A 2-minute self-check for Federal Way homeowners weighing a 2026 property tax appeal, with six signals that flag an overassessed King County home.
The 2026 King County filing window runs through July 1, or 60 days from your Official Property Value Notice mail date, whichever is later. Federal Way is not one housing market: Dumas Bay waterfront, Twin Lakes mid-century homes, Mirror Lake split-levels, South 320th infill, and Pacific Highway South corridor parcels price differently.
What to do next
If the self-check raised a question, you can look it over yourself, or use FairAppeal to see if you are overpaying.
For the broader context, see the Federal Way property taxes guide or the 2026 King County property tax appeal guide.
Look up if you are overpaying on your Federal Way home.
King County reassesses every home every year and leans on neighborhood comps without seeing condition.