Shed permit rules in Federal Way, WA — also referred to as storage shed, backyard shed, or accessory building regulations — set size limits, setbacks, and when a building permit is required.
Federal Way exempts one-story sheds up to 200 sq ft from building permits under FWRC 13.15 and WAC 51-16-080. Larger sheds, electrical/plumbing work, or critical-area locations need permits. Zoning setbacks always apply.
Under FWRC Chapter 13.15 adopting the Washington State Building Code and IBC/IRC amendments, one-story detached accessory structures used as tool sheds, storage sheds, playhouses, and similar uses are exempt from building permit requirements if the floor area does not exceed 200 square feet. This mirrors WAC 51-16-080 and the International Residential Code Section R105.2. Even exempt sheds must comply with FWRC Title 19 zoning setbacks (typically 5 feet from side and rear property lines in single-family RS zones, with varying front-yard setbacks), height limits, and lot-coverage limits. Sheds over 200 sq ft, any shed with electrical wiring or plumbing, any shed in a critical area (wetland, stream, steep slope buffer), and any shed on a parcel with a substantial development permit require permits. Sheds cannot be used as ADUs or habitable space without full ADU permitting. The Federal Way Permit Center at (253) 835-2607 answers shed-specific questions. Many HOAs have additional aesthetic/placement rules.
Shed built without required permit: stop-work order, civil infraction under FWRC 1.15, retroactive permit fees (typically 2x normal) or required removal. Setback violations may also trigger enforcement.
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