Key takeaways
- National range: $1,700–$2,500 per attic, about $2,100 on average.
- Cheapest states: Arkansas, Mississippi and Alabama. Most expensive: Hawaii, California and Alaska.
- Biggest price driver: Insulation type and target R-value.
- Best way to save: Air-seal before adding insulation.
How much does attic insulation cost in 2026?
| Type / item | Typical cost (per sq ft installed) | Notes |
|---|---|---|
| Blown-in (fiberglass or cellulose) | $1–$4 | Fills gaps well |
| Batts or rolls | $2–$4 | DIY-friendly |
| Loose-fill | $2–$5 | |
| Spray foam | $2–$5 | Also air-seals |
| Radiant barrier | $0.50–$2 | Best in hot climates |
| Structural insulated panels | $4–$7 | |
| Old insulation removal | $1–$1.50 | If wet, moldy or pest-damaged |
| Air sealing | $250–$750 per project | Often done first |
| 1,000 sq ft attic | $1,000–$3,000 total |
How we calculate costs
National ranges come from published cost surveys (cited below). Local estimates apply an approximate state cost index. Read our methodology.
Attic Insulation Cost questions, answered
- What is the cost of blown-in (fiberglass or cellulose)? The typical cost of blown-in (fiberglass or cellulose) is $1–$4 (typical cost per sq ft installed). Fills gaps well.
- What is the cost of batts or rolls? The typical cost of batts or rolls is $2–$4 (typical cost per sq ft installed). DIY-friendly.
- What is the cost of loose-fill? The typical cost of loose-fill is $2–$5 (typical cost per sq ft installed).
- What is the cost of spray foam? The typical cost of spray foam is $2–$5 (typical cost per sq ft installed). Also air-seals.
- What is the cost of radiant barrier? The typical cost of radiant barrier is $0.50–$2 (typical cost per sq ft installed). Best in hot climates.
- What is the cost of structural insulated panels? The typical cost of structural insulated panels is $4–$7 (typical cost per sq ft installed).
- What is the cost of old insulation removal? The typical cost of old insulation removal is $1–$1.50 (typical cost per sq ft installed). If wet, moldy or pest-damaged.
- What is the cost of air sealing? The typical cost of air sealing is $250–$750 per project (typical cost per sq ft installed). Often done first.
- What is the cost of 1,000 sq ft attic? The typical cost of 1,000 sq ft attic is $1,000–$3,000 total (typical cost per sq ft installed).
What changes the price
- Insulation type and target R-value.
- Attic size and access.
- Removal of old or damaged insulation.
- Air sealing and ventilation work.
- Climate zone requirements.
How to save without cutting corners
- Air-seal before adding insulation.
- Top up existing insulation instead of removing it if it's dry and clean.
- Check utility and state rebates for insulation.
- Combine insulation with roof or HVAC work.
Attic Insulation Cost by state
Labor and material prices vary by region. These estimates apply each state's approximate cost index to the national range.
| State | Estimated range | vs. U.S. average |
|---|---|---|
| Alabama | $1,500–$2,200 | 14% below |
| Alaska | $2,100–$3,100 | 22% above |
| Arizona | $1,600–$2,300 | 7% below |
| Arkansas | $1,400–$2,100 | 15% below |
| California | $2,100–$3,100 | 22% above |
| Colorado | $1,700–$2,500 | about average |
| Connecticut | $1,900–$2,800 | 12% above |
| Delaware | $1,800–$2,600 | 4% above |
| District of Columbia | $1,900–$2,800 | 10% above |
| Florida | $1,600–$2,300 | 8% below |
| Georgia | $1,500–$2,200 | 11% below |
| Hawaii | $2,200–$3,300 | 30% above |
| Idaho | $1,600–$2,300 | 8% below |
| Illinois | $1,900–$2,800 | 10% above |
| Indiana | $1,600–$2,400 | 6% below |
| Iowa | $1,600–$2,300 | 7% below |
| Kansas | $1,500–$2,300 | 10% below |
| Kentucky | $1,500–$2,300 | 10% below |
| Louisiana | $1,500–$2,200 | 13% below |
| Maine | $1,600–$2,400 | 5% below |
| Maryland | $1,700–$2,500 | about average |
| Massachusetts | $2,000–$3,000 | 18% above |
| Michigan | $1,700–$2,500 | 2% below |
| Minnesota | $1,800–$2,700 | 6% above |
| Mississippi | $1,400–$2,100 | 15% below |
| Missouri | $1,600–$2,400 | 3% below |
| Montana | $1,600–$2,300 | 7% below |
| Nebraska | $1,500–$2,300 | 10% below |
| Nevada | $1,800–$2,600 | 3% above |
| New Hampshire | $1,700–$2,500 | about average |
| New Jersey | $2,000–$2,900 | 17% above |
| New Mexico | $1,500–$2,200 | 11% below |
| New York | $2,000–$3,000 | 20% above |
| North Carolina | $1,500–$2,200 | 13% below |
| North Dakota | $1,600–$2,300 | 8% below |
| Ohio | $1,600–$2,400 | 5% below |
| Oklahoma | $1,500–$2,200 | 13% below |
| Oregon | $1,800–$2,600 | 5% above |
| Pennsylvania | $1,800–$2,600 | 4% above |
| Rhode Island | $1,900–$2,800 | 10% above |
| South Carolina | $1,500–$2,200 | 13% below |
| South Dakota | $1,500–$2,200 | 12% below |
| Tennessee | $1,500–$2,200 | 11% below |
| Texas | $1,500–$2,200 | 11% below |
| Utah | $1,600–$2,300 | 7% below |
| Vermont | $1,600–$2,400 | 4% below |
| Virginia | $1,600–$2,400 | 6% below |
| Washington | $1,800–$2,700 | 8% above |
| West Virginia | $1,600–$2,300 | 7% below |
| Wisconsin | $1,700–$2,500 | about average |
| Wyoming | $1,500–$2,300 | 9% below |
Attic Insulation Cost FAQs
How much does it cost to insulate a 1,000 sq ft attic?
About $1,000–$3,000.
Should old insulation be removed?
Only if it's wet, moldy or pest-damaged; removal adds $1–$1.50 per sq ft.
More questions? See the attic insulation guide.
Attic Insulation Cost in popular cities
New York City, NYLos Angeles, CAChicago, ILHouston, TXPhiladelphia, PAPhoenix, AZSan Antonio, TXSan Diego, CADallas, TXSan Jose, CAAustin, TXJacksonville, FLSan Francisco, CAColumbus, OHFort Worth, TXIndianapolis, INCharlotte, NCSeattle, WADenver, CODetroit, MIBoston, MAMemphis, TNPortland, OROklahoma City, OKLas Vegas, NVBaltimore, MDWashington, D.C., DCMilwaukee, WINashville, TNFresno, CASacramento, CAKansas City, MOAtlanta, GAVirginia Beach, VARaleigh, NCMiami, FL
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Sources: HomeAdvisor — Attic insulation cost · Bob Vila — Attic insulation cost · ENERGY STAR — Recommended home insulation R-values. Ranges are rounded estimates; see our editorial policy.