Subdivisions Court Decisions and AG Opinions

Court Decisions

Plat application compliance with comprehensive plan.

In Fall City Sustainable Growth v. King County (2025) – Hearing examiner approved three preliminary subdivision or plat applications, even though hearing examiner also determined that the applications were not consistent with the comprehensive plan as to protecting rural character. County code provision that granted hearing examiner discretion to approve, approve with conditions, or deny plat application based on 16 laws and policies, including the comprehensive plan, did not expressly require denial of a plat application if it did not comply with every element or policy of the comprehensive plan.

"Ownership" of plat application.

Mangat v. Snohomish County (2013) – In an unusual case, the plaintiffs filed a plat application for property that was the subject of a purchase and sale agreement with the plaintiffs as purchasers. The plaintiffs defaulted on their purchase attempt, and the property owners continued the plat application process that had been started by the plaintiffs. The plaintiffs sued, alleging that allowing the property owners to continue with the plat application violated the plaintiffs' vested right to "process" the application independent of an ownership interest in the land and amounted to an unconstitutional taking of their property. The court rejected the plaintiffs' claims, holding that land use permits and permit applications run with the land and that the plaintiffs had no such vested rights, and that the plaintiffs had no property interest in the application that could be taken.

Plat restriction on further subdivision.

Jones v. Town of Hunts Point (2011), review denied (2012) – The town interpreted a restriction on the face of a 1951 plat to prevent a lot owner from subdividing his lot into two independent lots. The appellate court ruled that the town was required by local ordinance and RCW 58.17.170 to interpret and apply the plat restriction to the owner's application. In applying these requirements, the town was enforcing statutory mandates, not impermissibly conducting a private action based on a private covenant. The hearing examiner did not err by finding that the plat restriction was imposed as a limit on residential density and that it achieved that limit by preventing subdivisions like the one the owner proposed.

Innocent purchaser status rejected.

Nagle v. Snohomish County (2005) – The county correctly rejected the owner's request for innocent purchaser status under RCW 58.17.210, because the finding that the owner had "actual knowledge or notice" that the property was illegally subdivided was supported by the record and controlling law. An "innocent purchaser for value without actual notice" of an illegal subdivision of property is one who has given valuable consideration without express knowledge of the subdivision of the property.

Preliminary plat revocation.

HJS Development, Inc. v. Pierce County (2003) – Cities and counties have authority under state subdivision law to revoke preliminary plat approvals if a local ordinance provides that authority. The court noted, "[W]hen conditions of approval of a preliminary plat cannot be satisfied or are deliberately violated, remedial action, such as revocation, may be the only remedy."

Boundary line adjustment upheld.

City of Seattle v. Crispin (2003) – A reconfiguration of boundary lines that does not result in the creation of additional lots is a boundary line adjustment is exempt under RCW 58.17.040(6) from local and state platting requirements. This exemption applies even when a boundary line adjustment creates a new buildable site.

Mineral rights owner's signature not required.

Harrison v. County of Stevens (2003) – When the mineral rights to real property are reserved or granted to a party other than the holder of the fee title, the title to the surface and the title to the mineral rights are severed and ownership of the surface becomes separate and distinct from ownership of the mineral rights. Thus, the signature of owner of mineral rights in that circumstance was not required on the surface owners' short plat application to subdivide their property.

Liability waiver.

Howe v. Douglas County (2002) – Where local governments must, by law, accept streets, public areas, and other improvements constructed by a private developer, they may limit their liability for harms caused by the private developer. That is precisely what RCW 58.17.165 requires, and impliedly what it authorizes. However, the statute is limited to certain circumstances: to plat subdivisions subject to a dedication; to damage occasioned to the "adjacent land"; to roads and the associated drainage systems; and to that infrastructure at the time it is dedicated to the local government.

Road improvements as condition of plat approval

Benchmark Land Co. v. City of Battle Ground (1999) – A preliminary plat application is not "approved" until the local legislative body giving its approval enters a written decision that includes findings of fact and conclusions of law as required by RCW 58.17.100. An oral decision is not binding. Also, a local ordinance generally requiring subdivision developers to improve the streets fronting their proposed developments as a standard regulation of new subdivisions does not absolve the local jurisdiction of its duty to conduct a site-specific inquiry into whether and to what extent a proposed subdivision will impact an adjoining street before it may condition preliminary plat approval of the subdivision on the developer's making specified street improvements.

Select Attorney General Opinions

Regulation of old plats.

AGO 1998 No. 4 – The Growth Management Act (GMA) does not obligate a county to require the replatting of lands in the county that are outside any urban growth area and that were platted before 1937, but allows local flexibility in applying GMA standards to such lands.

AGO 1996 No. 5 – The requirements of chapter 58.17 RCW apply to land platted under predecessor statutes. Cities and counties may accept plats and subdivisions filed pursuant to the 1937 platting act (chapter 58.16 RCW, which was repealed in 1969), but are not obligated to do so. See also AGLO 1974 No. 7.

Sale of portion of property requires short platting

AGO 1983 No. 31 – Offer to sell a portion of a larger tract of land or the execution of a purchase and sale agreement covering such a tract of land, constitutes a "division" of land under the definition of a "short subdivision" contained in RCW 58.17.020(6) or (7).