San Mateo establishes minimum residential setbacks by zone district in Title 27, Chapter 27.22 and the building line/setback standards in Section 27.38.100. Single-family zones require front setbacks of 20-25 feet, side yards of 5-10 feet, and rear yards of 20 feet or 20% of lot depth.
Residential setback requirements in San Mateo are established in Title 27 of the municipal code. Chapter 27.22 defines yard requirements including front, side, and rear yards. Section 27.38.100 provides building line and setback standards. In R-1 single-family zones, the front yard setback is typically 20 feet. Interior side yards are generally 5 feet minimum. Rear yards must be at least 20 feet or 20% of the lot depth, whichever is less. Section 27.22.090 specifically addresses rear yard requirements including exceptions for cornices, eaves, bay windows, steps, and similar architectural features. The city also applies a daylight plane standard that limits building height based on distance from property lines. ADUs have specific setback exceptions under Chapter 27.19.
Construction encroaching into setbacks requires a variance or exception. Building without approval is a code violation subject to enforcement including potential removal. Variances require Planning Commission review.
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