- Top-Rated Companies
- The Certification
- Consumer Resources
- Expert Advice
- About Us
- Site Map
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 Napa, Solano, Sonoma and Marin Counties
Serving the Bay Area
Serving all of Marin and Sonoma counties including Mill Valley, San Rafael, Novato, San Anselmo, Santa Rosa, Rohnert Park, Sebastopol and Windsor.
Serving all of San Mateo and Santa Cruz counties including Redwood City, S San Francisco, Daly City, Watsonville, Scotts Valley and Capitola.
Serving Santa Clara, San Mateo and Santa Cruz Counties
Serving all of Alameda and Contra Costa counties including Berkeley, Fremont, Hayward, Oakland, Walnut Creek, Richmond, Danville, Concord and Antioch.