FAQ

California building code FAQs

These are real questions people ask GoCodebook about California building codes, zoning, and ADUs — answered in plain English with citations you can check against the verbatim code text.

Zoning

• Can I convert a single-family home into a duplex or multiplex in California?
• What is the maximum building height in San Francisco's RH-3 zoning district?

ADU

• What is the minimum ADU size a California city must allow?

Building code

• What are the handrail graspability requirements in the California Building Code?
• What are the egress requirements for a duplex in California?
• How do I calculate average grade plane (CBC §202) on a sloped lot in San Francisco?
• What is the minimum garage size for a single-family home in San Francisco?
• What are the minimum egress window size requirements in California?
• What are the WUI (Wildland-Urban Interface) construction requirements in California?

Permits

• When is Section 311 neighborhood notification required in San Francisco?