12,830 of the 17,284 lots in Spanaway (74%) 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 4,327 lots are outside the urban growth area, where Pierce County's own ADU rules decide.
5,764 of the 17,284 lots in Spanaway (33%) have septic records on file with the Tacoma-Pierce County Health Department. 17,283 lots are inside a Pierce County sewer service area, and 9,706 are within 300 feet of a county sewer main.
Vacant land in Spanaway sold for a median of $137,037 per acre across 25 sales since October 1, 2023. Homes sold for a median of $495,000 across 2,118 sales. 1,036 new homes were permitted since October 1, 2021.
Of the 17,284 lots in Spanaway, 3,272 touch a mapped landslide hazard area, 1,184 an erosion hazard area, 791 a flood area and 745 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