Home Insulation Cost Calculator
Compare insulation costs by type and location. Get per-square-foot pricing for fiberglass, blown-in, spray foam, and rigid board.
✓ All insulation types compared
✓ R-value recommendations
✓ DIY vs. pro cost breakdown
Additional components
Estimated Cost
$5,000
Range: $4,250 \u2013 $6,000 \u2022 $5/sq ft
Cost breakdown
Insulation Cost by Type
Insulation costs depend on the material type, R-value needed, and area to insulate. Here are current installed prices per square foot:
Fiberglass Batts: $0.50–$1.50/sqft — R-3.2 per inch, DIY-friendly
Blown-In Cellulose: $1.00–$2.00/sqft — R-3.5 per inch, good for attics
Open-Cell Spray Foam: $1.50–$3.00/sqft — R-3.7 per inch, air sealing included
Closed-Cell Spray Foam: $3.00–$7.00/sqft — R-6.5 per inch, moisture barrier + structural
Rigid Foam Board: $1.50–$4.00/sqft — R-5 per inch, best for crawl spaces/basements
Where to Insulate (Priority Order)
- 1. Attic: Biggest ROI — 30–40% of home heat loss occurs through the roof
- 2. Exterior walls: 20–25% of heat loss, but harder to retrofit
- 3. Crawl space / basement: 10–15% of heat loss, prevents moisture problems
- 4. Rim joists / band boards: Often overlooked, easy to seal with spray foam
Example: 1,500 sqft Attic Insulation
Fiberglass batts (R-38): $1,200–$2,250
Blown-in cellulose (R-49): $1,500–$3,000
Open-cell spray foam (R-38): $2,250–$4,500
Closed-cell spray foam (R-38): $4,500–$10,500
❄️ Energy Savings
Proper insulation reduces heating and cooling costs 20–40%. The average U.S. homeowner saves $200–$600/year, meaning most insulation projects pay for themselves in 3–7 years.