Insulation Cost Calculator
Average insulation costs range from $1,500 to $6,500 depending on insulation type, area size, and labor rates in your area.
Reviewed by MyProjectCost Team
Key takeaway: Insulation costs range from $0.25–$2.00 per sq ft for materials alone, or $1,500–$6,500 installed for a typical home. Spray foam costs the most ($1.00–$2.00/sq ft) but delivers the highest R-value and air sealing. Blown-in and batt insulation are the most affordable options for attics and walls.
Definition: Insulation cost is the total price of purchasing and installing thermal or acoustic insulation material in walls, attic, floors, or crawl spaces — including spray foam, blown-in, batt, or rigid board insulation plus contractor labor.
Who should use this calculator? This insulation cost calculator is designed for homeowners, landlords, contractors, and energy auditors budgeting insulation upgrades, evaluating attic insulation cost, planning new construction insulation, or comparing insulation types before requesting contractor quotes.
Average Insulation Cost by Type
| Type | Cost Per Sq Ft | 1,000 Sq Ft Total | Lifespan |
|---|---|---|---|
| Spray Foam | $1.50–$3.50 | $1,500–$3,500 | 80+ years |
| Blown-In Cellulose | $0.80–$2.00 | $800–$2,000 | 20–30 years |
| Batt Fiberglass | $0.50–$1.50 | $500–$1,500 | 10–25 years |
| Rigid Foam Board | $1.00–$2.50 | $1,000–$2,500 | 50+ years |
| Mineral Wool | $1.20–$2.80 | $1,200–$2,800 | 30–50 years |
| Blown-In Fiberglass | $0.70–$1.80 | $700–$1,800 | 20–30 years |
Our insulation cost data is compiled from licensed contractor invoices and homeowner project reports across all 50 states, updated quarterly. Unit costs reflect contractor-tier pricing — not retail estimates. Labor rates reflect regional averages and vary significantly by market. All figures reflect 2026 pricing and exclude local sales tax and permit fees.
Insulation Cost by Location
| Location | Average Cost | Notes |
|---|---|---|
| Attic | $1,500–$4,500 | Most common project |
| Walls | $2,000–$6,000 | Requires drilling/patching |
| Crawl Space | $1,200–$3,500 | Moisture barrier often needed |
| Basement | $1,800–$5,000 | Rim joists + walls |
| Garage | $800–$2,500 | Doors + ceiling |
| Whole House | $5,000–$15,000 | Full retrofit |
Insulation Cost by State (2026)
Average installed cost for a 1,000 sq ft attic insulation project, professionally installed.
| State | Low Estimate | Average Cost | High Estimate |
|---|---|---|---|
| Alabama | $1,200 | $2,600 | $4,000 |
| Alaska | $2,500 | $5,000 | $7,500 |
| Arizona | $1,300 | $2,750 | $4,200 |
| Arkansas | $1,200 | $2,500 | $3,800 |
| California | $2,000 | $4,250 | $6,500 |
| Colorado | $1,600 | $3,300 | $5,000 |
| Connecticut | $1,800 | $3,650 | $5,500 |
| Delaware | $1,600 | $3,300 | $5,000 |
| Florida | $1,300 | $2,750 | $4,200 |
| Georgia | $1,300 | $2,750 | $4,200 |
| Hawaii | $2,200 | $4,600 | $7,000 |
| Idaho | $1,400 | $2,950 | $4,500 |
| Illinois | $1,600 | $3,300 | $5,000 |
| Indiana | $1,400 | $2,950 | $4,500 |
| Iowa | $1,300 | $2,750 | $4,200 |
| Kansas | $1,300 | $2,650 | $4,000 |
| Kentucky | $1,300 | $2,750 | $4,200 |
| Louisiana | $1,300 | $2,750 | $4,200 |
| Maine | $1,700 | $3,450 | $5,200 |
| Maryland | $1,700 | $3,450 | $5,200 |
| Massachusetts | $2,000 | $4,000 | $6,000 |
| Michigan | $1,500 | $3,150 | $4,800 |
| Minnesota | $1,600 | $3,400 | $5,200 |
| Mississippi | $1,200 | $2,500 | $3,800 |
| Missouri | $1,400 | $2,950 | $4,500 |
| Montana | $1,500 | $3,150 | $4,800 |
| Nebraska | $1,300 | $2,750 | $4,200 |
| Nevada | $1,500 | $3,150 | $4,800 |
| New Hampshire | $1,800 | $3,650 | $5,500 |
| New Jersey | $1,900 | $3,850 | $5,800 |
| New Mexico | $1,400 | $2,950 | $4,500 |
| New York | $2,000 | $4,250 | $6,500 |
| North Carolina | $1,400 | $2,950 | $4,500 |
| North Dakota | $1,400 | $2,950 | $4,500 |
| Ohio | $1,400 | $2,950 | $4,500 |
| Oklahoma | $1,300 | $2,650 | $4,000 |
| Oregon | $1,700 | $3,450 | $5,200 |
| Pennsylvania | $1,600 | $3,300 | $5,000 |
| Rhode Island | $1,900 | $3,850 | $5,800 |
| South Carolina | $1,300 | $2,750 | $4,200 |
| South Dakota | $1,300 | $2,750 | $4,200 |
| Tennessee | $1,300 | $2,750 | $4,200 |
| Texas | $1,400 | $2,950 | $4,500 |
| Utah | $1,500 | $3,150 | $4,800 |
| Vermont | $1,800 | $3,650 | $5,500 |
| Virginia | $1,600 | $3,300 | $5,000 |
| Washington | $1,800 | $3,650 | $5,500 |
| West Virginia | $1,300 | $2,750 | $4,200 |
| Wisconsin | $1,500 | $3,150 | $4,800 |
| Wyoming | $1,400 | $2,950 | $4,500 |
How Much Does Insulation Cost?
Insulation costs $1,500 to $6,500 for a typical home insulation project, with most homeowners spending around $3,000 for attic insulation.
The national average cost to insulate a home ranges from $1,500 to $6,500 for a typical project, with most homeowners spending around $3,000 for attic insulation. Proper insulation is one of the highest-ROI home improvements available — the U.S. Department of Energy estimates homeowners can save up to 15% on heating and cooling bills by properly sealing and insulating their homes.
If your home was built before 1980, there's a strong chance your insulation is degraded, compressed, or below current energy code standards. Modern R-value recommendations for attics range from R-38 to R-60 depending on your climate zone. Upgrading old insulation typically pays for itself in 3–7 years through reduced utility bills, with utility rebates from programs like ENERGY STAR often covering 10–30% of project costs.
Spray Foam Insulation Cost Calculator
Spray foam is the most effective insulation type available, costing $1.50 to $3.50 per square foot installed. Open-cell spray foam ($0.50–$1.00/sqft material only) is lighter and more affordable, reaching R-3.5 per inch — ideal for interior walls and attics. Closed-cell spray foam ($1.00–$2.00/sqft material) is denser and achieves R-6 to R-7 per inch, making it excellent for exterior applications, crawl spaces, and areas requiring a vapor barrier.
For a 1,000 sq ft attic, spray foam installation runs $2,500 to $4,500 professionally installed. The higher upfront cost is offset by its 80+ year lifespan, superior air sealing, and 15–20% average reduction in energy bills. Many contractors offer free energy audits to determine whether spray foam is the right solution for your specific situation.
Attic Insulation Cost Calculator
Attic insulation is the most common and cost-effective insulation project for homeowners. A typical 1,000 sq ft attic insulation job costs $1,500 to $4,500 depending on the type of insulation and current R-value. Blown-in cellulose or fiberglass is the most popular choice for existing attics because it can be installed over existing insulation without removing it, reducing labor costs significantly.
Current Energy Star recommendations call for R-38 to R-60 in attics depending on climate zone. Homes in cold northern climates (zones 5–7) should target R-49 to R-60, while southern climates (zones 1–3) can achieve code compliance with R-30 to R-38. Installing a radiant barrier in addition to attic insulation can further reduce cooling costs by 5–10% in hot climates.
Blown-In Insulation Cost Calculator
Blown-in insulation (also called loose-fill) costs $0.80 to $2.00 per square foot installed for cellulose, or $0.70 to $1.80/sqft for fiberglass. This translates to $800–$2,000 for a 1,000 sq ft attic professionally installed. Blown-in is the preferred choice for adding insulation to existing attics because it fills irregular spaces and settles evenly over existing material.
One major advantage of blown-in insulation: Home Depot and Lowe's offer free blower rental when you purchase a minimum number of insulation bags, making it a viable DIY option. A 1,000 sq ft attic typically requires 20–30 bags at $25–$45 each, bringing DIY material costs to $500–$1,350 — roughly half the professional installation price.
Insulation Cost Per Square Foot
Insulation costs range significantly by type. Fiberglass batt is the most affordable at $0.50–$1.50/sqft installed, followed by blown-in fiberglass at $0.70–$1.80/sqft and blown-in cellulose at $0.80–$2.00/sqft. Rigid foam board runs $1.00–$2.50/sqft and is commonly used in basements and exterior sheathing. Mineral wool (rock wool) costs $1.20–$2.80/sqft and offers excellent fire resistance and sound dampening. Spray foam is the premium option at $1.50–$3.50/sqft but delivers the highest R-value per inch and longest lifespan.
Does New Insulation Save Money?
Yes — new insulation typically cuts heating and cooling costs by about 15%, saving $300–$600 per year for a typical home.
Yes — upgrading insulation typically reduces heating and cooling costs by an average of 15%, with some homes seeing savings of 20–30% depending on existing insulation levels. For a home spending $2,000 per year on energy, that's $300–$600 in annual savings. At those rates, a $2,500 attic insulation project pays for itself in 4–8 years.
Federal tax credits and utility rebates make the economics even better. The Inflation Reduction Act provides a 30% tax credit (up to $1,200/year) for qualifying insulation improvements through 2032. Many utility companies also offer rebates of $0.10–$0.50 per square foot of added insulation. Combined with energy savings, these incentives can cut your net project cost by 40–50%. Check the DSIRE database and your utility company's website for rebates available in your area.
Garage Insulation Cost Calculator
Insulating a garage costs $800 to $2,500 depending on size and scope. An attached garage shares walls with living space, making it a priority insulation zone — uninsulated garage walls are a major source of heat loss in winter and heat gain in summer. Fiberglass batt insulation is the most common choice for garage walls and ceiling at $0.50–$1.50/sqft installed.
Insulating a garage door adds $200–$500 and can significantly reduce temperature swings if you use the garage as a workspace. DIY garage door insulation kits cost $50–$150 and take about 2 hours to install. For the full garage including walls, ceiling, and door, expect to spend $1,200–$3,000 professionally installed for an average 2-car garage.
Frequently Asked Questions
Insulation costs $0.50 to $3.50 per square foot installed depending on type. Fiberglass batt is cheapest at $0.50–$1.50/sqft while spray foam runs $1.50–$3.50/sqft. Blown-in cellulose falls in the middle at $0.80–$2.00/sqft and is popular for attics.
Insulating a 1,000 sq ft attic costs $1,500 to $4,500 depending on insulation type and current R-value. Blown-in cellulose averages $1,500–$2,500 for this size, while spray foam can run $2,500–$4,500. Adding insulation over existing material is less expensive than a full replacement.
Fiberglass batt insulation is the most affordable at $0.50 to $1.50 per square foot installed, making it popular for DIY projects and new construction. Blown-in fiberglass is similarly priced at $0.70–$1.80/sqft and is easy to install in attics using rental equipment from Home Depot.
Yes for most homeowners. Spray foam costs more upfront at $1.50–$3.50/sqft but provides superior air sealing, lasts 80+ years, and can reduce energy bills by 15–20%. Closed-cell spray foam also adds structural strength. The payback period is typically 3–5 years through energy savings.
Most insulation projects take 1 to 2 days. Attic blown-in jobs can be completed in a single day while whole-house retrofits may take 2–3 days. Spray foam projects require the home to be vacated for 24 hours after application for proper curing and offgassing.
Yes. Proper insulation can increase home value by 2–6% and is a strong selling point as buyers factor in energy efficiency and utility costs. Updated attic insulation is one of the highest ROI home improvement projects, often returning 100%+ of cost at resale.