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

Renton Municipal Code Title 4-2 establishes setback requirements by zoning district for all new buildings, additions, and most accessory structures. In the R-8 zone, which covers much of single-family Renton, the typical minimum setbacks are 15 feet from the front property line, 5 feet from interior side lines (sometimes reduced for attached garages), 20 feet from rear lines, and 15 feet along street-facing exterior side yards. Higher density zones such as R-10 and R-14 have tighter setbacks, while Resource Conservation and R-1 zones have significantly larger setbacks. Critical areas regulations in RMC 4-3-050 add buffers beyond base setbacks for streams, wetlands, steep slopes, and shorelines on Lake Washington, the Cedar River, and the Black River. Accessory dwelling units and accessory structures have separate setback schedules, typically 3 feet or 5 feet. Required setbacks are measured from the property line to the nearest point of the building, not from fences or eaves. Verify your specific zone and lot with CED at (425) 430-7294 before designing.