Permits through August 2026Yearly permits since 1995King County index 1975–2025
King County (100 = first year)United States, rebased to the same startNBER recession
House prices are indexed by county, not by city: this is King County's FHFA index, with the national index rebased to the same start.
Census Bureau notes: building permit figures cover new privately owned housing units authorised by permit-issuing places; permits do not mean the units were started or completed, and places that report less often than monthly are imputed in monthly totals. FHFA notes: The FHFA HPI is a broad measure of the movement of single-family house prices. The FHFA HPI is a weighted, repeat-sales index, meaning that it measures average price changes in repeat sales or refinancings on the same properties.
Seattle, Washington (King County), authorised 4,916 housing units through building permits in the 12 months to August 2026, +35.3% on the previous 12 months.
716 of those units were single-family houses (15%), 761 were in two- to four-unit buildings and 3,439 in buildings of five or more units. That is 6.3 units per 1,000 residents, above the county's 4.9 and above the state's 4.9.
Since 1995 the place has authorised 173,898 units, with the busiest year 2021 (11,980 units). King County's FHFA house price index rose +100.6% over the ten years to 2025.
4,916units permitted, 12 months to August 2026+35.3% on the previous 12 months
716single-family units15% of the total
3,439units in 5+ unit buildings70% of the total
6.3units per 1,000 residentsKing County 4.9 · Washington 4.9
Permits by month and structure type
Housing units authorised in Seattle by month, latest 24 monthssingle-family2+ unit buildings
Units, 12 months to August 2026
Seattle
King County
Washington
United States
All housing units
4,916
11,408
38,911
1,418,086
Single-family (1 unit)
716 (15%)
2,398 (21%)
17,298 (44%)
888,241 (63%)
2 units
614
662
1,294
34,814
3–4 units
147
185
618
17,298
5 or more units
3,439 (70%)
8,163 (72%)
19,701 (51%)
477,733 (34%)
Units per 1,000 residents
6.3
4.9
4.9
4.1
Change on previous 12 months
+35.3%
+41.1%
+11.4%
−0.1%
Permits by year since 1995
Housing units authorised in Seattle by year, 1995–2025single-family2+ unit buildings
173,898 units since 1995; the busiest year was 2021. Annual figures include units imputed for months a place did not report.
Home prices in King County
FHFA's index for King County rose +100.6% over the ten years to 2025 (+7.2% a year) and +0.9% in the latest year, against +113.0% and +1.8% for Washington. Full county page: decade table, peak-to-low declines, every ZIP code and every permit-issuing place in the county.
Questions and answers
How many homes are being built in Seattle, WA?
4,916 housing units were authorised by building permits in the 12 months to August 2026, against 3,634 in the previous 12 months.
What kind of housing is being permitted in Seattle?
716 single-family units, 614 in two-unit buildings, 147 in three- and four-unit buildings and 3,439 in buildings of five or more units.
How does Seattle compare with its county and state?
6.3 units per 1,000 residents in Seattle, 4.9 in King County and 4.9 in Washington.
How have home prices moved in King County?
FHFA's index for King County rose +100.6% over the ten years to 2025 and +0.9% in the latest year; the county page has the full series.
What does a permit count?
A housing unit authorised by a building permit for new privately owned residential construction, as reported to the Census Bureau Building Permits Survey by the permit-issuing office. Permits are not completions; some permitted units are never built, and places that report only annually are imputed in monthly figures.
Provenance
Permits: US Census Bureau, Building Permits Survey, place-level monthly and annual files through August 2026 (permit office 475000); county and state comparisons from the county and state files. Population: Census Bureau vintage 2025 estimates for incorporated places, matched on FIPS place code where the permit office is one. House price index: Federal Housing Finance Agency. Public domain. Corrections · Building Permits Survey.