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2026 cost data

Insulation Cost in Boston, MA (2026)

Insulation contractors in Boston, MA price well above the national average. Here is what attic, wall, crawlspace and spray foam work should cost in the Boston metro in 2026.

Insulation prices per square foot

Installed prices — material plus labor — adjusted for Boston, MA labor rates.

Job typeInstalled cost / sq ft1,500 sq ft attic
Attic blown-in fiberglass (R-49)$2.48$3,719
Attic blown-in cellulose (R-49)$2.28$3,417
Attic fiberglass batts (R-38)$2.14$3,216
Wall batts, open framing (R-15)$2.35$3,518
Wall dense-pack retrofit (drill & fill)$3.48$5,226
Crawlspace floor or wall insulation$2.81$4,221
Basement rigid foam + framing$4.15$6,231
Open-cell spray foam (3.5")$2.61$3,920
Closed-cell spray foam (2")$4.82$7,236
Old insulation removal & disposal$2.08$3,116

What whole jobs cost

Typical projectLocal price range
Attic top-up (1,500 sq ft)$2,010 – $3,484
Full attic removal + re-insulate$4,288 – $7,236
Whole-house wall retrofit (2,000 sq ft home)$5,628 – $10,452
Crawlspace encapsulation + insulation$5,092 – $12,060
Garage conversion insulation$1,206 – $2,948
Whole-home spray foam (new build)$10,050 – $21,440

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

Statewide context

See how the Boston metro compares with the rest of Massachusetts.

Insulation cost in Massachusetts →

Insulation cost FAQs for Boston, MA

How much does attic insulation cost in Boston, MA?

A 1,500 sq ft attic blown to R-49 runs about $3,161 to $4,462 installed in Boston, MA, or roughly $2.48 per square foot. DIY with rented equipment cuts that by 45–60%.

Is insulation cheaper to DIY in Boston, MA?

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 Boston, MA?

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 Boston, MA?

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 Boston, MA

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

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