Housing (Zoning)

SB 5552 aims to create a new category of building codes specifically for "kit homes" to increase affordable housing options. The bill defines kit homes as residential structures 800 square feet or smaller, built from prefabricated walls, floors, and roofs assembled on-site. It directs the State Building Code Council to establish these specific building codes for kit homes by December 31, 2025. This initiative is intended to provide more affordable small homes for homebuyers of modest means.

HB 1840 authorizes counties to allow "middle housing" (like duplexes, triplexes, or townhouses) in designated unincorporated urban growth areas, specific rural development zones, and established communities. It requires at least one middle housing unit per single-family lot in urban areas and limits these developments to four units per lot in rural zones. The bill mandates that counties apply the same zoning, permit, and environmental rules to middle housing as to single-family homes, while requiring sewer service for rural middle housing. This policy aims to increase housing density without new infrastructure, directly affecting homeowners and developers in targeted areas.

SB 5555 requires cities and code cities in Washington to allow housing units in existing ground-floor commercial, retail, or mixed-use buildings within specific transit-accessible areas (e.g., within 1/2 mile of light rail stops or 1/4 mile of bus rapid transit stops). It removes parking requirements, limits density restrictions (allowing up to 50% more units within existing building envelopes), and eliminates design standards for residential conversions in qualifying buildings. The bill also mandates that cities permit taller buildings using mass timber products in commercial zones and prohibits requirements like transportation studies for such conversions. These changes apply to buildings with a certificate of occupancy at least three years old, directly affecting property owners, developers, and local zoning regulations in participating jurisdictions.

SB 5755 incentivizes converting underutilized commercial properties into residential housing by creating a state review process for eligible projects. It requires property owners to submit detailed proposals by October 1, 2025, including location details, infrastructure needs, and affordability plans. Eligible projects must be in urban areas with at least 250 new units, avoid sensitive zones or historic sites, and score high on criteria like low-income housing, environmental features, and community benefits. High-priority projects receive streamlined permits (processed within 180 days), technical assistance, and priority for state funding to accelerate development. This directly affects developers and property owners seeking to redevelop commercial sites into mixed-income housing near transit and jobs.

This bill allows cities and counties in Washington to permit factory-built "kit homes" (structures under 800 square feet assembled on-site) in residential zones for emergency housing. It requires local governments to adopt inspection processes ensuring these homes meet safety standards at least every five years. The bill eliminates minimum floor area requirements for single-family homes and permits kit homes in areas designated for residential use or emergency housing. It directly affects local zoning authorities, housing providers, and residents seeking temporary housing solutions.