This bill reenacts and amends portions of the Washington subdivision statutes (RCW 58.17.020 and RCW 58.17.060) and changes how short subdivisions and unit lot subdivisions are regulated. It adjusts the numeric thresholds for short subdivisions: outside urban growth areas jurisdictions must allow divisions into four or fewer lots (local ordinance may raise that to up to nine), and inside urban growth areas jurisdictions must allow nine or fewer lots and must allow up to 30 lots if the average lot size of the lots created does not exceed the jurisdiction’s minimum lot size in its comprehensive plan and development regulations. The bill requires local ordinances for short plats/short subdivisions, appointment of administrative personnel to process summary approvals, written findings for approvals per RCW 58.17.110, a five‑year limit on further division without filing a final plat (with a limited alteration exception), mandatory surveying when an ordinance requires it, and inclusion of sidewalk and student-safe walking planning features. The bill creates and clarifies procedures for unit lot subdivisions for cities and towns in counties planning under RCW 36.70A.040, including requirements about ownership of remaining parent‑lot portions (common ownership or homeowners’ association), prominent informational notes recorded on plats describing project-level approvals and constraints, and requirements that these procedures use only clear and objective design and development standards, provide specified public notice within 250 feet consistent with RCW 36.70B.110, avoid public predecision meetings/hearings and nonadministrative design review (except as state law requires), be integrated with the underlying project review, and be subject to the timing limits in RCW 36.70B.080 unless extended by mutual agreement. The bill also adds and clarifies many definitions relevant to subdivisions and requires that unit lot subdivisions notify purchasers of the unit lot legal status by June 30, 2026. This is a procedural and definitional change to land use law; it does not create a new criminal offense or change penalties in the provided text. It also states that normal public health, safety, building code, and environmental permitting requirements still apply and that the section does not authorize development in locations restricted by other laws. The text available is incomplete: portions of RCW 58.17.060 (including the remainder of subsection (3)(c) and certain referenced subsections (a) and (b)) are missing, so some specific procedural details and any additional requirements in those omitted parts cannot be confirmed from the provided facts.

If enacted, cities, towns, and counties will have to change their subdivision rules and procedures: they will need to adopt ordinances for short plats and unit lot subdivisions, assign staff to do faster “summary” approvals, and meet new deadlines for adopting these rules by mid‑2026 or mid‑2027 depending on their planning cycle. In practice this will likely speed up and broaden the ability to split land inside urban growth areas (potentially up to 30 lots when average lot sizes meet local minimums) and allow more unit lot developments to be approved with fewer public hearings and limited design review, which can lower time and procedural barriers for developers but reduce opportunities for public input and local design control. Property owners and developers will face some new upfront costs and obligations: surveys may be required with applications, buyers of unit lots must be given specific legal‑status notices by June 30, 2026, and short plats cannot be further divided for five years unless a final plat is filed or the original filer alters the short plat within that period. Local governments will carry the cost and responsibility of changing ordinances, providing staff for quicker reviews, and giving required notices to nearby property owners, and some details about denial protections and other procedural rules are missing from the provided text, so a few implementation specifics remain uncertain.