King County, WA Local Taxes & Fees: Mansion Tax (Measure ULA) (2026)
LA Measure ULA additional transfer tax on real-estate sales above $5M (4%) and $10M (5.5%), used to fund affordable housing and homelessness prevention.
Research in progress
We are currently verifying King County's specific local ordinance for mansion tax (measure ula). In the meantime,Washington state law generally applies, and below you'll find guidance for finding the official rules and links to related King County ordinances we've already verified.
Washington State Law Context
Washington state law provides the baseline framework for mansion tax (measure ula) across all municipalities in the state. Individual cities like King County may adopt additional local rules on top of state requirements, which is what makes checking your specific city ordinance important. For King County residents, the safest approach is to follow state law as a baseline and contact City Hall for any additional local requirements.
You can browse all Washington local taxes & fees to see how cities across the state regulate this topic.
How to find official King County Mansion Tax (Measure ULA) rules
- Search for "King County WA municipal code" to find your city's online code portal (Municode, eCode360, or American Legal Publishing are the most common).
- Look for chapters covering local taxes & fees, zoning, nuisance, or property maintenance — that's where most mansion tax (measure ula) rules live.
- Contact King County City Hall's code enforcement, planning, or community development department for clarification.
- Check with your HOA if applicable — many HOAs have stricter rules than the city itself.