326 of the 5,863 lots in Roy (6%) are zoned for houses inside an urban growth area. On those lots, Washington's HB 1337 requires the city or county to allow at least two accessory dwelling units (ADUs). Another 5,365 lots are outside the urban growth area, where Pierce County's own ADU rules decide.
3,109 of the 5,863 lots in Roy (53%) have septic records on file with the Tacoma-Pierce County Health Department. 5,510 lots are inside a Pierce County sewer service area, and 0 are within 300 feet of a county sewer main.
Vacant land in Roy sold for a median of $22,460 per acre across 56 sales since October 1, 2023. Homes sold for a median of $530,000 across 443 sales. 359 new homes were permitted on its unincorporated lots since October 1, 2021. The city issues its own permits, which are not in our data yet.
Of the 5,863 lots in Roy, 2,391 touch a mapped landslide hazard area, 1,414 an erosion hazard area, 1,911 a flood area and 2,338 an inventoried wetland, on Pierce County's maps.
From the Pierce County Assessor-Treasurer, the county's zoning, sewer, hazard and growth-area maps, and the Tacoma-Pierce County Health Department. Records as of October 2, 2026.
How these numbers are worked out · Guides