This bill amends existing regulations for buildings used for residential purposes in Washington State, specifically targeting code cities and municipalities. It mandates that these cities adopt or amend their development regulations to comply with new requirements by June 30, 2026. The bill prohibits cities from imposing certain restrictions on housing unit density, parking requirements, and permitting processes for existing buildings designated for residential use. Notably, it allows for the addition of housing units at a density of up to 50% more than what is currently permitted, provided that health and safety standards are met. Additionally, it specifies that unchanged portions of existing buildings do not need to meet current energy codes solely due to the addition of new units, with certain exceptions outlined.

Key insertions in the bill include the requirement for cities to incorporate regulations for buildings in commercial, mixed-use, or residential zones, and the clarification that permitting requirements cannot exceed those generally applicable to all residential development. The bill also introduces specific conditions under which energy code compliance is not required for existing buildings, such as size limitations on new units and documentation of energy use intensity. Overall, the legislation aims to facilitate the addition of housing units in existing buildings while maintaining necessary health and safety standards.

Statutes affected:
Original Bill: 35A.21.440, 35.21.990