HB 2346
In CommitteeHouse
Middle housing/perf. codes
Concerning performance-based building codes for middle housing.
This status may be delayed. See Action History below for the latest updates.
How does a bill become law?
- Introduced: The bill is filed and assigned a number.
- Committee: A subject-matter committee holds hearings, takes public testimony, and decides whether to advance the bill.
- Floor Vote: The full chamber (House or Senate) debates and votes on the bill.
- Opposite Chamber: The bill repeats the committee and floor vote process in the other chamber.
- Governor: The Governor reviews the bill and decides whether to sign or veto it.
- Signed: The bill has been signed into law.
AI Analysis
This bill creates a new state-level, performance-based building code pathway for middle housing—like townhomes, duplexes, and small apartment buildings—to reduce permitting uncertainty and support off-site construction. It allows builders to use third-party certifications to prove compliance instead of following rigid, prescriptive rules, and requires alignment with energy and climate goals.
- Requires the State Building Code Council to adopt a new mandatory appendix to the International Building Code that creates a performance-based compliance pathway for middle housing buildings (1–6 stories, up to 24 units).
- Establishes a technical advisory group—including state agencies and university experts—to develop performance criteria for building systems, components, and materials, using nationally recognized standards.
- Allows housing systems and building plans certified by independent third-party evaluators to be recognized as compliant with state building code, and mandates local jurisdictions accept those certifications.
- Requires the performance-based pathway to align with existing energy and greenhouse gas emissions rules, enabling coordinated compliance using whole-building metrics instead of duplicative reviews.
- Directs the State Building Code Council to finalize rules in time for implementation in the first major state building code update after January 1, 2027.
Who is affected
- Developers and builders of middle housing — Developers and builders of middle housing (e.g., townhomes, duplexes, triplexes, ADUs, and small apartment buildings) will gain access to a standardized, state-approved path to demonstrate building code compliance using performance-based methods—potentially reducing permitting delays and costs.
- Local building departments and permitting agencies — Local governments (city and county building departments) will be required to accept third-party certifications for middle housing systems that meet state standards, streamlining permit reviews and reducing inconsistent local interpretations.
- Off-site housing manufacturers and industrialized construction firms — Manufacturers of off-site or industrialized housing components (e.g., modular or panelized systems) may benefit from repeatable, state-recognized compliance pathways, enabling faster scaling and broader market access.
- State agencies involved in building code and housing policy — State agencies—including the Department of Labor & Industries, Department of Commerce, and universities—will help develop and review performance standards, supporting coordination across housing, energy, and climate goals.
Pro/Con Analysis
Stronger case for benefits
Potential Benefits (5)
Standardized third-party certification reduces permitting delays and costs for middle housing developers, which—combined with existing state housing goals—should increase supply of townhomes, duplexes, and small apartments, improving affordability and choice for middle-income households.
HousingPeopleRef: Sec. 2(5)Mandating whole-building or system-level metrics for energy and emissions compliance reduces duplicative reviews and encourages integrated design, which can lower both operational and embodied carbon—benefiting long-term climate resilience and reducing utility costs for residents.
EnvironmentPeopleRef: Sec. 2(4)Off-site manufacturers and modular builders gain a predictable, scalable compliance pathway, enabling investment in industrialized construction capacity, which can create skilled manufacturing jobs and reduce labor bottlenecks on-site.
Business & EmploymentPeopleRef: Sec. 2(5)Involving University of Washington and WSU in technical advisory work leverages public research expertise to develop evidence-based standards, potentially improving building science education and workforce training pipelines.
EducationPeopleRef: Sec. 2(2), Sec. 2(3)By requiring local jurisdictions to accept state-certified systems, the bill reduces inconsistent interpretations and repetitive reviews, lowering administrative burden on small municipalities with limited building department staffing.
Local GovernmentLean peopleRef: Sec. 2(1), Sec. 2(5)
Potential Concerns (5)
Reliance on third-party certifications may reduce local jurisdiction’s ability to verify compliance with local conditions (e.g., seismic zones, soil stability, or fire-prone terrain), potentially compromising safety if third-party evaluators apply generic standards without local context.
Public SafetyPeopleRef: Sec. 2(5)While intended to increase housing supply, the bill’s focus on middle housing (1–24 units) may not directly address the most acute shortages of affordable units for low-income households, as developers may prioritize market-rate units that yield higher returns under streamlined permitting.
HousingPeopleRef: Sec. 2(1), Sec. 2(5)Local governments lose discretionary authority to reject or modify third-party certifications, reducing their ability to enforce local land-use priorities (e.g., open space, traffic mitigation, or neighborhood character) even when those priorities are reasonable and evidence-based.
Local GovernmentLean peopleRef: Sec. 2(5)The bill assumes minimal additional state administrative costs, but if implementation requires new staff, training, or oversight infrastructure beyond existing resources, local governments may absorb indirect costs through increased demand for inspections or legal challenges to certifications.
FinancialRef: Fiscal Impact sectionWhile the bill aims to align with energy and emissions goals, it does not mandate minimum performance thresholds for embodied carbon or lifecycle emissions—only that compliance be “coordinated” with existing programs—raising concerns that cost-driven performance metrics could undermine climate goals if not rigorously enforced.
EnvironmentPeopleRef: Sec. 2(4)
Who Is Most Affected
Developers of middle housing gain a faster, more predictable path to compliance, reducing soft costs (permits, legal reviews, design iterations). However, they may still face market constraints (e.g., land costs, demand signals), and the benefit is largest for firms with capital to invest in certified systems.
Local governments lose discretionary review authority but gain predictability and reduced legal risk from inconsistent enforcement. Small towns with limited staff may benefit from streamlined reviews, while affluent suburbs may resist denser housing despite the mandate.
Off-site manufacturers (e.g., modular homes, panelized systems) benefit most directly from standardized, repeatable certification—potentially increasing their market share and enabling regional or national expansion. This could lower construction costs over time.
State agencies (L&I, Commerce) gain expanded roles in housing innovation but face new responsibilities for oversight and coordination. Their influence in shaping sustainable building standards increases, though budget constraints may limit implementation capacity.
Low- and middle-income households stand to benefit from increased supply and potential price moderation, but only if the new housing includes affordability covenants or inclusionary zoning—neither required by this bill. Without such safeguards, the impact may be modest.