How Much Does Attic Insulation Cost?

Updated October 2026 · 5 public sources cited

Attic insulation is one of the cheaper energy upgrades with a real comfort payoff. Here are national prices, how R-value changes the bill, and where utility rebates can cut it.

National average

$1,000 – $2,700

HomeGuide's national average range to insulate an attic, with a national average of $1,800. Small jobs start around $500 and large ones reach $6,000.¹

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Prices by type and R-value

Job	National range
Typical attic insulation job	$1,000 – $2,700 (average $1,800)
Blown-in to R-49, per 1,000 sq ft	$1,100 – $1,900
Blown-in to R-60, per 1,000 sq ft	$1,400 – $2,400
Spray foam, attic floor	$1,100 – $6,800

Figures are HomeGuide's national ranges.¹² Your price depends on attic size, the R-value you're targeting, how much insulation is already there, and access.

Blown-in, batts or spray foam?

Blown-in (loose-fill) fiberglass or cellulose is the most common choice for open attic floors. It fills around joists and wiring and is the cheapest way to add depth.
Batts work in open, regular joist bays and are popular for DIY, but gaps and compression lower real-world performance.
Spray foam costs more. It's usually chosen for unvented (conditioned) attics, roof decks, or attics with ductwork and equipment.

Whatever the material, air sealing first (top plates, light fixtures, plumbing and duct penetrations, the attic hatch) is what makes insulation perform. Good contractors include it or quote it separately.

How much insulation you need

ENERGY STAR recommends R-30 to R-49 for uninsulated attics in the warmest zone, R-30 to R-60 in zones 2–3, and R-49 to R-60 in zones 4–8.³ Many older homes have far less. See our attic insulation R-value guide for the full chart.

Removal and replacement

Old insulation doesn't always need to come out. Removal makes sense when it's wet, moldy, contaminated by pests, or blocking air sealing. Removal is an added cost on top of new insulation.

One important exception: if your attic has vermiculite (pebbly, gray-brown or gold), don't disturb it. EPA advises assuming it may contain asbestos and leaving it alone unless a trained professional handles it.⁵ See our vermiculite guide.

Rebates and incentives

Federal tax credit: the IRS says the Energy Efficient Home Improvement Credit covers improvements made through December 31, 2025.⁴ Insulation installed in 2026 doesn't qualify.

Utility programs are now the main source of help, and they vary a lot. Examples from our city guides:

Sacramento: SMUD Seal and Insulate rebates up to $3,000 through a program contractor.
Rochester: NYSERDA Comfort Home incentives.
Boston: Mass Save insulation offers of 75–100% off approved work.
Phoenix: SRP rebate up to $600.
Detroit: DTE attic insulation rebate.
San Antonio: CPS Energy per-square-foot rebate.
Austin: Austin Energy rebates.

Most programs require a participating contractor and pre-approval, so check before work starts. Other city guides: Charlotte, Cincinnati, Cleveland, Grand Rapids, Indianapolis, Kansas City, Las Vegas, Louisville, Minneapolis, Philadelphia and St. Louis.

How to compare quotes

Ask for the target R-value and the installed depth, not just the number of bags.
Ask what air sealing is included and where.
Ask about baffles at the eaves to keep soffit vents clear.
Ask how they'll handle the attic hatch, recessed lights and bath fan ducts.
Confirm whether the contractor participates in your utility's rebate program.

Common questions

How much does attic insulation cost?

HomeGuide's national average range is $1,000 to $2,700, with a national average of $1,800. Small jobs can start around $500 and large ones reach $6,000.

How much does blown-in insulation cost per 1,000 square feet?

HomeGuide puts blown-in insulation to R-49 at $1,100 to $1,900 per 1,000 sq ft, and to R-60 at $1,400 to $2,400.

Is there still a federal tax credit for attic insulation?

No. The IRS says the Energy Efficient Home Improvement Credit covers improvements made through December 31, 2025.

Should old attic insulation be removed?

Only if it's wet, moldy, pest-contaminated or blocking air sealing. Never disturb vermiculite yourself; EPA advises assuming it may contain asbestos.

Are there rebates for attic insulation?

Many utilities offer them, often requiring a participating contractor and pre-approval. Amounts vary widely by utility.

General information summarized from the public sources listed below. It isn't professional, medical or legal advice. A licensed professional who inspects your home can tell you what it needs.