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

040 sets both the baseline setbacks used across unincorporated Pierce County and the exceptions layered on top of them. 040-1 assigns each urban zone classification its own front, interior, and rear minimums: Suburban Residential (SR) requires 25 feet from an arterial front, 15 feet from a non-arterial front, 5 feet on the interior/side (with a footnote allowing 0 feet for attached structures), and 10 feet at the rear. Denser designations like Urban Corridor (UCOR), Towne Center (TCTR), and Neighborhood Corridor (NCOR) drop every setback to 0 feet, while rural classifications such as Rural Five (R5) require a 25-foot front, 10-foot interior, and 30-foot rear setback under the companion rural table.

040(A)(2) defines how those yards themselves are assigned: every lot must carry at least one front yard except pipestem lots, a rear yard is required except on corner, through, and pipestem lots, and every other yard is treated as an interior setback, with corner lots getting a reduction to 15 feet on the yard not used for vehicular access, provided it doesn't abut a state highway or arterial. 040(B)(4)(a) allows detached, single-story accessory structures, other than accessory dwelling units, to occupy up to 25 percent of the interior yard's total area while holding a minimum setback of just 3 feet, with the front and rear yard excluded from that interior-yard area calculation. 040-1, and it exists specifically for sheds, detached garages, and similar accessory buildings rather than the primary residence.