Attic Insulation Cost 2025: Types, Prices & Energy Savings
Proper attic insulation can cut heating and cooling costs by up to 20%. In 2025, attic insulation costs range from $1,500 to $3,500 for a typical 1,500 sq ft attic.
Insulation Cost by Type
| Type | Cost per Sq Ft | R-Value per Inch |
|---|---|---|
| Blown-in fiberglass | $1.00–$2.00 | R-2.2–R-2.7 |
| Blown-in cellulose | $1.00–$1.80 | R-3.1–R-3.8 |
| Spray foam (open cell) | $0.44–$0.65/board ft | R-3.5 |
| Spray foam (closed cell) | $1.00–$2.00/board ft | R-6.5 |
| Batt insulation | $0.50–$1.50 | R-3.1–R-3.8 |
Recommended R-Values by Climate Zone
The US Department of Energy recommends R-38 to R-60 for attics depending on your climate zone. Most existing homes fall short of this — upgrading is one of the best ROI improvements you can make.
Energy Savings from Attic Insulation
- Average annual savings: $250–$600
- Payback period: typically 3–5 years
- Available federal tax credit: up to $1,200 (30% of cost)
DIY vs Professional Installation
Blown-in insulation typically requires renting a machine ($100–$200/day) and a helper. Batt insulation is more DIY-friendly. Spray foam should always be installed by professionals due to chemical hazards and precise application requirements.