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 type | Installed cost / sq ft | 1,500 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 project | Local 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
Price your own job
These tables are averages. Punch in your real measurements for a number you can compare against a bid.
Statewide context
See how the Charleston metro compares with the rest of South Carolina.
Insulation cost by state (South Carolina included) →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 (30% of insulation and air-sealing materials, up to $1,200 a year) only covered improvements made through December 31, 2025. For work done now, most utilities offer their own attic and air-sealing rebates, and income-qualified households can get free weatherization. Always check with your utility before booking work.
Materials for an insulation job in Charleston, SC
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