Shed permit rules in Kennewick, WA β also referred to as storage shed, backyard shed, or accessory building regulations β set size limits, setbacks, and when a building permit is required.
Sheds in Kennewick are regulated through two layers: (1) Kennewick Municipal Code Title 18 (Zoning) setting accessory-structure dimensional standards by district β typically rear-yard location, district-specific setbacks, and a maximum height around 15 feet; and (2) the Washington State Building Code at WAC 51-51, adopting the 2021 International Residential Code, which under IRC R105.2 exempts one-story detached accessory structures of 200 square feet or less from building permit requirements but does not waive zoning compliance. A zoning permit from the Kennewick Planning Division is generally still required even when a building permit is not.
Washington does not preempt local accessory-structure regulation. KMC Title 18 sets accessory-use standards by zoning district. Typical Kennewick residential standards require sheds in the rear yard behind the front building line of the principal dwelling, with side and rear setbacks commonly in the 3- to 5-foot range for accessory structures (district-specific in KMC Chapter 18.12 and the table of district standards), a maximum height for accessory structures (commonly around 15 feet), and aggregate accessory-structure lot coverage caps. Front and street-side setbacks match the principal-building setback for the district. The Washington State Building Code Council adoption of IRC R105.2 at WAC 51-51 typically exempts one-story detached accessory structures of 200 square feet or less from a building permit, provided the structure is not used for habitation, has no electrical or plumbing connections requiring separate permits, and does not exceed a single story. The exemption is from the building permit only β zoning compliance under KMC Title 18 is still required, and Kennewick Planning issues a zoning clearance or accessory-structure permit confirming setbacks and lot coverage. Sheds over 200 square feet require a building permit with structural review under IRC Chapter 8 and the Washington amendments. Climate-Zone 5B (eastern Washington) design loads apply: ground snow load commonly 15 to 25 psf depending on elevation, basic wind speed approximately 100 mph (ASCE 7), and seismic Design Category D1 in the Mid-Columbia.
Installing a shed without a required zoning clearance violates KMC Title 18, enforced under KMC Chapter 1.04 (Code Enforcement) through notices of violation, civil penalties, and abatement orders. Unpermitted sheds in setbacks or exceeding lot coverage may be ordered relocated or removed. Sheds over 200 square feet built without a building permit additionally violate the Washington State Building Code under RCW 19.27 and the Kennewick adoption of the IRC, triggering stop-work orders from the Building Division and after-the-fact permit fees commonly at double the standard rate.
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