Attic Insulation Cost Calculator
Estimate the total cost to insulate your attic based on square footage, insulation type, current R-value, and desired R-value.
Formulas Used
Additional R-Value Needed:
ΔR = Rdesired − Rcurrent
Insulation Thickness Required:
Inches = ΔR ÷ R-value per inch of chosen material
Material Cost:
Material Cost ($) = Area (sq ft) × Inches Needed × Material Cost per sq ft per inch
Labor Cost (Professional):
Labor Cost ($) = Area (sq ft) × Labor Rate ($/sq ft)
Removal Cost (if applicable):
Removal Cost ($) = Area (sq ft) × $1.50/sq ft
Total Cost:
Total ($) = Material Cost + Labor Cost + Removal Cost
Estimated Annual Energy Savings:
Savings ≈ (ΔR ÷ Rdesired) × 25% heat loss factor × $2,200 avg annual energy bill
Payback Period:
Payback (years) = Total Cost ÷ Annual Energy Savings
Assumptions & References
- R-value per inch: Fiberglass Batt 3.2, Blown Fiberglass 2.5, Blown Cellulose 3.7, Open-Cell Spray Foam 3.7, Closed-Cell Spray Foam 6.5, Mineral Wool 3.3 — per U.S. DOE Energy Saver.
- Material and labor cost rates are national averages sourced from HomeAdvisor and Angi (2024).
- DOE recommended R-values: R-30 to R-60 for attics depending on climate zone — DOE Insulation Guide.
- Old insulation removal averages $1.00–$2.00/sq ft nationally; $1.50 used as midpoint.
- Average U.S. household energy bill of $2,200/year from U.S. EIA (2023).
- Attic heat loss accounts for approximately 25% of total home heat loss per DOE estimates.
- Energy savings are estimates only; actual savings depend on climate, HVAC efficiency, air sealing, and usage patterns.
- DIY cost excludes labor; professional installation includes equipment, setup, and cleanup.
- Federal tax credits may apply: up to 30% of insulation costs under the Inflation Reduction Act (IRA 2022).