Yakima, WA Accessory Structures: Shed Rules (2026)

Yakima's accessory-structure framework sits in YMC Chapter 15.05 (Site Design and Improvement Standards), specifically Table 5-1 (setbacks by zone) and the related Table 5-2 (lot coverage and density). Detached residential accessory structures — sheds, detached garages, carports, gazebos, pool houses, workshops — generally follow these standards in SR, R-1, R-2, R-3, and HB residential zones: side yard setback 5 ft minimum, rear yard setback 5 ft minimum, no closer to the front property line than the principal building (or per Table 5-1 front yard standard), maximum height generally 15-20 ft (or up to the height of the principal dwelling, depending on zone), and maximum lot coverage per Table 5-2 (typically 50-60 percent total impervious in R-1, higher in R-2/R-3). Accessory structures may not exceed the height or building area of the principal residence and must remain subordinate. Manufactured/portable storage containers (PODS, shipping containers) used as a permanent residential storage solution are generally prohibited in residential zones under YMC 15.05; temporary placement during a move is typically allowed for short periods. The 2018 Washington State Building Code (RCW 19.27.031 — adopting the 2018 International Building Code and 2018 International Residential Code as amended by WAC 51-50 and WAC 51-51) is administered by the Yakima Code Administration Division. IRC R105.2 exempts one-story detached accessory structures used as tool sheds, storage sheds, playhouses, and similar uses up to 200 sq ft from a building permit — provided the structure has no plumbing, no electrical (no fixed wiring), and no mechanical (no HVAC) systems. Sheds over 200 sq ft, sheds taller than one story, or sheds with any utility connections require a Yakima building permit (typical fee $100-$300 + plan review). Permits cover wind and seismic anchorage to Yakima's basic wind speed (90-100 mph in the Yakima Valley per WAC 51-50) and Seismic Design Category D1. Foundation requirements vary: sheds under 200 sq ft on skids are typically allowed; sheds over 200 sq ft generally require frost-protected footings to 36 inches per IRC R403. Setbacks remain enforceable regardless of permit exemption — a permit-exempt 200 sq ft shed must still meet the 5 ft side/rear setbacks in YMC 15.05 Table 5-1.