HB 1840
In CommitteeHouse
Middle housing
Authorizing middle housing in unincorporated growth areas and unincorporated urban growth areas, certain limited areas of more intensive rural development, and fully contained communities.
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 requires counties to allow middle housing (like duplexes or townhomes) on at least one parcel per single-family zone in urban growth areas, and up to four units per lot in designated rural development zones, while limiting regulatory barriers and appeal rights. It also prevents legal challenges to such local housing policies under state environmental and planning laws.
- Counties must allow at least one middle housing unit on each parcel zoned for single-family homes in urban growth areas.
- In limited areas of more intensive rural development, counties may allow up to four residential units per lot, but must ensure the units are connected to sewer service.
- Middle housing must meet the same development standards (e.g., setbacks, stormwater, tree canopy) as detached single-family homes — no stricter rules allowed.
- Middle housing projects must go through the same permit and environmental review processes as single-family homes, unless state laws (e.g., shoreline, building, or energy codes) require otherwise.
- Actions taken by counties to implement this law cannot be appealed through the Growth Management Hearings Board or courts under the State Environmental Policy Act (SEPA).
Who is affected
- Counties — Counties must allow at least one middle housing unit on each parcel zoned for single-family homes in urban growth areas and up to 4 units per lot in designated rural development areas, with specific regulatory requirements.
- Property owners — Property owners in eligible areas gain the right to build middle housing (e.g., duplexes, townhomes, courtyard housing) on their land without needing special exceptions or variances, provided they meet the same standards as single-family homes.
- Developers and builders — Developers and builders can propose and construct middle housing projects more easily in urban growth areas and limited rural zones, as the bill limits regulatory barriers and appeal rights.
- Residents — Residents in urban and rural growth areas may see increased housing options and potentially more affordable housing choices as a result of increased density allowed under the law.
Pro/Con Analysis
Stronger case for benefits
Potential Benefits (5)
The mandate to allow at least one middle housing unit per single-family parcel in urban growth areas significantly expands housing supply options — particularly for renter households, young professionals, and lower-income families — by enabling duplexes, townhomes, and courtyard housing where single-family-only zoning has long restricted density.
HousingPeopleRef: Sec. 1(1), Sec. 1(2)By prohibiting stricter regulatory standards for middle housing than for single-family homes, the bill reduces permitting uncertainty and compliance costs for developers and property owners, making middle housing projects more feasible and potentially lowering housing prices relative to single-family homes.
HousingPeopleRef: Sec. 1(2)(a), Sec. 1(2)(b)Eliminating appeal rights for implementation actions reduces legal delays and administrative costs for counties, potentially accelerating project approvals and reducing taxpayer spending on litigation related to housing projects.
Local GovernmentPeopleRef: Sec. 2(4), Sec. 3(1)(a)Developers and builders gain clearer regulatory pathways to propose and build middle housing in urban growth areas, which may increase construction activity, create local jobs, and stimulate ancillary service industries — though benefits are likely concentrated among larger firms with scale and legal capacity.
Business & EmploymentLean peopleRef: Sec. 1(1), Sec. 1(2)By enabling more efficient land use (fewer, smaller lots per unit), middle housing can reduce per-capita sprawl, vehicle miles traveled, and greenhouse gas emissions — though this benefit depends on配套 infrastructure and transit access, which the bill does not mandate.
EnvironmentPeopleRef: Sec. 1(1), Sec. 1(2)
Potential Concerns (5)
The bill imposes unfunded mandates on counties by requiring them to revise zoning and development regulations to permit middle housing in urban growth areas and designated rural zones, without providing state funding to support implementation (e.g., infrastructure upgrades, planning staff, permitting capacity).
Local GovernmentRef: Sec. 1(1), Sec. 2(4), Sec. 3(1)(a)While the bill allows up to four units per lot in rural development zones, it requires sewer service — a costly infrastructure constraint that may limit implementation to areas already served by municipal utilities or require counties to invest in new sewer infrastructure, potentially delaying or preventing middle housing in many rural areas.
HousingRef: Sec. 1(2)(c), Sec. 1(1)The requirement that middle housing meet the *same* (not relaxed) development standards as single-family homes — including setbacks, lot coverage, and tree canopy rules — may limit density gains and affordability, especially on smaller or irregular lots, reducing the practical impact of the mandate.
HousingLean peopleRef: Sec. 1(2)(a), Sec. 1(2)(b)By prohibiting appeals to the Growth Management Hearings Board and courts under SEPA for actions taken to implement this law, the bill restricts legal recourse for residents and environmental groups seeking to challenge potential environmental harms (e.g., increased runoff, tree loss, strain on water/sewer systems), weakening community input and oversight rights.
Rights & LibertiesLean peopleRef: Sec. 2(4), Sec. 3(1)(a)Without explicit requirements for off-site infrastructure upgrades (e.g., water, sewer, roads, schools), increased density from middle housing could strain existing public services and emergency response capacity, especially in rapidly growing urban growth areas where infrastructure is already stressed.
Public SafetyRef: Sec. 1(1), Sec. 1(2)(a)
Who Is Most Affected
Counties face new regulatory and planning obligations without state funding, increasing administrative burden; however, they gain legal certainty and reduced appeal risk for housing actions.
Middle-class and working-class households benefit most from increased housing supply and affordability, especially in high-cost urban growth areas; however, those in neighborhoods without sewer access or transit may see limited gains.
Large developers and builders benefit from streamlined permitting and expanded development rights; small contractors and mom-and-pop builders may benefit less due to scale requirements and financing constraints.
Existing single-family homeowners may face concerns about neighborhood character, parking, or traffic — though empirical evidence suggests minimal impact on property values from middle housing in most markets.
Environmental and community groups lose legal standing to challenge housing projects under SEPA, limiting their ability to enforce environmental protections — though the bill may still support broader climate goals through denser development.