How Much Does Attic Insulation Cost in 2026?
By Michael JohnsonUpdated 11 sources comparedHow we estimate
Most homeowners pay $1,000 to $3,000 to insulate an attic, or roughly $1 to $4 per square foot, with an average of about $1,950. That average is the midpoint of the national figures from HomeGuide ($1,800) and Angi ($2,100), and it lines up with The Home Depot's $1.80 per sq ft average on a 1,000 sq ft attic. The biggest price drivers are the material, the attic's size, the R-value you're aiming for, and whether old insulation must come out first.
- Typical cost
- $1,000–$3,000
- National average
- $1,950
- Full range
- $500–$9,000
The typical range covers adding blown-in fiberglass or cellulose, or fiberglass batts, over the floor of a roughly 1,000 sq ft attic to current R-value targets; removing old insulation, air sealing and spray foam at the roof deck push the total toward the national high. Prices are per attic (about 1,000 sq ft of attic floor).
Attic insulation cost by material
The table compiles installed prices per square foot of attic floor (or roof deck, for spray foam) from four independent sources. The QuoteRuler range is where they overlap for a typical project.
| Insulation type | Installed cost per sq ft in sources | QuoteRuler range per sq ft | About 1,000 sq ft |
|---|---|---|---|
| Blown-in fiberglass | $0.90–$2.80 (HomeGuide); $1–$4 blown-in (Angi) | $1.00–$2.40 | $1,000–$2,400 |
| Blown-in cellulose | $1.20–$2.80 (HomeGuide); $1–$2.50 (Modernize) | $1.20–$2.80 | $1,200–$2,800 |
| Fiberglass batts or rolls | $0.80–$2.60 (HomeGuide); $0.50–$2 (Modernize); $2–$4 (Angi) | $0.80–$2.60 | $800–$2,600 |
| Blown-in mineral wool | $1.90–$4.20 (HomeGuide) | $1.90–$4.20 | $1,900–$4,200 |
| Spray foam (all types) | $1.00–$4.50 (HomeGuide); $2–$5 (Angi); $2–$7 (Modernize) | $2.00–$7.00 | $2,000–$7,000 |
| Radiant barrier | $0.50–$2.20 (HomeGuide); $0.50–$2 (Angi) | $0.50–$2.00 | $500–$2,000 |
Sources disagree mainly because of what's included. Angi's per-sq-ft rates are higher than its own whole-project figures ($1,000–$3,000 for 1,000 sq ft), which suggests the rate tables include more prep work. The Home Depot's narrower $1.50–$2.45 range reflects its installed attic program. HomeGuide notes some companies set minimum charges of $1,500 to $2,000, which raises the price of small attics.
Estimate your cost
Choose the insulation type, tick any prep work, and pick the approximate size of your attic floor.
Ranges come from the sources listed at the end of this guide. The labor portion is adjusted for your state with BEA price data. Your final price depends on site conditions and local codes.
Blown-in insulation by R-value
Blown-in (loose-fill) insulation is the most common choice for attic floors because it fills around joists, wires and pipes. HomeGuide prices blown-in fiberglass per 1,000 sq ft by target R-value:
| Target R-value | Bags per 1,000 sq ft | Installed cost per 1,000 sq ft |
|---|---|---|
| R-30 | 14–15 | $660–$1,200 |
| R-38 | 18–20 | $840–$1,500 |
| R-49 | 24–26 | $1,100–$1,900 |
| R-60 | 29–32 | $1,400–$2,400 |
Cellulose costs a little more per square foot ($1.20–$2.80), and mineral wool costs the most of the loose-fill options ($1.90–$4.20).
Spray foam: open-cell vs. closed-cell
Spray foam is usually applied to the underside of the roof deck, which turns the attic into a sealed, semi-conditioned space. HomeGuide prices open-cell foam at $0.60 to $1.30 per board foot (one square foot, one inch thick) and closed-cell at $1.30 to $2.90 per board foot. Closed-cell resists more heat per inch (R-5 to R-7, versus R-3.5 to R-3.7 for open-cell), but costs about twice as much per board foot. HomeGuide puts a full roof-deck application at $1,500 to $9,000.
In our calculator, open-cell sits at $2,000 to $5,000 per 1,000 sq ft, matching Angi's $2–$5 per sq ft, and closed-cell sits at $4,000 to $9,000, the top of the Modernize ($7 per sq ft) and HomeGuide ($9,000) ranges. A roof deck also has more surface area than the attic floor below it, so foam quotes run higher than floor-area math suggests.
Radiant barriers
A radiant barrier is a reflective sheet that blocks radiant heat from the roof. It is not a substitute for insulation.
R-value targets by climate zone
The right amount of insulation depends on where you live. The Department of Energy recommends these attic levels when adding insulation to an existing home:
| Climate zone | Typical areas | Uninsulated attic | Attic with 3–4 inches already |
|---|---|---|---|
| 1 | South Florida, Hawaii | R-30 to R-49 | R-19 to R-38 |
| 2–3 | Gulf Coast, Southwest, Southeast | R-49 to R-60 | R-38 to R-49 |
| 4–8 | Mid-Atlantic, Midwest, Northeast, Mountain West, Alaska | R-60 | R-49 |
ENERGY STAR's table uses the same zones and lists the lower end of these ranges (for example, R-49 for an uninsulated attic in zones 2 and 3). A quick check from ENERGY STAR: if your insulation is level with or below the tops of the floor joists, you probably need more. If you can't see any joists, adding more may not pay off.
Labor vs. materials
Insulation is a labor-heavy job. HomeGuide puts blown-in labor at $0.70 to $1.70 per sq ft against materials of $0.30 to $1.10 for fiberglass. Its R-49 example ($720–$1,000 of material in a $1,100–$1,900 job) puts labor at roughly 35% to 50%. Angi lists labor at $1.50 to $3 per sq ft, and contractors bill about $40 to $80 per hour (HomeGuide).
We use a labor share of 50% in our state adjustments. Spray foam shifts more of the cost to materials, while removal and air sealing are almost all labor.
What drives the price up or down
- Attic size. Costs scale with floor area: Angi puts 500 sq ft at $500–$1,500 and 1,500 sq ft at $1,500–$4,500.
- Target R-value. Going from R-38 to R-60 adds roughly $560 to $900 per 1,000 sq ft for blown-in fiberglass (HomeGuide).
- Removal of old insulation. $1 to $2 per sq ft (HomeGuide; Angi $1–$1.50), so about $1,000 to $2,000 for a 1,000 sq ft attic.
- Air sealing. $250 to $750 (Angi), and up to $3,000 for leaky attics with many duct and fixture penetrations (HomeGuide).
- Access and clearance. Low-slope roofs, small hatches and tight eaves slow the crew down.
- Minimum charges. Some companies won't take jobs under $1,500 to $2,000 (HomeGuide).
Seal air leaks first
ENERGY STAR's attic guide assumes the attic is air sealed before new insulation goes in. Insulation slows heat flow, but it doesn't stop air from leaking through gaps around plumbing stacks, wiring holes, chimneys, recessed lights and the attic hatch. Once a thick layer of insulation covers those gaps, they are hard to reach. Air sealing costs $250 to $750 in most attics (Angi), and it's the cheapest part of the job to do right.
Ducts in the attic matter too. If your air handler or ductwork sits up there, sealing and insulating ducts can matter as much as the insulation itself; our HVAC replacement cost guide covers that equipment if it's near the end of its life.
Attic insulation cost by state
Insulation labor rates vary by region, and so do the climate-zone targets that set how much material you need. The table below starts from our national range, compiled from the sources above, and adjusts only the labor portion (50%) using the Bureau of Economic Analysis Regional Price Parities for each state.
| State | Typical range | Average | vs. U.S. |
|---|---|---|---|
| Alabama | $950–$2,850 | $1,850 | -5.0% |
| Alaska | $1,000–$3,050 | $1,950 | +0.9% |
| Arizona | $1,000–$3,000 | $1,950 | +0.6% |
| Arkansas | $930–$2,800 | $1,800 | -6.8% |
| California | $1,050–$3,200 | $2,050 | +6.3% |
| Colorado | $1,000–$3,000 | $1,950 | +0.7% |
| Connecticut | $1,000–$3,050 | $2,000 | +1.8% |
| Delaware | $1,000–$3,000 | $1,950 | -0.4% |
| District of Columbia | $1,050–$3,150 | $2,050 | +5.4% |
| Florida | $1,000–$3,050 | $2,000 | +1.8% |
| Georgia | $980–$2,950 | $1,900 | -1.6% |
| Hawaii | $1,050–$3,150 | $2,050 | +4.3% |
| Idaho | $960–$2,850 | $1,850 | -4.3% |
| Illinois | $990–$3,000 | $1,950 | -0.5% |
| Indiana | $960–$2,900 | $1,850 | -3.9% |
| Iowa | $940–$2,850 | $1,850 | -5.6% |
| Kansas | $950–$2,850 | $1,850 | -5.0% |
| Kentucky | $950–$2,850 | $1,850 | -4.7% |
| Louisiana | $940–$2,800 | $1,850 | -5.8% |
| Maine | $990–$2,950 | $1,900 | -1.4% |
| Maryland | $1,000–$3,050 | $2,000 | +2.0% |
| Massachusetts | $1,050–$3,100 | $2,050 | +4.1% |
| Michigan | $970–$2,900 | $1,900 | -2.9% |
| Minnesota | $990–$3,000 | $1,950 | -0.8% |
| Mississippi | $940–$2,800 | $1,850 | -6.3% |
| Missouri | $960–$2,900 | $1,850 | -4.1% |
| Montana | $950–$2,850 | $1,850 | -4.9% |
| Nebraska | $950–$2,850 | $1,850 | -4.8% |
| Nevada | $980–$2,950 | $1,900 | -1.5% |
| New Hampshire | $1,050–$3,100 | $2,000 | +2.6% |
| New Jersey | $1,050–$3,150 | $2,050 | +4.4% |
| New Mexico | $950–$2,850 | $1,850 | -4.8% |
| New York | $1,050–$3,100 | $2,000 | +3.8% |
| North Carolina | $970–$2,900 | $1,900 | -3.0% |
| North Dakota | $940–$2,850 | $1,850 | -5.7% |
| Ohio | $960–$2,900 | $1,850 | -4.1% |
| Oklahoma | $940–$2,800 | $1,850 | -5.8% |
| Oregon | $1,000–$3,050 | $2,000 | +2.3% |
| Pennsylvania | $990–$2,950 | $1,950 | -1.2% |
| Rhode Island | $1,000–$3,000 | $1,950 | +0.7% |
| South Carolina | $970–$2,900 | $1,900 | -3.4% |
| South Dakota | $940–$2,800 | $1,850 | -6.0% |
| Tennessee | $960–$2,900 | $1,900 | -3.7% |
| Texas | $990–$2,950 | $1,900 | -1.4% |
| Utah | $980–$2,900 | $1,900 | -2.5% |
| Vermont | $980–$2,950 | $1,900 | -1.7% |
| Virginia | $1,000–$3,000 | $1,950 | +0.4% |
| Washington | $1,050–$3,150 | $2,050 | +4.3% |
| West Virginia | $950–$2,850 | $1,850 | -5.1% |
| Wisconsin | $970–$2,900 | $1,900 | -3.4% |
| Wyoming | $950–$2,850 | $1,850 | -4.6% |
Use these figures as a starting point. Utility rebate programs can lower the net price a lot in some states and not at all in others.
DIY vs. hiring a pro
DIY blown-in insulation is one of the more approachable home energy projects. HomeGuide estimates DIY costs of $0.35 to $1.50 per sq ft, or $500 to $1,200 on average. A blowing machine rents for $100 to $200 a day, and some home improvement stores lend one free when you buy 10 to 20 or more bags. Bags cost about $30 to $40 each, and an R-49 attic needs roughly 24 to 26 bags per 1,000 sq ft. Plan on two people: one feeding the machine, one in the attic.
DIY makes sense when the attic floor is easy to walk, the existing insulation is dry and clean, and you only need to top it up. Hire a pro when you need removal, extensive air sealing, spray foam (which needs specialized equipment and protective gear), or work around old wiring.
Safety notes:
- Vermiculite: if your attic has pebble-like, gray-brown or silver-gold loose fill, it may be vermiculite, much of which came from a Libby, Montana mine whose ore contained asbestos. The EPA says to leave it undisturbed and hire a professional asbestos contractor before any work. Do not remove it yourself.
- Knob-and-tube wiring and damaged wiring should be checked by a licensed electrician before insulation covers them.
- Keep insulation clear of chimneys, flues and recessed lights that aren't rated for insulation contact, and don't block soffit vents.
How to save money on attic insulation
- Know the tax credit is gone. The federal Energy Efficient Home Improvement Credit (25C) covered 30% of insulation and air-sealing materials, up to $1,200 a year. The IRS says it applies only to improvements made through December 31, 2025. Don't count on it for a 2026 project.
- Look for utility rebates. Many utilities and state programs still pay for insulation and air sealing. Search your ZIP code in the ENERGY STAR Rebate Finder, and check whether pre-approval or an energy audit is required before work starts.
- Top up instead of tearing out when the existing insulation is dry and clean. ENERGY STAR says new loose fill can go over old batts, and unfaced batts can go over loose fill.
- Insulate to your zone's target, not beyond it. Each extra inch has a smaller payoff.
- Plan ahead of the cold season. Insulation contractors tend to be busiest when heating bills arrive, so booking in spring or early fall usually gives you more scheduling room and time to compare quotes.
- Get at least three quotes that name the same material and target R-value.
ENERGY STAR estimates that sealing and insulating can save up to 10% on annual energy bills. Savings are largest in attics that are badly under-insulated today.
How to compare insulation quotes
A fair quote should list:
- Material, target R-value and installed depth in inches, plus the number of bags for blown-in jobs.
- Square footage being insulated.
- Air sealing scope: which penetrations, top plates and hatch will be sealed.
- Baffles at the eaves, dams around the hatch and chimney, and covers for recessed lights.
- Removal and disposal of old insulation, if included.
- An attic depth ruler or certificate showing the installed R-value.
Red flags: a price per bag with no R-value stated; no mention of air sealing; promises of a federal tax credit for 2026 work; energy savings claims far above ENERGY STAR's "up to 10%"; or pressure to buy spray foam without discussing ventilation and moisture.
Hidden costs people forget
- Attic cleaning and prep for debris or pest droppings: $100 to $300 (HomeAdvisor).
- Removal of wet, moldy or rodent-damaged insulation: $1 to $2 per sq ft.
- Vermiculite abatement by an asbestos contractor, priced separately.
- Ventilation fixes such as baffles or added vents, so new insulation doesn't block airflow.
- Electrical repairs found during the job.
- Floors over crawl spaces that leak just as much heat; our crawl space encapsulation cost guide covers sealing that part of the house.
Bottom line
Insulating a typical 1,000 sq ft attic with blown-in fiberglass, cellulose or batts usually costs $1,000 to $3,000, and about $1,950 is a realistic national midpoint. Removal, air sealing and spray foam at the roof deck can push a job to $4,000 to $9,000. Air seal first, insulate to your climate zone's R-value, and check the ENERGY STAR Rebate Finder, since the 25C tax credit ended after 2025. Get three quotes that state the same material and R-value.
Frequently asked questions
How much does it cost to insulate a 1,000 sq ft attic?
Most 1,000 sq ft attics cost about $1,000 to $3,000 to insulate with blown-in or batt insulation (Angi $1,000–$3,000; HomeGuide $900–$2,400 for blown-in). Blowing fiberglass to R-49 runs about $1,100 to $1,900 per 1,000 sq ft according to HomeGuide. Spray foam at the roof deck costs several times more.
How thick should attic insulation be?
It depends on your climate zone and the material. The Department of Energy recommends R-30 to R-49 in the warmest zone and R-49 to R-60 in most of the country for an uninsulated attic. HomeGuide lists R-60 blown-in fiberglass at a minimum of about 20 inches, while ENERGY STAR describes R-38 as roughly 10 to 14 inches depending on the type.
How much does cellulose insulation cost?
Blown-in cellulose costs about $1.20 to $2.80 per sq ft installed (HomeGuide), and Modernize lists $1 to $2.50. For a 1,000 sq ft attic, that's roughly $1,200 to $2,800. It usually costs a little more than blown-in fiberglass.
Is insulating my attic worth it?
Usually, if your current insulation is at or below the top of the floor joists. ENERGY STAR says sealing and insulating can save up to 10% on annual energy bills, with the best payback in attics that are under-insulated today. If you can't see any joists, ENERGY STAR notes that adding more may not be cost-effective.
Can I blow in attic insulation myself?
Yes, many homeowners do. HomeGuide puts DIY blown-in insulation at $0.35 to $1.50 per sq ft, or $500 to $1,200 on average, with blower rental at $100 to $200 a day, though some stores lend the machine free when you buy 10 to 20 or more bags. It takes two people, and you should air seal first and keep insulation clear of recessed lights and flues.
Is there a tax credit for attic insulation in 2026?
No. The IRS says the Energy Efficient Home Improvement Credit (Section 25C), which covered 30% of insulation and air-sealing material costs up to $1,200 a year, applies only to improvements placed in service through December 31, 2025. Utility rebates may still be available; search your ZIP code in the ENERGY STAR Rebate Finder.
Should old attic insulation be removed before adding new?
Not usually. ENERGY STAR notes you can add new insulation over existing material, as long as fiberglass added over loose fill is unfaced. Removal, at about $1 to $2 per sq ft (HomeGuide, Angi), makes sense when the old insulation is wet, moldy, contaminated by pests or smoke, or when you need to air seal underneath. Vermiculite should be left to an asbestos professional.
Sources
We compared these sources to build the QuoteRuler range. State figures adjust the labor portion (50% of the total) using the BEA Regional Price Parities.
- How Much Does Attic Insulation Cost? — HomeGuide. Used for: Average $1,800; typical $1,000–$2,700; $1–$4 per sq ft; min $500, max $6,000; minimum project charges $1,500–$2,000 at some companies; by size 500 sq ft $500–$2,000, 1,000 sq ft $1,000–$4,000, 1,500 sq ft $1,500–$6,000, 2,000 sq ft $2,000–$8,000; blown-in $0.90–$2.40/sq ft; batt and roll $0.80–$2.60; spray foam $1.00–$4.50; reflective $0.50–$2.20; labor $0.50–$1.30/sq ft; removal $1–$2/sq ft; replacement including removal $2–$6/sq ft; air sealing $350–$3,000; DIY 5 inches of loose fill $200–$650 per 1,000 sq ft. Title references 2026; page shows no exact update date..
- How Much Does Blown-In Insulation Cost? — HomeGuide. Used for: Search listing dated November 5, 2025. Blown-in fiberglass $1.00–$2.80/sq ft (materials $0.30–$1.10); cellulose $1.20–$2.80 (materials $0.30–$1.80); mineral wool $1.90–$4.20; attic floor 1,000 sq ft $900–$2,400, 1,500 sq ft $1,350–$3,600; per 1,000 sq ft by R-value: R-30 $660–$1,200, R-38 $840–$1,500, R-49 $1,100–$1,900 (24–26 bags), R-60 $1,400–$2,400 (20-inch minimum); labor $0.70–$1.70/sq ft, $40–$80/hr; removal $1–$2/sq ft; DIY $0.35–$1.50/sq ft or $500–$1,200; blower rental $100–$200/day, free at some stores with 10–20+ bags; 30-lb bag $30–$40..
- How Much Does Spray Foam Insulation Cost? — HomeGuide. Used for: Open-cell $0.60–$1.30 per board foot installed; closed-cell $1.30–$2.90 per board foot; attic floor $1,100–$6,800; attic rafters/roof deck $1,500–$9,000; R-value per inch: open-cell 3.5–3.7, closed-cell 5–7. Page shows no update date..
- How Much Does It Cost to Insulate an Attic? — Angi / HomeAdvisor (Angi Inc.). Used for: Title references 2025 data; HomeAdvisor's page (https://www.homeadvisor.com/cost/heating-and-cooling/attic-insulation/) shows the same dataset, so counted as one source. Average $2,100; range $1,700–$2,500; $1–$3 per sq ft; by size 500 sq ft $500–$1,500, 1,000 sq ft $1,000–$3,000, 1,500 sq ft $1,500–$4,500; batt $2–$4/sq ft; blown-in $1–$4; spray foam $2–$5; reflective $0.50–$2; labor $1.50–$3/sq ft; air sealing $250–$750; removal $1–$1.50/sq ft; attic cleaning and prep $100–$300 (HomeAdvisor)..
- Cost to Install Attic Insulation — The Home Depot. Used for: Installed attic insulation $1.50–$2.45 per sq ft, average $1.80 per sq ft. No page date shown..
- How Much Does Attic Insulation Cost in 2026? — Modernize. Used for: Updated October 29, 2026. Professional installation $1,500–$4,500 (banner $1,500–$4,000); 1,500 sq ft attic $1–$3/sq ft; fiberglass or blown-in cellulose about $1.75/sq ft on average; fiberglass batts/rolls $0.50–$2; blown-in cellulose $1–$2.50; spray foam $2–$7; DIY materials $500–$1,500. Modernize's 10%–50% energy savings claim was not used..
- Energy Saver: Tips on Saving Money and Energy in Your Home (2022 guide) — U.S. Department of Energy (Energy Saver). Used for: DOE recommended total R-values for new or existing wood-framed houses: uninsulated attic Zone 1 R-30–R-49, Zones 2–3 R-49–R-60, Zones 4–8 R-60; attic with 3–4 inches existing: Zone 1 R-19–R-38, Zones 2–3 R-38–R-49, Zones 4–8 R-49..
- Recommended Home Insulation R-Values — ENERGY STAR (EPA). Used for: Attic R-value table by climate zone: uninsulated attic Zone 1 R30, Zones 2–3 R49, Zones 4–8 R60; existing 3–4 inches Zone 1 R25, Zones 2–3 R38, Zones 4–8 R49..
- Adding Attic Insulation (DIY guide) and Seal and Insulate — ENERGY STAR (EPA). Used for: Air seal before insulating; add insulation if it is level with or below the floor joists; if no joists are visible adding more may not be cost-effective; R-38 is roughly 10–14 inches; fiberglass added over loose fill must be unfaced; some stores rent blowing machines. Seal and Insulate page (https://www.energystar.gov/saveathome/seal_insulate): sealing and insulating can provide up to 10% savings on annual energy bills..
- Energy Efficient Home Improvement Credit — IRS. Used for: Section 25C: 30% of qualified expenses; insulation and air sealing limited only by the $1,200 annual cap; labor not eligible; materials must meet IECC standards; credit applies to improvements made through December 31, 2025, and not to property placed in service after that date..
- Protect Your Family from Asbestos-Contaminated Vermiculite Insulation — U.S. Environmental Protection Agency. Used for: Libby, Montana mine supplied over 70% of U.S. vermiculite from 1919 to 1990 and its ore contained asbestos; treat vermiculite as contaminated, leave it undisturbed, don't remove it yourself, hire a professional asbestos contractor before any work that could disturb it..
- Regional Price Parities by State, 2023 — U.S. Bureau of Economic Analysis. Used for: state cost adjustments.