WA · 2023

HB 1337 ADU Reform

Requires cities and counties to allow two ADUs per lot with single-family homes, eliminates owner-occupancy requirements, and caps ADU impact fees at 50% of those for the principal unit. Local compliance was due June 30, 2025, with streamlined permitting starting July 1, 2025.

Guides for HB 1337 ADU Reform are on the way.