time,” he remembers. “During my senior year of high school, I started working for him on a more regular basis, which was when I really got hooked. As soon as I graduated, I started full-time in the industry and I’ve been at it ever since.”

Today, as general manager of American Kitchen and Bath, Read more

Expert tip
Waterproofing Your Home
SAN JOSE — An essential aspect of home maintenance (both inside and out) is protecting against moisture intrusion. One of the most effective measures in this regard is the application of sealant materials such as caulking. However, when performing this… Read more

Karen Skinner is senior project design specialist at Viking Pavers, a Diamond Certified company. She can be reached at 408-601-7992 or by email.


Karen Skinner: A Reinvented Career

By James Florence, Diamond Certified Resource Reporter

RICHMOND — After her longstanding career came to a sudden end, Karen Skinner took the opportunity to reinvent her professional livelihood. “I had been in the telecommunications industry for more than 30 years when I was unexpectedly laid off,” she recounts. “At that point, I took some time to decide what I would do next. I was pretty burned out on the telecom field and felt ready to reinvent myself and take on a new challenge.”

Not long after, Karen got wind of a sales position opening at a local paver company and decided to give it a shot. Read more

Expert tip
Tip for Paver Pool Decks
RICHMOND — Polymeric joint sand is used to fill the joints between individual stones in paver installations. It contains a latent plastic element that, when exposed to water, becomes activated and gives the sand an adhesive quality that locks the… Read more

Jay Furlong is CEO of Stanford Painting, Inc., a Diamond Certified company. He can be reached at (408) 622-0538 or by email.


Jay Furlong: A Fresh Coat

By James Florence, Diamond Certified Resource Reporter

MOUNTAIN VIEW — After finishing college, Jay Furlong could have pursued a career in his field of study, but instead he decided to start fresh in the painting trade. “I have a degree in mechanical engineering and product design,” he explains. “During the summers in college, I did handyman work with a friend, including some painting. After graduation, a lot of my colleagues got design jobs, but I didn’t like the idea of sitting at a cubicle or even working for a boss—I liked the freedom of doing my own thing. I looked at my options and decided to get into painting. Read more

Expert tip
House Painting: Upfront Cost vs. Long-Term Value
MOUNTAIN VIEW — When choosing a contractor to paint your house, it’s important to weigh upfront cost against long-term value. As you look at different bids, you’ll likely see a wide range of cost estimates and naturally be attracted to… Read more

Zaz Khan is owner of Fast Banners and Signs, a Diamond Certified company. He can be reached at (510) 256-3782 or by email.


Zaz Khan: Printing Success

By James Florence, Diamond Certified Resource Reporter

UNION CITY — After coming to the United States from the Fiji Islands in 2000, Zaz Khan worked in a number of industries before finding his true calling as a professional printer. “When you come to a new country, you basically have to start from scratch, so I took any work I could get,” he recounts. “At one point, I was working four different jobs just so I could feed my family. I did janitorial, catering and even became a professional butcher. Eventually, I got an opportunity to work with a friend who owned a print shop in Berkeley. I soon grew to enjoy the printing business, Read more

Expert tip
Making the Most of an Exterior Sign
UNION CITY — If you’re having a company print a sign to post on your personal or commercial property, it’s a good idea to invest in quality. While an inexpensive banner can work well for temporary signage, permanent signs (for… Read more

Mike Ross is president of Ross Roofing & Construction, Inc., a Diamond Certified company. He can be reached at (831) 708-8969 or by email.


Mike Ross: Roofing Legacy

By James Florence, Diamond Certified Resource Reporter

MARINA — As third-generation owner of his family’s business, Mike Ross has been involved in the roofing trade for as long as he can remember. “My grandfather started Ross Roofing & Construction in 1950, and my dad picked it up from him and ran it for 45 years,” he recounts. “Not surprisingly, I’ve been involved for most of my life. At age 10, I was put to work sweeping the yard and sorting nails, screws, and insulation. I continued to work for the business during the summers through high school and college. After getting my degree in construction management at BYU, Read more

Expert tip
Safety Tip for DIY Roof Inspection
MARINA — As a preventative measure, regular roof inspections are vitally important, as they provide an opportunity to catch problems like leaks and dry rot before they compromise the roof’s integrity. The frequency of inspections should depend on the roof’s… Read more

Ilan Sigura is a lifetime veteran of the construction industry and CEO of Sigura Construction, Inc. a Diamond Certified company since 2007. He can be reached at (408) 372-8945 or by email.


Ilan Sigura: An Integral Career

By James Florence, Diamond Certified Resource Reporter

SANTA CLARA — By the time he reached early adulthood, Ilan Sigura had already established deep roots in the construction industry. Even when he tried his hand at a new profession, it wasn’t long before he returned to the field that had become an integral part of his identity. “My father was a contractor, and he began teaching me the trade when I was just a boy,” he explains. “Later, as a college student, I decided to study computer science. After I graduated, I spent a couple of months engineering software for a tech company, but I didn’t like it at all. Read more

Expert tip
Crucial Aspects of Green Building
SANTA CLARA – When it comes to designing and executing a remodeling project, one of the most important considerations is energy conservation. Building codes require a certain level of energy efficiency, but there are many opportunities to go above and… Read more

Graham Jones is owner of The Genteel Plumbers, a Diamond Certified company. He can be reached at (650) 525-4193 or by email.


Graham Jones: A Unexpected Direction

By James Florence, Diamond Certified Resource Reporter

SAN FRANCISCO — Graham Jones never planned on becoming a plumber, but when his original professional pathway diverged, that’s the direction it took him in. “I was actually going to automotive school, with plans to become a mechanic,” he recounts. “However, at a certain point I realized it wasn’t the right career for me, mostly because I didn’t want to be stuck in the same place every day. I expressed this to my brother, who’d recently switched from working as a chef to becoming a plumber. He recommended I look into plumbing, so I did. I ended up doing an apprenticeship with a company in San Rafael, Read more

Expert tip
An Easy Way to Maintain Your Sink Drains
SAN FRANCISCO — To prevent clogged sink drains, it’s a good idea to routinely clean out your drain pipes. Rather than using a store-bought drain cleaner like Drano®, try a simpler method: dish soap. It’s no wonder that dish soap… Read more

Dr. William Hummer is owner of William R. Hummer, DDS, a Diamond Certified practice since 2002. He can be reached at (510) 351-5711 or by email.


Dr. William Hummer: An Early Calling

By James Florence, Diamond Certified Resource Reporter

SAN LEANDRO — Many people find their professional callings in adulthood, but Dr. William Hummer knew much earlier what he wanted to do with his life. “I was 13 years old when I decided I wanted to be a dentist,” he affirms. “Around that time, a lot of my peers were talking about what they wanted to do when they grew up. I had just gotten braces, so I naturally thought of my orthodontist. He had his own business, made his own schedule and earned a nice income; plus, he got to work with his hands and take care of people for a living. Read more

Expert tip
Heeding the Warning Signs of Oral Cancer
SAN LEANDRO — Treating cancer is one of the great challenges of modern health care, and dentistry is no exception. According to the Oral Cancer Foundation, nearly 50,000 people in the United States are diagnosed with oral cancer each year,… Read more

Brandon Stieg is president of Pacific Circle, Inc., a Diamond Certified company since 2007. He can be reached at (415) 785-8044 or by email.


Brandon Stieg: Finding a Balance

By James Florence, Diamond Certified Resource Reporter

LAGUNITAS — As a young man, Brandon Stieg had a talent for architecture, but he preferred being outside to sitting at a drafting desk. Eventually, he was able to find a balance between the two. “I’ve always been artistic, but I was also good at math, so when I got to college, it made sense to major in architecture,” he recounts. “However, soon after starting an architectural apprenticeship, I realized I didn’t want to be an architect. The idea of being at a desk for eight hours a day just didn’t appeal to me—I wanted to be working outside. Read more

Expert tip
Metal Enhancements for Wood Decks and Fences
LAGUNITAS — Natural wood is a popular material for building exterior structures like decks and fences. However, due to wood’s sensitivity to the elements, these types of structures are often prone to functionality and maintenance issues. A good way to… Read more

Jay Kats is owner of Revolt Electric, a Diamond Certified company. He can be reached at (408) 412-9754 or by email.


Jay Kats: All Revved Up

By James Florence, Diamond Certified Resource Reporter

SUNNYVALE — For Jay Kats, a love of cars ultimately led to a career as an electrician. “I’ve been working on cars since before I was old enough to drive,” he affirms. “In the course of learning mechanical work, I also learned how to work with the electrical aspects of automotive. However, when it came time to get a job, I didn’t want to be a mechanic, mainly because I didn’t like being stuck in one place, even if it was a garage. Since I was well-versed in automotive electrical, I decided I would learn to do electrical work on a wider scale and become a professional electrician.”

Today, Read more

Expert tip
How to Identify Unsafe Circuit Breakers
SUNNYVALE — Like most inconspicuous household components, residential electrical panels are often overlooked, which is why many Bay Area homes still have their original circuit breakers. The problem is that some old circuit breakers pose significant safety hazards. Two examples… Read more

Cori Chipman is chief operations officer of No More Dirt, Inc., a Diamond Certified company. She can be reached at (415) 484-5907 or by email.


Cori Chipman: A Dynamic Career

By James Florence, Diamond Certified Resource Reporter

SAN FRANCISCO — Cori Chipman never planned on getting a job in the janitorial industry, but after nearly a decade, she’s glad she did. “I doubt that I would have applied at a janitorial company if it weren’t for the 2008 recession,” she explains. “I was working in the hospitality industry in Hawaii and the recession hit us particularly hard. I ended up moving back to San Francisco, where I immediately began looking for work. One of the companies I applied at was No More Dirt. I had no idea what working for a janitorial company would be like, Read more

Expert tip
Strategy for Maintaining a Breakroom Refrigerator
SAN FRANCISCO — A janitorial hot spot in most offices and workplaces is the breakroom refrigerator. When this gets neglected (which is commonly the case), it can result in foul odors, mold growth and other unpleasant developments. One day, it’s… Read more

Dr. Lei Luo is president of Lei Luo, D.D.S. Family & Implant Dentistry, a Diamond Certified practice. He can be reached at (650) 525-4186 or by email.


Dr. Lei Luo: Dental Migration

By James Florence, Diamond Certified Resource Reporter

SAN BRUNO — When Dr. Lei Luo came to the United States to learn about new techniques in dentistry, he hadn’t planned on becoming a permanent resident, but that’s exactly what happened. “I began my dentistry career in China in the early 1980s,” he recounts. “I originally got into dentistry on the advice of my father, who was a doctor. He thought it would be a good profession for me to pursue, especially since dentists were in high demand. In 1996, after practicing for more than a decade, I wanted to increase my skills and knowledge, so I came to the U.S. Read more

Expert tip
Dental Implant Advantages
SAN BRUNO — When it comes to replacing missing teeth, the most popular method in use today is dental implants. Essentially, a dental implant is an artificial tooth fastened onto a metal post that’s surgically implanted into the patient’s jawbone.… Read more