Committee reviews bill allowing detached ADUs in some rural areas with conditions
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Summary
SB 5,470 would permit counties to allow detached accessory dwelling units outside urban growth areas where limited by water/septic and siting rules; proponents said ADUs increase rural housing options while opponents urged careful calibration on density and reporting to avoid unintended impacts.
Senate Bill 5,470 (proposed substitute) would allow counties to permit detached accessory dwelling units (ADUs) outside urban growth areas if those ADUs meet statutory limits such as one ADU per parcel, site proximity (sited within 150 feet of the principal unit), water supply and septic documentation, and reporting requirements to Commerce regarding counts and short‑term rental use.
Supporters including county officials, the Master Builders Association, Realtors and the Building Industry Association said the change can expand affordable, intergenerational housing choices in rural areas, help with financing and provide legal clarity where counties already allow ADUs. Curtis Steinhardt (State Association of Counties) urged caution over a statewide mandate and recommended piloting the approach to identify regional distinctions. FutureWise testified in opposition to the presented version, raising concerns about density accounting, lot size restrictions and metering provisions; they said House amendments may offer a more workable path.
Testimony emphasized the balance between enabling rural ADUs to support family and affordable housing and avoiding unplanned rural density and infrastructure strains; questions focused on metering, population accounting, and how local ordinances would interact with a statewide standard. The committee closed the hearing and moved on to subsequent items.