The Certification Process






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    Local companies rated
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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

Ralph Foglein Owner
European Auto Works

Jim Baylor Consumer
Bay Area

Mark Corrallo President
All Seasons Construction

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...

Tip Sheet: Four Preventative Measures for a Tenancy

Posted on August 03, 2017 by James Florence

While part of preparing a rental property for market is getting the physical space move-in ready, the other part is addressing non-physical details such as tenant screening. Due to the potential consequences of oversights or poor decisions in this area, it’s important to take a meticulous, preventative approach. To learn a few critical steps, read the following tip sheet by Diamond Certified Expert Contributor Sam LaPlaca of CM Property Management Inc.:

1. Verify income. Accepting a tenant who can’t afford the rent is a mistake that can cost you a lot of time, money and frustration. That’s why, in addition to asking for pay stubs and bank statements, Read more

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Posted in: Consumers
Tags: ,

Is there a “Right Way” to Give Feedback?

Posted on July 27, 2017 by Joy Lanzaro

Delivering feedback isn’t always easy. Before deciding to speak up, you may wrestle with competing goals of personal and social responsibility versus a desire to avoid conflict. At some point, every service provider has needed constructive feedback to better serve their customers. In speaking to thousands of consumers over the years, I’ve found that some people prefer to silently move on and not use that company’s services again. In those cases, everyone loses. Armed with the following tips, you may feel empowered to turn an unsatisfactory situation around and experience increased goodwill and satisfaction. Read more

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Posted in: Consumers, Customer Service

5 Ways to Lower Your Cooling Costs

Posted on July 20, 2017 by James Florence

A central air conditioner can be priceless on a hot summer day, but the cost of running it certainly isn’t. While having a well-maintained, energy-efficient system will help keep your cooling bills in check, another smart step is finding ways to keep your home naturally cooler, which reduces the need to run your system in the first place. Here are five measures to consider:

1. Install a whole house fan. On summer mornings and evenings, it’s not unusual for the temperature outside the home to be cooler than on the inside. In this instance, running the air conditioner can feel like a waste of energy. If only there was a way to get that cool outdoor air into the home… Read more

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Posted in: Home Tips, Home Improvement
Tags: , , , , ,

  • O.C.

    Verified customer
    Quality 10
    Loyalty Yes
    Helpful expertise Yes

    That you're in good hands
    I guess that the work is, you know, flawless. In other words, the client and the owner had no objections to their craftsmanship, and that's very important, because all eyes are different. The client was very satisfied. They're not the cheapest, but you get quality results.

    Response to Diamond Certified Company RFJ Meiswinkel Company

  • Jose M.

    Verified customer
    Quality 10
    Loyalty Yes
    Helpful expertise Yes

    We've been using Doctor Aller for years. Both my wife and I saw him before we started a family and now all of our children see him. We are keeping it in the family. He is a pioneer in eye correction.
    He's very personable and very knowledgeable and a pioneer in eye services. It's always been a great experience. Everything is nice from the exam rooms to the showroom.

    Response to Diamond Certified Company Dr. Thomas A. Aller Optometrist, Inc.


John Gorman is a 30-year veteran of the window industry and owner of Save Energy Company, a Diamond Certified Company since 2002. He can be reached at (707) 702-1918 or at [email protected]


John Gorman: One Man’s Journey

By MATTHEW SOLIS, Senior Editor Diamond Certified Resource

John Gorman has been enjoying a successful career in the window and door industry for the past 30 years, but the path he followed to get to his current destination wasn’t always clear. In fact, a career in windows wasn’t even on John’s radar until he received an intriguing proposition from a trusted relative. “I was living in New York studying literature and got a call from my older brother,” he remembers. “He was working for a window company in Northern California and wanted to start his own firm, and he asked if I would join him. I said, Read more

Expert tip
How to Choose the Right Window Frames
PETALUMA — In the past, homeowners who wanted to replace their windows were somewhat limited in their choices. Today, consumers can choose from a wide variety of window options and find a product that best fits their lifestyle,… Read more

Sheik Bacchus is owner of Bacchus British Services, a Diamond Certified company since 2009. He can be reached at (925) 385-8954 or by email.


Sheik Bacchus: British Fixation

By James Florence, Diamond Certified Resource Reporter

DUBLIN — Sheik Bacchus got an early start in automotive work thanks to the influence of his older brother, but it wasn’t until college that he caught the bug for British cars. “My dad died when I was pretty young, so my older brother became my mentor and taught me a lot of stuff,” he recounts. “I was about 14 when he got me into working on cars. I would help him with his brakes, oil changes and other maintenance, and that became very influential for me. Following high school, I went to college to get my formal automotive training, Read more

Expert tip
Coolant Leak Warning for Newer JLRs
If you own a Jaguar or Land Rover (JLR) from 2010 or later, you’ll want to know about a common issue to watch out for. In recent years, it has become increasingly apparent that the 5.0 motors found… Read more

Miguel Vega is owner of Magna Shutters, a Diamond Certified company. He can be reached at (408) 758-5660 or by email.


Miguel Vega: A Passion for Craftsmanship

By James Florence, Diamond Certified Resource Reporter

SANTA CLARA — After 30 years of creating custom window treatments, Miguel Vega still has a passion for the craftsmanship he was taught as a young man. “I attended a Mexican-Italian trade school where I learned about all sorts of trades, from plumbing and electrical to welding and carpentry,” he recounts. “It was quite an experience—six years of intensive training under Italian craftspeople with extremely high expectations. The field that intrigued me most was fine carpentry, especially designing and fabricating plantation shutters, which requires a lot of skill and precision.”

After graduating from trade school in 1991, Read more

Expert tip
Benefits of Plantation Shutters
SANTA CLARA — If you’re planning to replace the window treatments in your home, one option worth considering is plantation shutters. Plantation shutters provide many benefits, including: Durability Plantation shutters are designed to last more than 20 years, which is… Read more

Joe Moore is owner of Joe Moore Painting & Roofing, a Diamond Certified company since 2005. He can be reached at (707) 837-0620 or by email.


Joe Moore: Two Trades are Better Than One

By James Florence, Diamond Certified Resource Reporter

WINDSOR — By the time Joe Moore was ready to start his own business, he’d already amassed a wealth of professional experience in the painting and roofing trades. “I started painting when I was a kid and spent much of my youth working for my uncle, who was a well-known painter in San Francisco,” he says. “Later, I dated a girl whose father was a roofer and ended up working for his company for 15 years. When I reached my 20th year in roofing, I felt it was time to start my own business.” Rather than decide which of his two fields of expertise to focus on, Read more

Expert tip
Preventing Roof Leaks from Pipe Jacks
WINDSOR — Most roof leaks can be avoided with basic preventative maintenance. One example of this is with pipe jacks, which are metal flanges placed over the plumbing ventilation pipes that protrude from the roof. To seal against moisture intrusion,… Read more