Bellevue, WA Building Setbacks & Zoning: Setback Rules (2026)

Bellevue setback standards are set by Land Use Code LUC 20.20.010 and vary by zoning district. In the most common single-family zones (R-1, R-1.8, R-2.5, R-3.5, R-4, R-5, R-7.5), principal structures typically must be at least 20 feet from the front property line, 5 feet from each side lot line, and 15 to 20 feet from the rear line. Corner lots have two effective front yards. Accessory structures under 200 square feet may be placed as close as 5 feet from side and rear lines. Higher-density zones (R-10, R-15, R-20, R-30) use different standards that step back based on building height to protect neighbors from shadow and privacy impacts. Downtown and mixed-use zones follow separate design districts. Eaves, chimneys, bay windows, and other architectural projections may extend up to 18 inches into required setbacks. Lots adjacent to critical areas (wetlands, streams, steep slopes) face larger effective setbacks based on LUC 20.25H buffer widths. Variances to setbacks require a LUC 20.30F process and evidence of hardship unique to the lot, not a self-imposed condition. Always check zoning on bellevuewa.gov mapping before designing additions.