The latest recipients include American Custom Contractors, First Tier Exterior, Hexagon Construction, Irbis HVAC Inc., and Masterpiece Remodeling Inc. These businesses underwent a 12-step evaluation conducted by the American Ratings Corporation, which requires companies to maintain high satisfaction levels and participate in mediation protocols to ensure ongoing performance standards.
Five Firms Earn Diamond Certified Rating for Quality and Expertise
Five local service providers have secured the Diamond Certified award for June 2026, a designation reserved for companies that score 90 or higher on a 100-point scale for quality and helpful expertise following a rigorous vetting process involving verified customer surveys and license verification.
Greg Louie, founder and CEO of American Ratings Corporation, noted that the certification remains a significant benchmark because most applicants fail to meet the stringent criteria. The evaluation process relies on random sampling of actual customers, ensuring that ratings reflect genuine experiences rather than skewed data. Each firm is now backed by the Diamond Certified Performance Guarantee, providing consumers with a layer of assurance when selecting contractors for home improvement, exterior renovations, or specialized mechanical services across the Bay Area and beyond.
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