South Carolina Insulation Cost Calculator
Average insulation cost in South Carolina ranges from $1,300 to $4,300 depending on insulation type, area size, and labor rates.
Reviewed by MyProjectCost Team
South Carolina Insulation Cost Snapshot
| Item | South Carolina Average |
|---|---|
| Spray Foam | $1.38-$3.14/sq ft |
| Blown-In Cellulose | $0.74-$1.86/sq ft |
| Fiberglass Batt | $0.46-$1.30/sq ft |
| Rigid Foam Board | $0.88-$2.18/sq ft |
| Labor Rate | $1.50-$4/sq ft |
| Typical Project | $1,300 – $4,300 |
Insulation Cost by Location in South Carolina
| Location | Low | Average | High |
|---|---|---|---|
| Attic | $1,000 | $2,100 | $3,700 |
| Walls | $1,300 | $2,800 | $5,000 |
| Crawl Space | $900 | $1,900 | $3,400 |
| Basement | $1,100 | $2,400 | $4,200 |
Insulation Cost by City in South Carolina
| City | Average Project Cost |
|---|---|
| Columbia | $2,700 |
| Charleston | $3,000 |
| North Charleston | $2,900 |
| Mount Pleasant | $3,100 |
| Rock Hill | $2,600 |
Insulation Costs in South Carolina: What to Expect
South Carolina insulation costs are below the national average. The hot humid climate makes crawl space encapsulation and attic insulation critical.
South Carolina's humidity makes moisture management the top priority. Crawl space spray foam encapsulation is one of the best investments.
Best Insulation Types for South Carolina Homes
Spray Foam
Spray foam delivers superior air sealing and insulation performance for South Carolina homes at $1.38-$3.14/sq ft per square foot installed. Both open-cell and closed-cell spray foam expand to fill every crack and gap, making it ideal for South Carolina's climate demands — whether extreme heat, cold, or humidity. The higher upfront cost pays off through 15–20% lower energy bills and a lifespan exceeding 80 years.
Blown-In Cellulose
Blown-in cellulose is one of the best insulation choices for South Carolina homes, offering excellent coverage in attics and hard-to-reach spaces at $0.74-$1.86/sq ft per square foot installed. Made from recycled paper fiber treated for fire and pest resistance, cellulose fills gaps and settles evenly to block drafts specific to South Carolina's climate. It's a top pick for homeowners adding insulation over existing material without major demolition.
Fiberglass Batt
Fiberglass batt is the most budget-friendly insulation option for South Carolina homeowners at $0.46-$1.30/sq ft per square foot installed. Pre-cut rolls fit standard wall cavities and attic joists, making it straightforward to install in new construction and open-framing renovation projects across South Carolina. While not as airtight as spray foam, modern fiberglass batts with faced vapor barriers perform well in South Carolina's conditions when properly installed.
South Carolina Insulation Rebates and Tax Credits
Duke Energy and Dominion Energy SC offer rebates. Federal 30% tax credit applies.
Homeowners may also qualify for the federal Inflation Reduction Act tax credit of up to 30% (capped at $1,200) for qualifying insulation improvements.
South Carolina Insulation Permit Requirements
Most South Carolina insulation projects do not require a permit, though some municipalities may require one for spray foam. Typical costs $50-$250 if required. Check with your local building office before starting work.
South Carolina Insulation Cost Factors
- Hot humid climate
- Hurricane risk coastal areas
- Crawl space moisture
- Moderate labor costs
- Growing markets
FAQ — Insulation Cost in South Carolina
How much does insulation cost in South Carolina?
Most South Carolina homeowners spend $1,300-$4,300 for insulation installation.
Is insulation more or less expensive in South Carolina than the national average?
South Carolina costs are about 8% below the national average.
What is the cheapest insulation option in South Carolina?
Fiberglass batt at $0.46-$1.30 per square foot installed.
Related Calculators for South Carolina Homeowners
Insulation Cost in Other States
Compare insulation costs across states to see how South Carolina ranks nationally.