Home insulation costs between $1,500 and $5,000 for most projects, with the national average around $2,800. Attic insulation is the most common and cost-effective upgrade, while spray foam insulation for the entire home costs more but delivers superior energy savings. The type of insulation, area to be covered, and R-value requirements drive the final cost.
Cost Breakdown
| Item / Type | Low | High | Average |
|---|---|---|---|
| Blown-In Attic Insulation | $1,000 | $2,500 | $1,500 |
| Fiberglass Batt Insulation | $0.50 | $1.50 | $1 per sq ft |
| Spray Foam (open-cell) | $1.00 | $2.00 | $1.50 per sq ft |
| Spray Foam (closed-cell) | $2.00 | $3.50 | $2.75 per sq ft |
| Rigid Foam Board | $0.75 | $2.00 | $1.25 per sq ft |
| Crawl Space Insulation | $1,000 | $3,500 | $2,000 |
| Wall Insulation (retrofit) | $1,500 | $5,000 | $3,000 |
| Garage Insulation | $800 | $2,500 | $1,500 |
Labor Costs
Insulation installation labor costs $0.50–$2.50 per square foot depending on the type and method. Blown-in and spray foam require specialized equipment and trained technicians, while fiberglass batts can be more labor-intensive in tight spaces.
Factors That Affect Insulation Cost
Insulation Type
Fiberglass batts are the most affordable, while closed-cell spray foam is the most expensive but offers the highest R-value per inch. Each type has specific advantages for different applications.
Area & Coverage
Attic insulation for a 1,000 sq ft attic costs far less than insulating an entire home. The total square footage of the area being insulated is the primary driver of material and labor costs.
R-Value Requirements
Climate zone determines the recommended R-value. Homes in colder regions need higher R-values (R-49 to R-60 for attics), requiring thicker insulation and higher costs.
Accessibility
Open attics and exposed walls are easy and cheap to insulate. Retrofitting insulation into enclosed wall cavities, tight crawl spaces, or cathedral ceilings adds complexity and cost.
Existing Insulation
Adding to existing insulation is simpler than starting from scratch. Removing old insulation (especially if it contains asbestos or is water-damaged) adds $1–$3 per square foot to the project.
Ready to get a real quote?
Get Free QuotesTips To Save Money On Insulation
Start with the Attic
Attic insulation can be one of the most cost-effective ways to reduce energy bills and improve comfort, with payback timing depending on the home, climate, insulation levels, and energy costs.
Check for Utility Rebates
Some insulation upgrades may qualify for available rebates or incentives, depending on location, product type, eligibility, and current program rules.
DIY Fiberglass Batts
Fiberglass batt installation in an accessible attic is one of the few insulation projects well-suited for DIY. Material costs alone run $0.50–$1.50 per square foot, saving hundreds on labor.
Air Seal First
Sealing air leaks before adding insulation dramatically improves effectiveness. Caulking and weatherstripping gaps around pipes, wires, and ducts costs under $100 and maximizes your insulation investment.