The bill modifies existing regulations for buildings used for residential purposes in Washington State, specifically targeting code cities and their development regulations. It mandates that these cities adopt or amend their zoning regulations to incorporate new requirements for buildings in commercial, mixed-use, or residential zones by June 30, 2026. Key provisions include prohibiting restrictions on housing unit density that would limit the addition of units within existing building envelopes, eliminating parking requirements for new dwelling units, and easing permitting requirements for residential use of existing buildings. Additionally, the bill specifies that unchanged portions of existing buildings used for residential purposes are not required to meet current energy codes solely due to the addition of new units, with certain exceptions outlined.

The bill also clarifies that cities cannot impose design standards or architectural requirements beyond those generally applicable to residential development, nor can they deny building permits based on nonconformity unless it significantly detracts from the surrounding area. Furthermore, it allows for the addition of housing units in specific parts of buildings, with exceptions for ground floor commercial areas along major pedestrian corridors. The definition of "existing building" is established as one that has received a certificate of occupancy at least three years prior to the permit application for adding housing units. Overall, the bill aims to streamline the process for converting existing buildings into residential units while maintaining necessary health and safety standards.

Statutes affected:
Original Bill: 35A.21.440, 35.21.990
Bill as Passed Legislature: 35A.21.440, 35.21.990
Session Law: 35A.21.440, 35.21.990