287 of the 5,866 lots in Roy (5%) 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.
3,108 of the 5,866 lots in Roy (53%) have septic records on file with the Tacoma-Pierce County Health Department. 0 lots are inside a Pierce County sewer service area, and 0 are within 300 feet of a sewer main on the county's sewer map.
Vacant land in Roy sold for a median of $22,000 per acre across 59 sales since November 1, 2023. Homes sold for a median of $531,500 across 440 sales. 363 new homes were permitted on its unincorporated lots since November 1, 2021. The city issues its own permits, which are not in our data yet.
Of the 5,866 lots in Roy, 2,393 touch a mapped landslide hazard area, 1,415 an erosion hazard area, 1,078 a flood area and 2,339 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 November 8, 2026.
How these numbers are worked out · Guides