A certified kitchen is defined as a fully equipped prep kitchen that has been certified by the county health department where it is located.  The type of facility can vary but the most common are shared kitchen spaces, restaurants, and food incubators.  Below are a few lists of Bay Area commercial kitchens:

• Bay Area Commercial Kitchens (source: Alameda County Health Department)
• IKitchens (areas providing space: San Jose, Palo Alto)

This list does not reflect the only certified kitchens in the San Francisco Bay Area.  Many times, local churches, Lions Clubs, and restaurants are willing to rent out their kitchens while they are not being used.  You can use local county, city, and health department websites to help you locate certified commissary kitchens in your area