Diamond Certified Expands From the San Francisco Bay Area to Denver, Arapahoe, Boulder and Jefferson Counties

Colorado homeowners gain a new resource for finding roofing contractors that have been independently rated Highest in Quality and Helpful Expertise®.

PETALUMA, Calif., Sept. 17, 2026 /PRNewswire/ -- American Ratings Corporation, the creator of Diamond Certified Resource, the source for consumers who love quality local companies, is bringing its researched-based rating system from the San Francisco Bay Area to quality-seeking homeowners in Denver, Arapahoe, Boulder and Jefferson Counties in Colorado. The expansion will begin with roofing contractors that pass Diamond Certified's 12-step rating process and score "Highest in Quality and Helpful Expertise."

Colorado roofing companies can apply for Diamond Certified until September 23. A limited number of Founder positions are available in each county on a first-applied basis, giving qualifying companies the opportunity to establish an early presence in the new market. Founders get five years of free top placement, a rate lock and a money-back guarantee.

"We're excited to focus on roofing contractors with this Colorado expansion because it's a region where homeowners have to deal with a lot of hail and storm damage," says CEO Greg Louie. "We look forward to connecting the residents of Denver, Arapahoe, Boulder, and Jefferson Counties with roofers that have a proven track record of high-quality work and customer satisfaction."

"This is a great opportunity for Colorado roofers that believe in competing on quality rather than price alone," adds Director of Ratings David Pak. "If they're able to earn Diamond Certified, they'll get found more often in AI and Google Search, win more local competitor matchups, and make more sales with pricing power."

For the past 25 years, Diamond Certified Resource has been connecting local consumers with top rated companies in a wide range of service industries, from auto repair and dentistry to roofing and construction. Unlike open-access review websites where anyone can leave a review, Diamond Certified surveys a large, random sample of each company's real customers, which ensures the survey responses (reviews) are accurate, reliable and truly representative of each company's performance. Survey questions ask about the quality that each customer experienced, whether they received Helpful Expertise and whether they would use the company again.

Diamond Certified companies must also pass credential-based checks (business license, insurance, etc.) and be evaluated for customer-friendly business practices, their ability to perform to contract, and their commitment to standing behind their work. These additional requirements make the certification process much more comprehensive than typical review platforms.

These companies have recently earned Diamond Certified 
Agama Painting
Alcon Concrete
Better Electric
Brownstein Construction Inc.
Chase Electric
EBA Roofing Inc.
Keith Roofing Company
Mr. Rooter Plumbing of Sonoma County
Valiant Garage Door

It's easy to find top rated companies in the San Francisco Bay Area and Other Areas on Diamond Certified Resource.
Alameda County
Contra Costa County
El Dorado County
Fresno County
Los Angeles County
Marin County
Milwaukee County
Monterey County
Napa County
Orange County
Placer County
Sacramento County
San Benito County
San Francisco
San Joaquin County
San Mateo County
Santa Clara County
Santa Cruz County
Solano County
Sonoma County
Yolo County
Yuba County

About American Ratings Corporation
American Ratings Corporation (ARC), the creator of Diamond Certified Resource, the source for consumers who love quality local companies, rates local companies by surveying only their verified real customers to produce the country's most accurate ratings of local companies. It also creates deeply researched company reports and consumer guides that give consumers the best companies plus the best advice for choosing a local Auto, Home, Health or Personal service type of company.

Only companies rated Highest in Quality and Helpful Expertise^® earn Diamond Certified and are backed by their Performance Guarantee. All their deeply researched reports and guides are available for free at diamondcertified.org. They also produce an annual, full-color, printed Diamond Certified Directory with 840,000 copies published in 9 geographic zones in the Greater San Francisco Bay Area. Each April, these are mailed for free to their 182,000 Diamond Certified Preferred Members and selected homeowners and companies.

SOURCE American Ratings Corporation