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How Much Does R40 Insulation Cost in Seattle, Washington?

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.

R40 Insulation in Seattle, Washington

$1.60 – $3.89

per sq ft

Prices in Seattle are 19.0% higher than the national average for r40 insulation.

National average: $1.40 – $3.40 per sq ft

What you get at each price level

  • 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

  • Standard

    $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

  • Premium

    $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

Cost Breakdown in Seattle

ComponentCategoryPrice RangeUnit
Materialsmaterial$0.66 – $1.59sq ft
Laborlabor$0.66 – $1.58sq ft
Supplies & Othersupplies$0.18 – $0.43sq ft
Equipment & Disposalequipment$0.11 – $0.29sq ft
Prices adjusted for Seattle local market conditions.

Cost Factors in Seattle, Washington

What Affects Pricing

  • Materials ($0.63-$1.53 per square foot)
  • Labor ($0.49-$1.18 per square foot)
  • Supplies & Other ($0.17-$0.41 per square foot)
  • Equipment & Disposal ($0.11-$0.28 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

References

Get Free Estimates in Seattle

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