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You are the customer. If your goal is to choose a business that will deliver high customer satisfaction and quality, you'll feel confident in choosing a Diamond Certified company. Each has been rated Highest in Quality in the most accurate ratings process anywhere. And you're always backed by the Diamond Certified Performance Guarantee.
More than 200,000 customers of local companies have been interviewed in live telephone calls, and only companies that score Highest in Quality in customer satisfaction (a 90+ on a 100 scale) and pass all of the credential-based ratings earn Diamond Certified. By requiring such a high score to qualify, the Diamond Certified Program eliminates mediocre and poorly performing companies. Read detailed information about the ratings and certification process.
Serving the East Bay Area including Alameda, Oakland and Oakley
Serving all of Alameda and Contra Costa counties including Berkeley, Fremont, Hayward, Oakland, Walnut Creek, Richmond, Danville, Concord and Antioch.
Serving San Mateo County and San Francisco
Serving all of San Mateo and Santa Cruz counties including Redwood City, S San Francisco, Daly City, Watsonville, Scotts Valley and Capitola.
Serving Sonoma and Marin Counties including Santa Rosa, Windsor, Petaluma, Rohnert Park, Cotati, Sebastopol and Sonoma.
Serving Alameda, Contra Costa, San Mateo and Santa Clara Counties