How much does insulation cost?

Insulation is one of the few home upgrades that pays you back every month, but the price tag swings hard depending on what you buy and where it goes. A whole-house job runs $1,600–$8,000, or about $1–$7 per square foot installed. The same attic can cost $1,500 with blown-in fiberglass or $7,000 with closed-cell spray foam. Here is what each material and area costs in 2026, why the numbers swing so widely, and how to read a quote that lands at the high end.

What it costs to insulate a house

Across all materials, professional insulation runs $1–$7 per square foot installed. For a typical single-family home that lands the whole project between $1,600 and $8,000, and many contractors carry a $1,500–$2,000 minimum just to roll a crew and equipment to your address. Material is the single biggest lever (fiberglass batts are the cheapest thing you can buy and closed-cell spray foam is the most expensive), so the same square footage can quote two or three times apart.

On a normal job, labor accounts for roughly 40–60% of the total. Most crews bill $40–$80 per hour per worker and run two to three workers, so site conditions (tight crawl spaces, steep attics, finished walls that have to be drilled) move the labor line as much as the material does. The rest is material, and that's where your choice of product decides the bill:

• Material only: roughly $0.50–$2.80 per square foot depending on type.
• Labor only: roughly $0.20–$1.70 per square foot, more for spray foam and retrofits.
• Minimum project fee: $1,500–$2,000 is common; small one-room jobs often hit the minimum.

R-value is the other half of the equation. A higher target R-value means more inches of material (and more material), so an attic insulated to R-49 in a cold climate costs more than the same attic taken to R-30 in the South. Get the R-value target right for your climate zone before you compare quotes, because a cheap quote at the wrong R-value is not actually cheaper.

What moves your insulation quote

Two identical-looking homes two towns apart can quote very differently. The real drivers, in roughly the order they matter:

1. Material type. Fiberglass batts ($0.60–$1.20/sq ft) are cheapest; blown-in is mid; mineral wool and open-cell foam are higher; closed-cell spray foam ($3–$5/sq ft) is the most expensive. This is the first and biggest fork.
2. Area being insulated. An open attic is the cheapest place to work; finished walls that need drilling, and crawl spaces with poor access, cost more per square foot for the same product.
3. Target R-value. More R-value means more inches and more material. Cold-climate attics taken to R-49 to R-60 cost more than warm-climate attics at R-30 to R-38.
4. Square footage. Bigger areas spread the minimum and the mobilization cost across more square feet, so the per-foot price usually drops as the job grows.
5. Removal of old insulation. If wet, moldy, rodent-soiled, or settled insulation has to come out first, add $1–$2 per square foot before any new material goes in.
6. Region and metro market. The Northeast runs 15–20% above the national average and the West Coast 20–25% above; the South runs 10–15% below. Urban labor and demand drive the gap.
7. Air sealing and prep. Sealing penetrations, installing baffles, and fixture damming around can lights add labor but make the insulation actually perform.
8. Access and site conditions. Low attics, tight crawl spaces, and multi-story walls raise labor 10–30% over an easy single-story job.
9. Tax credits and rebates. The federal 25C credit for insulation expired at the end of 2025, but many state, local, and utility rebates remain; they don't change the contractor's price, but they change what you ultimately pay.

Price bands by type, line by line

Here is where the spread gets concrete. These are rough 2026 customer-facing ranges; the space and the target R-value set the real number.

Spray foam (the priciest, highest-performing)

• Open-cell spray foam: $1.50–$3.50 per square foot installed, about $0.40–$0.65 per board foot in raw material. R-3.5 per inch; good for interior walls and sound, and it expands to fill gaps.
• Closed-cell spray foam: $3.00–$5.00 per square foot installed, roughly $1–$2 per board foot in material. R-6 to R-7 per inch and acts as an air and moisture barrier, the reason it costs two to three times more than open-cell.
• Whole-house spray foam: $2,800–$6,500 for a typical single-family home, with most jobs around $3,500.

Blown-in / loose-fill (the attic workhorse)

• Blown-in fiberglass: $1.00–$1.70 per square foot installed.
• Blown-in cellulose: $1.10–$1.80 per square foot installed: denser, settles into a tighter thermal barrier, and offers a slightly higher R-value per inch (about R-3.1 to R-3.8).
• Blown-in attic, total: $900–$3,600 for a typical attic, depending on square footage and target R-value.

Batts and rolls (the budget choice)

• Fiberglass batts / rolls: $0.60–$1.20 per square foot installed: the cheapest professionally installed option, best for open stud and joist cavities.
• Mineral wool (Rockwool) batts: $1.50–$2.00 per square foot installed, about 40–50% more than fiberglass, with better fire resistance, sound control, and long-term performance.

By area of the home

• Attic (whole): $1,500–$6,000; a 1,000 sq ft attic to R-49 runs about $1,200–$3,500 with blown-in, or $3,000–$7,000 with spray foam on the roof deck.
• Walls, new construction: cheapest, because the cavities are open; batts or blown-in go in before drywall.
• Walls, retrofit (drill-and-fill / injection foam): $1.50–$4.50 per square foot; insulating all exterior walls of an existing home runs $4,300–$10,900, averaging about $6,200, plus patch-and-paint where holes are drilled.
• Crawl space: $1.00–$4.50 per square foot, or $500–$3,700 on average; closed-cell foam on crawl walls and rim joists runs $3–$7 per square foot.
• Rim / band joist (spray foam): typically $2,100–$2,800 for the job.
• Crawl space encapsulation (full vapor-barrier system, beyond insulation): $7–$15 per square foot.

Removal and disposal of old insulation

• Standard removal + disposal: $1–$2 per square foot, or about $800–$3,600 for a typical attic; disposal of non-hazardous material is usually included.
• Blown-in removal: $1–$1.50 per square foot (the cheapest to vacuum out).
• Spray foam removal: $3–$12 per square foot; it's bonded to the framing and labor-intensive to strip.
• Asbestos insulation: $10–$25 per square foot, due to mandatory hazmat handling and disposal.
• Rodent or contamination cleanup: add $0.50–$1.50 per square foot to sanitize after removal.

When it costs more and when it costs less

If you want to know which side of the range your job will land on, this is the honest breakdown.

You'll pay toward the high end when…

• You choose closed-cell spray foam over batts or blown-in.
• You're insulating finished walls that have to be drilled (drill-and-fill).
• The target R-value is high (R-49 to R-60 cold-climate attics).
• Old, wet, or contaminated insulation has to be removed first.
• Access is tight: low attics, cramped crawl spaces, multi-story walls.
• You're in a Northeast or West Coast metro with high labor rates.

You'll pay toward the low end when…

• You use fiberglass batts or blown-in in an open, easy-access attic.
• It's new construction with open stud cavities and no demolition.
• The target R-value is moderate (warm-climate R-30 to R-38).
• There's no old insulation to remove.
• The job is large enough to spread the minimum and mobilization across more square feet.
• You're in the South or a lower-cost-of-labor market.

The single biggest lever is material choice combined with area. A blown-in fiberglass attic in an easy single-story home is a predictable $1,500–$3,000; the same home spray-foamed at the roof deck with old insulation removed first can climb past $8,000.

Insulation costs by region

Region is one of the first things that moves an insulation quote, mostly through labor rates, demand, and local codes. These bands are derived from multiple aggregator and contractor sources and should be treated as directional, not a precise city-by-city matrix.

• Northeast (NY, MA, CT, NJ): runs 15–20% above the national average; higher labor costs and stricter energy codes push installed prices toward the top of every range.
• West Coast (CA, OR, WA): runs 20–25% above average; transportation, demand, and metro labor in San Francisco, Los Angeles, and Seattle drive the upper end.
• Midwest (IL, OH, MN): tracks national averages closely, often balancing material costs with more favorable labor rates; cold climates push attic R-value targets (and material) higher.
• South / Southeast (GA, TN, NC, TX): runs 10–15% below average on labor, though humid climates make crawl-space moisture control and air sealing a bigger part of the job.
• Mountain West (CO, UT): aligns near the national midrange in metros, with higher R-value targets in cold, high-altitude areas and occasional travel surcharges in rural counties.

No single source provided a fully verified, city-by-city pricing matrix, so use these as a starting point and confirm against two or three local quotes before you commit.

How insulation contractors quote and collect this

For a simple attic top-up the price is easy; for a whole-home retrofit, the quote is the sale. The contractors who win the bigger jobs are the ones who can measure the space, present clear material options with R-values and prices side by side, and make it painless to say yes on the spot. Claver for insulation pros lets you build a per-square-foot pricebook once for batts, blown-in, and spray foam, send a clean quote with line items and R-value options from the driveway, take a deposit to lock the job on your schedule, and offer consumer financing when a $9,000 whole-home foam job lands on a homeowner who was expecting an attic top-up, so the number you quote is the number you actually collect. See how the pieces fit on the insulation page, or browse more cost guides in the guides hub.

Methodology & sources. Ranges reflect 2025–2026 U.S. residential pricing aggregated from Angi, HomeAdvisor, HomeGuide, Forbes Home, Fixr, and Modernize cost data, cross-checked across multiple contractor sources. Numbers are national directional bands, not quotes; material, R-value, square footage, access, and your local labor market move every figure. The federal Energy Efficient Home Improvement Credit (Section 25C) expired December 31, 2025; verify current state, local, and utility rebates before relying on any incentive.