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What does blown-in insulation cost per square foot?

Blown-in insulation costs $0.50-$2.30 per square foot by material. See fiberglass vs cellulose pricing and what a typical attic job runs.

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What does blown-in insulation cost per square foot?

What does blown-in insulation cost per square foot?

Blown-in fiberglass runs $0.50 to $1.10 per square foot in material and labor, and cellulose runs $0.60 up to about $2.30 per square foot for dense-pack (HomeAdvisor, 2025). Whole-project pricing, once labor and equipment are included, works out to roughly $1.75 to $7.50 per square foot depending on material and job complexity.

Figures as cited in Sources below
Blown-in materialCost per sq ftSource
Fiberglass$0.50-$1.10HomeAdvisor, 2025
Cellulose (wet-spray)$0.60-$1.80HomeAdvisor, 2025
Cellulose (dense-pack)$2.00-$2.30HomeAdvisor, 2025
Mineral wool (Rockwool)$1.40-$2.10HomeAdvisor, 2025
What does blown-in insulation cost per square foot?

What does a typical attic job cost, all in?

A typical blown-in job averages about $1,660, with most homeowners spending between $986 and $2,333 (HomeAdvisor, 2025). For the full picture by attic size and by every material type - not just blown-in - see our [attic insulation cost](/cost/) guide.

Sources

1 cited
  1. Blown-in fiberglass and cellulose cost per square foot, and whole-project range: HomeAdvisor, Cost to Install Blown-In Insulation, 2025 (checked 2026-08-19).
How it works

How blown-in insulation is actually installed

Four steps, done in order. The Department of Energy is explicit that skipping the air-sealing step is the most common way a new insulation job still leaves an attic underperforming.

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  1. 1

    Air seal first

    The EPA recommends sealing attic-floor penetrations before insulating, because loose-fill does not stop air moving through gaps around wiring, pipes and fixtures.

  2. 2

    Add baffles and depth markers

    Rafter baffles keep blown material off the eaves where it could get wet, and depth rulers mark the target R-value before the blower starts.

  3. 3

    Blow to depth

    A pneumatic machine feeds loose fiberglass or cellulose over the attic floor, covering the tops of the joists so heat cannot bypass the insulation.

  4. 4

    Verify and clean up

    The settled depth gets checked against the target R-value for your climate zone, then tools and debris are cleared.

How we work

What this site will and will not do

We explain the R-value target and the real cost drivers first, and we do not sell you the installation - which is why we can say plainly when topping up beats a full replacement.

01

R-value before a quote

ENERGY STAR recommends R-30 to R-60 depending on your climate zone. Knowing your target before you call means you can hold every bid to the same number.

02

Air sealing first, always

The Department of Energy is explicit that insulation slows heat flow but does not stop air leaks - sealing gaps first is what makes the insulation you pay for actually perform.

03

We are not the installer

We do not install anything ourselves, so we have nothing to gain from steering you toward the bigger job. Licensed local companies do the work and quote it themselves.

04

Nothing we cannot source

Every figure on this site traces to a named, dated source - HomeAdvisor, the DOE, ENERGY STAR, the EPA or the FTC. Where we have not sourced a number, we say so instead of guessing.

Questions

Frequently asked

The questions people actually type before calling a company.

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Is blown-in fiberglass or cellulose cheaper per square foot?

Fiberglass is generally cheaper, at $0.50 to $1.10 per square foot versus $0.60 to $1.80 for standard cellulose (up to $2.30 for dense-pack), per HomeAdvisor's 2025 data.

How much does a whole blown-in insulation job cost?

A typical job averages about $1,660, with most homeowners spending between $986 and $2,333 (HomeAdvisor, 2025).

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