Shed permit rules in Clark County, WA — also referred to as storage shed, backyard shed, or accessory building regulations — set size limits, setbacks, and when a building permit is required.
Detached garden sheds, gazebos, and play houses may sit in side or rear setbacks in single-family zones. In residential (R1) zones, detached accessory buildings on lots 20,000 sq ft or smaller cannot exceed 18 feet in height; larger lots allow up to 35 feet. Sheds over 200 sq ft generally
CCC 40.260.010 regulates detached accessory buildings including sheds, garages, greenhouses, and guesthouses. In the R1-5, R1-6, R1-7.5, R1-10 and R1-20 districts, garden sheds, gazebos and play houses may be permitted in side or rear setbacks subject to CCC 40.200.070(A)(4). Height is capped at 18 feet on lots of 20,000 sq ft or less and 35 feet on larger lots. Clark County's building program requires a permit for garden sheds larger than 200 sq ft; any size shed in a mobile home park or multi-family zone requires a permit. Cities within the county set their own thresholds.
Erecting an oversized or improperly sited shed, or one over 200 sq ft without a permit, can trigger correction notices, permit-after-the-fact fees, and Title 32 civil enforcement.
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