Santa Clara County, CA Building Setbacks & Zoning: Setback Rules (2026)

Setbacks vary by zoning district in the unincorporated county; there is no single countywide number. Under the urban residential base district standards in Zoning Ordinance Table 2.30-3, the R1 district requires a 25-foot front yard, 5-foot side yards, a 10-foot exterior side yard on corner lots, and a 25-foot rear yard; other urban districts (R1E, RHS, R1S, R2, R3) carry their own figures in the same table. Rural base districts under Table 2.20-3 generally require 30-foot front, side, and rear setbacks. Where a lot-size and setbacks combining district applies, Table 3.10-1 supersedes the base setbacks; for example a '-6' (6,000 sq ft) district uses a 25-foot front, 6-foot side, and 25-foot rear, while larger rural combining districts use 30 feet on all sides. Slope-density combining districts require 30 feet from all property lines or rights-of-way. Setbacks are measured from the rough exterior structural wall (excluding trim, siding, and stucco) to the nearest lot line, and from the edge of any abutting right-of-way or established future-width line. Section 4.20.110 provides important exceptions: architectural features such as eaves, chimneys, and bay windows may project up to 30 inches into a setback, decks and porches have defined encroachment allowances, and substandard or narrow lots may qualify for reduced side and rear yards. Because the controlling number depends on your district and overlays, confirm setbacks with County Planning before building.