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, with comprehensive amendments through June 24, 2024 (HB 1110 and HB 1337 implementation) · 17 districts | V1 Legacy | schema:v1-legacypriority:mediumdata:gaps-present |
| Bellingham | — | Bellingham Municipal Code (BMC) Chapter 20 — Land Use and Development Code · 13 districts | V1 Legacy | schema:v1-legacypriority:mediumdata:gaps-present |
| Kent | — | Kent Revised Code (KRC) Title 19 — Land Use and Development · 13 districts | V1 Legacy | schema:v1-legacypriority:mediumdata:gaps-present |
| 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 17 — Unified Development Code (UDC) · 13 districts | V1 Legacy | schema:v1-legacypriority:lowdata:gaps-present |
| Tacoma | — | Tacoma Municipal Code Title 13 · 18 districts | V1 Legacy | schema:v1-legacypriority:mediumdata:gaps-present |
| 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
44%completeness4 confirmed5 not found