Attic insulation costs a national average of $1,800 to $2,500 depending on the source, with most homeowners paying $1,000 to $2,700 installed. 1,2,3 Prices run $1 to $4 per square foot installed2, and a full removal-plus-reinsulation project lands near $3,000. 1 Prices below are national averages* for 2026.
*National averages, not local quotes. Your price depends on attic size, insulation type, target R-value for your climate zone, and local labor rates.
$1,800 – $2,500
national average, by source
$1 – $4
per sq ft installed, HomeGuide
$1 – $1.50
old insulation removal per sq ft, Angi
10% – 50%
potential energy savings, DOE via Fixr
Quick math: insulation prices by the square foot. At HomeGuide’s $1 – $4 per sq ft installed, a 1,000 sq ft attic runs $1,000 – $4,000, matching their size table exactly2. Reinsulating the same attic adds removal at $1 – $1.50 per sq ft, so a $2,100 average job plus $1,000 – $1,500 of removal totals $3,100 – $3,600 (our math from source rates)1.
Cost by insulation type
Three references, all fetched and read October 2026:
| Insulation type | Cost |
|---|---|
| Batt and roll | $0.80 – $2.60 per sq ft; $1,100 – $3,900 installed 2 (Fixr: $500 – $1,500 3) |
| Blown-in | $0.90 – $2.40 per sq ft; $900 – $3,600 installed 2 (Fixr: $1,750 – $5,500 3) |
| Loose-fill | $1.00 – $2.50 per sq ft; $1,100 – $3,800 installed 2 |
| Spray foam | $1.00 – $4.50 per sq ft; $1,100 – $9,000 installed 2 (Fixr: $2,500 – $12,000 3) |
| Reflective / radiant barrier | $0.50 – $2.20 per sq ft; $550 – $3,300 installed 2 |
| Rigid foam board | $2 – $5 per sq ft 1; $4,000 – $15,500 installed 3 |
| Structural insulated panels (SIPs) | $4 – $7 per sq ft 1 (material $4 – $12 2) |
Batt pricing disagrees most: Fixr quotes $500 – $1,500 installed while HomeGuide quotes $1,100 – $3,900 for a 1,100 – 1,500 sq ft attic – more than a 2x spread, partly because some installers carry $1,500 – $2,000 project minimums. 2,3
Cost by attic size
Angi’s size table runs lower than both ($1,000 – $3,000 for 1,000 sq ft1), and its own FAQ contradicts its headline numbers: the body quotes a $2,100 average while the FAQ says $2,500. We flag it rather than pick one. 1
Add-on costs
Material-only costs
Material-only prices matter if you DIY: fiberglass is the cheapest and easiest to handle; rockwool contains silica dust and should be installed by professionals. 3
What drives the price
R-value target. Your climate zone sets the R-value you need; colder climates require more material, more layers, and higher cost. 1
Insulation type. Blown-in and batt are the budget options; spray foam and rigid board cost more but seal and insulate better. 1,2
Existing insulation. Good-condition insulation can stay; damaged material must be removed at $1 – $1.50 per sq ft. 1
Access and complexity. Obstructions, irregular joist spacing, and ventilation fixes raise labor time. 2
Worked examples
Example 1: 1,000 sq ft attic. At $1 – $4 per sq ft installed, a 1,000 sq ft attic costs $1,000 – $4,000, matching HomeGuide’s size table. 2
Example 2: removal plus reinsulation, 1,000 sq ft (our math from source rates). A $2,100 average install plus $1,000 – $1,500 of removal totals $3,100 – $3,600, consistent with Angi’s ~$3,000 full-project figure. 1
Example 3: DIY batt materials, 1,000 – 1,500 sq ft attic. Fiberglass material alone runs $300 – $1,000; professional installation of the same attic runs $1,000 – $3,000 in labor. 1,3
DIY shopping: fiberglass batt insulation at Home Depot (plain link, no affiliate relationship) – batts between standard joists are the DIY-friendly option; blown-in and spray foam are pro jobs.
Related guides
Crawl space encapsulation cost | Ice dam removal cost | Home inspection cost | Roof repair cost
HVAC Replacement Cost
Roof Replacement Cost
Ceiling Fan Installation Cost
Furnace Replacement Cost
Electrician Cost
Garage Door Installation Cost
FAQ
Is attic insulation worth it? Usually yes: the U.S. Department of Energy estimates a properly insulated home can save 10% to 50% on power bills, and insulation also helps prevent winter ice dams. 3
Can I DIY attic insulation? Fiberglass batts or rolls are the realistic DIY option; blown-in and spray foam need pro equipment and skill. Clearing the attic and air sealing small leaks yourself can cut labor charges. 1
How much does it cost to reinsulate an attic? Budget the new insulation plus removal: removal runs $1 – $1.50 per sq ft1, bringing a typical removal-plus-reinsulation project to around $3,000. 1
When is the cheapest time to book? April through June are the slowest months for insulation installers; October and November are the busiest. 1
Sources
- Angi – How Much Does Attic Insulation Cost? (2026)
- HomeGuide – How Much Does Attic Insulation Cost? (2026)
- Fixr – Attic Insulation Cost (2026)
Cost data on this page reflects national averages from the sources above. Get local quotes for your project.