diamond certified company certificate

Companies must pass rigorous rating standards to earn Diamond Certified. Photo: American Ratings Corporation ©2018

Welcome Aboard!

We’re pleased to announce the following companies have recently been awarded Diamond Certified. This means they’ve passed our rigorous 12-step ratings process and scored Highest in Quality and Helpful Expertise™.


CDH Construction

(707) 207-6954


Services Performed: Home Repairs and Remodeling; Trim Work; Cabinet, Door, Window and Baseboard Detailing

Areas Served: Sonoma, Napa and Marin Counties


Oilstop Drive Thru Oil Change

1004 Lakeville Street, Petaluma: (707) 207-6498

601 East Washington Street, Petaluma: (707) 232-4366

6111 Redwood Drive, Rohnert Park: (707) 240-5244

5070 Redwood Drive, Rohnert Park: (707) 243-8438

2190 Cleveland Avenue, Santa Rosa: (707) 247-5070

1375 Santa Rosa Avenue, Santa Rosa: (707) 247-5619


Services Performed: Oil Changes, Air Filter Changes, Windshield Wiper Blade Replacement, Cooling System Fluid Replacement

Areas Served: Northern, Central and Southern California; Oregon; New Mexico; and Arizona


Customer Feedback

When consumers choose Diamond Certified companies, they see a difference in the level of quality and customer service they receive. We’ve been getting feedback from a number of Bay Area consumers who’ve experienced this difference.

Customers are impressed by the professionalism of Advanced Cleaning Systems Inc. Photo: Advanced Cleaning Systems Inc. ©2018

E.J. from San Francisco is a repeat customer of Advanced Cleaning Systems Inc., a Diamond Certified carpet cleaning company. E.J. writes that owner Jeff Yamaoka and his staff “did a wonderful job cleaning my in-laws’ carpet and rental unit. Jeff also cleaned the carpets at our house a couple of years ago, and he did a great job back then, too. Jeff and his staff are very professional and they do really good work.”

We also got a short message from Jacqueline B., who says she would recommend California Fencing to anyone.

We’d love to hear if a Diamond Certified company went above and beyond to serve you. You can reach us at [email protected] or (415) 884-2700.

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