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Insulation Cost by State (2026)

Insulation materials cost roughly the same everywhere — labor does not. Pick your state for installed prices per square foot, whole-job ranges and the R-values your climate zone calls for.

Cheapest states

Most expensive states

All states

AlabamaZone 3AlaskaZone 7ArizonaZone 3ArkansasZone 3CaliforniaZone 3ColoradoZone 5ConnecticutZone 5DelawareZone 4District of ColumbiaZone 4FloridaZone 2GeorgiaZone 3HawaiiZone 1IdahoZone 5IllinoisZone 5IndianaZone 5IowaZone 5KansasZone 4KentuckyZone 4LouisianaZone 2MaineZone 6MarylandZone 4MassachusettsZone 5MichiganZone 5MinnesotaZone 6MississippiZone 3MissouriZone 4MontanaZone 6NebraskaZone 5NevadaZone 3New HampshireZone 6New JerseyZone 4New MexicoZone 4New YorkZone 5North CarolinaZone 3North DakotaZone 6OhioZone 5OklahomaZone 3OregonZone 4PennsylvaniaZone 5Rhode IslandZone 5South CarolinaZone 3South DakotaZone 6TennesseeZone 4TexasZone 2UtahZone 5VermontZone 6VirginiaZone 4WashingtonZone 4West VirginiaZone 5WisconsinZone 6WyomingZone 6

Why the same attic costs 30% more one state over

Insulation is one of the few building materials that costs roughly the same everywhere. A bag of cellulose does not get more expensive because it crossed a state line. What changes is the crew: their wages, their insurance, their drive time, and what the local market will bear.

That is why every state page here starts from the same national rate and applies a local labor index to it. The material half of the price barely moves; the labor half is what separates a job in Mississippi from the identical job in Massachusetts.

It also means the DIY saving is much larger in expensive markets. Where labor is cheap, doing it yourself saves a modest amount of money for a weekend of awkward work. Where labor is expensive, the same weekend can be worth several times more.

Climate zone changes what you are buying, not just what it costs

Each state page also shows its climate zone, and that matters more than the price difference. The Department of Energy recommends R-30 in an attic in south Florida and R-60 across the northern half of the country — twice the depth of material for the same square footage.

So two states can show a similar cost per square foot and still produce very different quotes for the same size attic, simply because one is buying twice as much insulation. When comparing states, compare the whole-job figure rather than the rate.

States that span more than one zone are listed at the zone most of their population lives in. If you are in the mountains of a mostly-warm state, use the colder target.

How to use these numbers with a contractor

Treat the per-square-foot figure as a sanity check, not a negotiating position. A quote well above it usually has a reason — removal of old material, poor access, knee walls and dormers priced separately, or air sealing included — and those reasons are often worth paying for.

The useful question is not why the quote is above the average, it is what is in it. Ask whether removal is included, whether the ceiling plane gets air sealed before anything is blown, and whether baffles are being installed at the eaves. A cheaper quote that skips all three is not cheaper.

Get the R-value in writing rather than the depth. Depth settles; the rating is what you are buying.