The unimproved land form is not optional
Most states exempt vacant land from seller disclosure. Washington does not. RCW 64.06.015 requires a seller of unimproved residential real property to deliver a completed disclosure statement, and RCW 64.06.005 defines that as property zoned for residential use with no dwelling unit, condominium, timeshare, or manufactured home. Delivery is due within five business days of mutual acceptance unless the parties agree otherwise, and the buyer then has three business days to rescind by written notice. RCW 64.06.010 lists the exemptions — foreclosure or deed in lieu, transfers to a parent, spouse, domestic partner or child, transfers by a personal representative or bankruptcy trustee, and buyer waiver, though the environmental questions cannot be waived where the answers would be affirmative.
The Growth Management Act draws the line
Washington directs growth through the Growth Management Act, chapter 36.70A RCW. Counties planning under it designate urban growth areas under RCW 36.70A.110, and land outside those boundaries is held to rural densities with urban services generally withheld. That line, not the acreage, decides what a parcel can become. The same chapter requires counties and cities to designate critical areas under RCW 36.70A.170 and adopt regulations protecting them under RCW 36.70A.060 — wetlands, aquifer recharge areas, frequently flooded areas, geologically hazardous areas, fish and wildlife habitat — using best available science per RCW 36.70A.172. Each county writes its own critical areas ordinance, so buffer widths and review triggers differ substantially between Whatcom, Kittitas and Klickitat.
The excise tax is the seller's obligation
Washington taxes the sale itself rather than the gain. Real estate excise tax under chapter 82.45 RCW applies to the selling price, and RCW 82.45.080 makes it the seller's obligation, with the buyer liable and a lien attaching to the property if it goes unpaid. Since January 1, 2020 the state portion has been graduated by price; the Department of Revenue's current schedule starts at 1.1 percent and climbs in tiers. Land classified as agricultural land or timberland is carved out of the graduated structure and stays at a flat 1.28 percent state rate, but the buyer must indicate continued qualifying use and the county assessor must approve it. Local REET is added on top.
Current use classification has an exit price
Two programs cut the assessed value of open land, and both charge to leave. Open space, farm and agricultural land, and timber land are classified under chapter 84.34 RCW; removal triggers additional tax under RCW 84.34.108 equal to the difference between what was paid and what would have been owed for the seven years last past, plus interest at the rate charged on delinquent property taxes. Farm and agricultural land removed on or after September 1, 2025 uses a four year lookback instead. Designated forest land sits in chapter 84.33 RCW with its own compensating tax. Separately, RCW 76.09.060 treats conversion within six years of an approved forest practices application, without local consent, as a violation.