Overview
Preemption classification
Tier C — Dual preemption
Pro-housing: HB 1110 (middle housing), HB 1337 (ADUs — 2 per lot, no opt-out), HB 1491 (TOD near transit), 2025 parking reform. Restricts locals: rent control preemption, bans mandatory inclusionary zoning.
Governance
Statewide
Building and zoning code adoption is mandated at the state level.
Adopted building codes
Statewide; update sched May 2026
City-level IBC adoptions (5)
| City | IBC | Amendment notes |
|---|---|---|
| Bellevue | 2021 | |
| Kent | 2021 | |
| Marysville | 2021 | |
| Seattle | 2021 | |
| Tacoma | 2021 |
View building-code adoption for Washington →
5 of 5 codes adopted (IBC, IRC, IECC, IFC, NEC)
Profiled counties
Cities
Showing 9 of 9
| City | Population | Code | Status | Issues |
|---|---|---|---|---|
| Bellevue | — | Bellevue Land Use Code (LUC) Title 20 — Land Use Development (Bellevue City Code Title 20) · 29 districts | V2 ✓ | freshness:volatileplatform-gating:cloudflare-municipal-codesdistrict-renaming-in-flight:R-x-codes-being-renamed-to-LL/SR/LDR/MDR-per-Ord-6851 |
| Bellingham | — | Bellingham Municipal Code (BMC) Title 20 — Land Use Development · 8 districts | V2 ✓ | freshness:volatileplatform-gating:cloudflare-municipal-codes |
| Kent | — | Kent City Code (KCC) Title 15 — Zoning · 20 districts | V2 ✓ | freshness:volatilepost-recode-district-rename-2025 |
| Marysville | — | — | V2 ✓ | freshness:volatiledata:gaps-present |
| Seattle | — | Seattle Municipal Code (SMC) Title 23 — Land Use Code · 15 districts | V2 ✓ | freshness:volatiledata:gaps-present |
| Spokane | — | Spokane Municipal Code (SMC) Title 17C — Land Use Standards (Unified Development Code) · 21 districts | V2 ✓ | freshness:volatileboh-implementation-in-flight:legacy-RSF/RTF-replaced-by-R1/R2/RMF/RHD-per-ORD-C36459 |
| Tacoma | — | Tacoma Municipal Code (TMC) Title 13 — Land Use Regulatory Code · 27 districts | V2 ✓ | freshness:volatilepost-recode-home-in-tacoma-rolloutecode360-cloudflare-gated-primary |
| Vancouver | — | Vancouver Municipal Code (VMC) Title 20 — Land Use and Development · 17 districts | V2 ✓ | freshness:volatile |
| Walla Walla | — | City of Walla Walla Municipal Code, Title 20 — Land Use · 3 districts | V2 ✓ | data:gaps-present |
Research status
Data quality
100%completeness9 confirmed