Basic
$4.26 – $6.25 per sq ft
2 in. XPS rigid foam (about R-10) on foundation walls, seams taped, rim joists insulated with cut foam, ready for code covering
How Much Does Insulate Basement Cost in Seattle, Washington?
Insulate Basement: national installed price range, materials and labor breakdown, and local pricing by ZIP code.
Insulate Basement in Seattle, Washington typically costs $5.01 to $7.35 per sq ft as of 2026. Prices reflect local labor and material rates. Use our calculator below for a detailed, ZIP-code-adjusted estimate.
Insulate Basement in Seattle, Washington
$5.01 – $7.35
per sq ftPrices in Seattle are 19.0% higher than the national average for insulate basement.
National average: $4.38 – $6.42 per sq ft
What you get at each price level
Standard
$5.01 – $7.35 per sq ft
2 in. XPS rigid foam (about R-10) on foundation walls, seams taped, rim joists foamed in place, ready for code covering
Premium
$6.27 – $9.19 per sq ft
2 in. XPS rigid foam (about R-10) on foundation walls, seams taped, top and bottom edges foam-sealed, rim joists foamed in place
Cost Breakdown in Seattle
| Component | Category | Price Range | Unit |
|---|---|---|---|
| Materials | material | $2.05 – $3.01 | sq ft |
| Labor | labor | $2.05 – $3.02 | sq ft |
| Supplies & Other | supplies | $0.55 – $0.80 | sq ft |
| Equipment & Disposal | equipment | $0.36 – $0.53 | sq ft |
Prices adjusted for Seattle local market conditions.
Cost Factors in Seattle, Washington
What Affects Pricing
- Materials ($1.97-$2.89 per square foot)
- Labor ($1.53-$2.25 per square foot)
- Supplies & Other ($4.38-$6.42 per square foot)
- Equipment & Disposal ($4.38-$6.42 per square foot)
Local Price Adjustments
Material costs4.0% above avg
Labor costs34.0% above avg
Labor costs in Seattle run proportionally higher than materials, which may favor material-heavy solutions.
Frequently Asked Questions
How we price this
BuildX Pro researches and reviews the national price range for Insulate Basement, then adjusts it to your ZIP code for local labor and material costs using the public data below. Last checked Sep 2026.
- Construction wages by metro and rural area, used for the labor adjustment by ZIP code, U.S. Bureau of Labor Statistics, Occupational Employment and Wage Statistics, May 2025
- Regional price parities for goods, used for the materials adjustment by ZIP code, U.S. Bureau of Economic Analysis, 2024
Get Free Estimates in Seattle
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