SmartInsulationCalculator

2026 cost data

Insulation Cost in Connecticut (2026)

Insulation in Connecticut costs well above the national average — ranked 44 of 51 for installed price. Connecticut sits in climate zone 5, so attics should hit R-60.

Insulation prices per square foot

Installed prices — material plus labor — adjusted for Connecticut labor rates.

Job typeInstalled cost / sq ft1,500 sq ft attic
Attic blown-in fiberglass (R-49)$2.26$3,386
Attic blown-in cellulose (R-49)$2.07$3,111
Attic fiberglass batts (R-38)$1.95$2,928
Wall batts, open framing (R-15)$2.13$3,202
Wall dense-pack retrofit (drill & fill)$3.17$4,758
Crawlspace floor or wall insulation$2.56$3,843
Basement rigid foam + framing$3.78$5,673
Open-cell spray foam (3.5")$2.38$3,569
Closed-cell spray foam (2")$4.39$6,588
Old insulation removal & disposal$1.89$2,837

What whole jobs cost

Typical projectLocal price range
Attic top-up (1,500 sq ft)$1,830 – $3,172
Full attic removal + re-insulate$3,904 – $6,588
Whole-house wall retrofit (2,000 sq ft home)$5,124 – $9,516
Crawlspace encapsulation + insulation$4,636 – $10,980
Garage conversion insulation$1,098 – $2,684
Whole-home spray foam (new build)$9,150 – $19,520

Climate zone 5 R-value targets

Department of Energy retrofit recommendations for this zone.

Attic
R-60
Walls
R-20
Floors
R-30
Check your current R-value →

Price your own job

These tables are averages. Punch in your real measurements for a number you can compare against a bid.

Insulation costAtticBlown-in bagsProject total

Cities in Connecticut

Hartford

Insulation cost FAQs for Connecticut

How much does attic insulation cost in Connecticut?

A 1,500 sq ft attic blown to R-49 runs about $2,878 to $4,063 installed in Connecticut, or roughly $2.26 per square foot. DIY with rented equipment cuts that by 45–60%.

Is insulation cheaper to DIY in Connecticut?

Yes. Labor is most of an insulation bid, so blowing your own attic or installing batts typically saves 45–60% of the installed price. Spray foam, dense-pack wall retrofits and removal jobs are worth hiring out.

What drives insulation prices in Connecticut?

Local labor rates, how far crews travel, attic access, whether old insulation has to be removed first, and the R-value your climate zone calls for. Material prices barely change between states — labor is the swing factor.

Are there rebates in Connecticut?

The federal 25C tax credit covers 30% of insulation and air-sealing material costs up to $1,200 per year, and most utilities add their own attic and air-sealing rebates. Always check with your utility before booking work.

Materials for an insulation job in Connecticut

Fiberglass Insulation Rolls R13Browse current prices and top-rated options on Amazon

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