Basic
$1.36 – $3.31 per sq ft
Loose-fill fiberglass blown over the attic floor to an R-40 settled depth, eave baffles and depth markers set
Supply and install about R-40 attic insulation (blown-in, roughly 13-15 in) over the attic floor.
R40 Insulation in Seattle, Washington typically costs $1.60 to $3.89 per sq ft as of 2026. Prices reflect local labor and material rates. Use our calculator below for a detailed, ZIP-code-adjusted estimate.
Prices in Seattle are 19.0% higher than the national average for r40 insulation.
National average: $1.40 – $3.40 per sq ft
$1.36 – $3.31 per sq ft
Loose-fill fiberglass blown over the attic floor to an R-40 settled depth, eave baffles and depth markers set
$1.60 – $3.89 per sq ft
Blown fiberglass to R-40 with rafter baffles at the eaves, hatch dam, clearance kept around flues and recessed lights
$2 – $4.86 per sq ft
Blown fiberglass to R-40 with rafter baffles at every eave bay, hatch dam, insulated and weatherstripped hatch, depth markers
| Component | Category | Price Range | Unit |
|---|---|---|---|
| Materials | material | $0.66 – $1.59 | sq ft |
| Labor | labor | $0.66 – $1.58 | sq ft |
| Supplies & Other | supplies | $0.18 – $0.43 | sq ft |
| Equipment & Disposal | equipment | $0.11 – $0.29 | sq ft |
Labor costs in Seattle run proportionally higher than materials, which may favor material-heavy solutions.
Connect with local r40 insulation contractors in Seattle for personalized quotes based on your specific project.