How Much Does Attic Insulation Cost?
$1 – $4 / sq ft
National average: $1,700–$2,500 per attic
Interactive worksheet
Attic insulation cost calculator
Set the scope, size, and state — the tally updates as you go. Built from this guide's figures and BLS state wage data.
01 Quality & scope
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State figures apply BLS construction wages (2025) at a 60% labor weight — how we estimate.
Your estimate
- Labor ≈60%
- $600
- Materials & equipment
- $400
- Planning range
- $900 – $1,100
low $1.00/sq ft $4.00/sq ft high
U.S. construction trades average $65,360/yr (BLS 2025).
Get three written bids. One far under $800 usually means missing scope — ask what's not included. Far over $1,200, ask what's driving the number.
More Insulation & Weatherproofing: Spray Foam Insulation ·Blown In Insulation ·Basement Waterproofing ·Window Replacement
Attic insulation is the highest-impact, best-value energy upgrade in most homes — heat rises, and an under-insulated attic bleeds money year-round. It costs $1 to $4 per square foot installed in 2026, or roughly $1,700–$2,500 for a typical attic.
What you’re paying for
The bulk is the insulation material and labor, but two add-ons matter: air sealing (closing the gaps and penetrations that let conditioned air escape) and removing old insulation if it’s damaged, moldy, or pest-soiled. Skipping air sealing is the most common way attic insulation underperforms.
Cost by type
The material sets the price. The table below shows typical installed pricing per square foot.
How much R-value do you need?
Insulation is rated by R-value (resistance to heat flow), and attics need a lot — the Department of Energy recommends roughly R-49 to R-60 across most of the country. More R-value means more inches (and more cost), but attics are where it pays off fastest. If your existing insulation is below the joists, you’re under-insulated.
Air-seal first
The single best money you’ll spend is air sealing before insulating. Insulation slows heat flow but doesn’t stop air leakage; sealing the top plates, can-light penetrations, and the attic hatch first is what turns insulation into real savings. Many quotes bundle it — confirm it’s included.
How to save on attic insulation
- Choose blown-in for the best coverage-per-dollar on an attic floor.
- Air-seal first so the insulation actually performs.
- Check utility rebates — insulation is a commonly subsidized upgrade.
- DIY blown-in with a rental blower if you’re comfortable in the attic.
| Component | Typical range | Notes |
|---|---|---|
| Insulation material + install | $0.80 – $5 / sq ft | – |
| Air sealing | $250 – $750 | – |
| Old insulation removal | $1 – $1.50 / sq ft | – |
| Baffles / attic prep | $100 – $500 | – |
| Option | Typical range | Notes |
|---|---|---|
| Batt / rolled (fiberglass) | $0.80 – $2.60 / sq ft | – |
| Blown-in (cellulose / fiberglass) | $0.90 – $2.40 / sq ft | Best for attic floors |
| Spray foam (open / closed cell) | $1.50 – $5.00 / sq ft | Air-seals and insulates |
What affects the price
- Insulation type & R-value Higher R-value (more inches) costs more; your climate sets the target (often R-49–R-60 for attics).
- Attic size Priced per square foot, so larger attics cost more in total.
- Air sealing Sealing gaps and penetrations before insulating is what makes it actually perform — a worthwhile add-on.
- Old insulation removal Removing damaged, moldy, or pest-contaminated insulation adds $1–$1.50 per square foot.
Attic insulation cost by state
Where you live moves the price as much as any option you pick, because labor is a big share of the bill and construction wages differ sharply by state. Adjusted with BLS wage data (2025), a typical attic insulation job runs about $1.15 – $4.70/sq ft in Hawaii (+17%) versus $0.85 – $3.40/sq ft in Arkansas (−15%).
See the typical range in all 50 states + D.C.
| State | Typical range |
|---|---|
| Alabama | $0.85 – $3.50/sq ft |
| Alaska | $1.15 – $4.60/sq ft |
| Arizona | $0.95 – $3.80/sq ft |
| Arkansas | $0.85 – $3.40/sq ft |
| California | $1.10 – $4.50/sq ft |
| Colorado | $1 – $4/sq ft |
| Connecticut | $1.05 – $4.30/sq ft |
| Delaware | $1 – $3.90/sq ft |
| District of Columbia | $1.10 – $4.30/sq ft |
| Florida | $0.90 – $3.65/sq ft |
| Georgia | $0.90 – $3.70/sq ft |
| Hawaii | $1.15 – $4.70/sq ft |
| Idaho | $0.95 – $3.75/sq ft |
| Illinois | $1.15 – $4.60/sq ft |
| Indiana | $1 – $4.05/sq ft |
| Iowa | $0.95 – $3.90/sq ft |
| Kansas | $0.95 – $3.80/sq ft |
| Kentucky | $0.95 – $3.70/sq ft |
| Louisiana | $0.90 – $3.60/sq ft |
| Maine | $1 – $3.90/sq ft |
| Maryland | $1 – $4/sq ft |
| Massachusetts | $1.15 – $4.60/sq ft |
| Michigan | $1 – $4/sq ft |
| Minnesota | $1.10 – $4.35/sq ft |
| Mississippi | $0.85 – $3.50/sq ft |
| Missouri | $1 – $4.10/sq ft |
| Montana | $1 – $3.90/sq ft |
| Nebraska | $0.95 – $3.75/sq ft |
| Nevada | $1.05 – $4.10/sq ft |
| New Hampshire | $1 – $3.95/sq ft |
| New Jersey | $1.15 – $4.55/sq ft |
| New Mexico | $0.90 – $3.70/sq ft |
| New York | $1.10 – $4.40/sq ft |
| North Carolina | $0.90 – $3.60/sq ft |
| North Dakota | $1 – $4.05/sq ft |
| Ohio | $1 – $4/sq ft |
| Oklahoma | $0.90 – $3.65/sq ft |
| Oregon | $1.10 – $4.40/sq ft |
| Pennsylvania | $1 – $4.05/sq ft |
| Rhode Island | $1.05 – $4.15/sq ft |
| South Carolina | $0.90 – $3.65/sq ft |
| South Dakota | $0.90 – $3.60/sq ft |
| Tennessee | $0.90 – $3.70/sq ft |
| Texas | $0.90 – $3.65/sq ft |
| Utah | $0.95 – $3.75/sq ft |
| Vermont | $0.95 – $3.90/sq ft |
| Virginia | $0.95 – $3.80/sq ft |
| Washington | $1.15 – $4.65/sq ft |
| West Virginia | $0.95 – $3.80/sq ft |
| Wisconsin | $1.05 – $4.15/sq ft |
| Wyoming | $1 – $3.95/sq ft |
Estimates apply each state's BLS construction-wage multiplier to this guide's national range, a planning number, not a quote. Browse the full state cost guides or our methodology.
Frequently asked questions
- How much does it cost to insulate an attic?
- Most attics run $1–$4 per square foot installed, or about $1,700–$2,500 total. Blown-in and batt are cheapest; spray foam costs the most.
- What R-value do I need for my attic?
- It depends on climate — the U.S. Department of Energy recommends roughly R-49 to R-60 for attics in most of the country. Your installer sizes the depth to hit the target.
- Batt vs. blown-in vs. spray foam — which is best?
- Blown-in is fast and great for covering attic floors evenly; batt is cheap for accessible joist bays; spray foam costs more but air-seals and insulates in one step, ideal for sealing a roofline.
- Does attic insulation pay for itself?
- Often yes — it's one of the highest-ROI energy upgrades, typically paying back in a few years through lower heating and cooling bills, and improving comfort immediately.
- Are there rebates for attic insulation?
- Many utilities offer insulation rebates, and some state programs help with weatherization. Federal energy-efficiency credits for insulation have tightened — check current local programs.
- Should I air-seal before insulating?
- Yes. Air sealing gaps, top plates, and fixture penetrations first prevents insulation from being undermined by air leakage — it's the step that makes the insulation work.
How we estimate: ranges reflect typical U.S. pricing for materials and professional installation, compiled and cross-checked against the current (2026) industry sources listed below (see our data & methodology). Your actual cost depends on your location, project size, material grade, and local labor rates — always get multiple written quotes before you commit.
Sources
Cost ranges on this page were checked against current (2026) data from these industry sources:
- How Much Does Attic Insulation Cost? (2026) — HomeGuide
- How Much Does Attic Insulation Cost? (2026 Data) — Angi
- Cost to Insulate Attic (2026) — Homewyse