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2026 cost data

Insulation Cost in Charleston, SC (2026)

Insulation contractors in Charleston, SC price close to the national average. Here is what attic, wall, crawlspace and spray foam work should cost in the Charleston metro in 2026.

Insulation prices per square foot

Installed prices — material plus labor — adjusted for Charleston, SC labor rates.

Job typeInstalled cost / sq ft1,500 sq ft attic
Attic blown-in fiberglass (R-49)$1.72$2,581
Attic blown-in cellulose (R-49)$1.58$2,372
Attic fiberglass batts (R-38)$1.49$2,232
Wall batts, open framing (R-15)$1.63$2,441
Wall dense-pack retrofit (drill & fill)$2.42$3,627
Crawlspace floor or wall insulation$1.95$2,930
Basement rigid foam + framing$2.88$4,325
Open-cell spray foam (3.5")$1.81$2,720
Closed-cell spray foam (2")$3.35$5,022
Old insulation removal & disposal$1.44$2,162

What whole jobs cost

Typical projectLocal price range
Attic top-up (1,500 sq ft)$1,395 – $2,418
Full attic removal + re-insulate$2,976 – $5,022
Whole-house wall retrofit (2,000 sq ft home)$3,906 – $7,254
Crawlspace encapsulation + insulation$3,534 – $8,370
Garage conversion insulation$837 – $2,046
Whole-home spray foam (new build)$6,975 – $14,880

Climate zone 3 R-value targets

Department of Energy retrofit recommendations for this zone.

Attic
R-49
Walls
R-20
Floors
R-25
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 Charleston metro compares with the rest of South Carolina.

Insulation cost in South Carolina →

Insulation cost FAQs for Charleston, SC

How much does attic insulation cost in Charleston, SC?

A 1,500 sq ft attic blown to R-49 runs about $2,194 to $3,097 installed in Charleston, SC, or roughly $1.72 per square foot. DIY with rented equipment cuts that by 45–60%.

Is insulation cheaper to DIY in Charleston, SC?

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 Charleston, SC?

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 Charleston, SC?

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 Charleston, SC

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

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