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King County Home Building Costs
2026 construction cost estimates for King County, Washington. Population: 2,300,000.
County $/sq ft
$262
Washington avg: $222
vs State Average
+18%
Local market premium
2,000 sq ft home
$524,000
Mid-range estimate
Local Market Factors
- ›Seattle/Amazon/Boeing
- ›Highest labor costs in state
- ›Tech sector premium
Cost by Home Size in King County
| Home Size | Basic | Mid-Range | Premium |
|---|---|---|---|
| 500 sq ft | $96,856 | $131,000 | $178,383 |
| 1,000 sq ft | $193,713 | $262,000 | $356,766 |
| 1,500 sq ft | $290,569 | $393,000 | $535,149 |
| 2,000 sq ft | $387,426 | $524,000 | $713,532 |
| 2,500 sq ft | $484,282 | $655,000 | $891,915 |
| 3,000 sq ft | $581,138 | $786,000 | $1,070,298 |
| 4,000 sq ft | $774,851 | $1,048,000 | $1,427,064 |
| 5,000 sq ft | $968,564 | $1,310,000 | $1,783,830 |
Costs are estimates only and represent construction costs, excluding land, architect fees, permits, and landscaping. Add 30–40% to these figures for total project cost.
County multiplier of 1.18× applied to Washington state average (which itself is 1.18× the national average of $188/sq ft).