Petaluma, CA Building Setbacks & Zoning: Setback Rules (2026)

6 of the Petaluma Implementing Zoning Ordinance, the development standards table for the Natural and Rural Zones, sets the primary structure setback for the RR (Rural Residential) zone at 40 feet on the front, street-side and rear, and 20 feet on each interior side yard. The R1 (Residential 1) zone carries smaller minimums: 30 feet front, street-side and rear, and 15 feet on each interior side. The table's own note directs that 'Minimum setbacks required. See Chapter 12 for modifications, reductions, and encroachments. See Chapter 7 for any setback requirements applicable to a specific land use,' meaning Chapter 12 (Development Standards Modifications) can adjust these numbers for a particular project and Chapter 7's use-specific standards, such as those for accessory dwelling units or home occupations, can override the general figures for that use.

The RR zone additionally requires a 150-foot minimum lot width for interior lots and 165 feet for corner lots, with a two-acre minimum lot area, reflecting its rural-transition purpose along the city's western urban growth boundary; R1 requires a 100-foot interior lot width, 110-foot corner lot width and 20,000-square-foot minimum lot area. Garage-front setbacks match the general front setback in both zones, 40 feet in RR and 30 feet in R1. 6, a property owner should confirm the parcel's actual zone designation with the Planning Division before applying any of these numbers to a specific lot.