diamond certified company certificate

Companies must pass rigorous ratings standards before they earn Diamond Certified. Photo: American Ratings Corporation ©2018

Welcome Aboard!

We are delighted to introduce the newest companies to join the Diamond Certified Resource. By earning Diamond Certified, these companies have consistently demonstrated excellence. Only the best in the Bay Area can pass our rigorous 12-step ratings process and score Highest in Quality and Helpful Expertise™.


Absolute Plumbing and Drain

(925) 267-8561


Services Performed: Sewer, Water, and Gas Line Installation and Repair; Plumbing Installation and Repair; Conventional and Tankless Water Heater Installation and Repair; Drain Cleaning; Seismic Earthquake Valves; Plumbing Circulation Pumps

Areas Served: Contra Costa County, Solano County and Parts of Alameda County


The Genteel Plumbers

(650) 525-4193


Services Performed: Plumbing Installation and Repair, Sewer Camera Inspection, Water Heater Installation and Repair, Emergency Service

Areas Served: San Francisco, San Mateo and Santa Clara Counties


Ambrose Solar

(707) 219-8273


Services Performed: Solar System Design and Installation; Local Building, Electrical and Zoning Permits; HOA Review and Approval; Utility Interconnection; State and Local Rebate Applications

Areas Served: Solano, Napa, Yolo and Contra Costa Counties


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