Basic
$1.10 – $2.68 per sq ft
Loose-fill fiberglass blown over the attic floor to an R-40 settled depth, eave baffles and depth markers set
How Much Does R40 Insulation Cost in Charleston, South Carolina?
Supply and install about R-40 attic insulation (blown-in, roughly 13-15 in) over the attic floor.
R40 Insulation in Charleston, South Carolina typically costs $1.30 to $3.16 per sq ft as of 2026. Prices reflect local labor and material rates. Use our calculator below for a detailed, ZIP-code-adjusted estimate.
R40 Insulation in Charleston, South Carolina
$1.30 – $3.16
per sq ftPrices in Charleston are 8.0% lower than the national average for r40 insulation.
National average: $1.40 – $3.40 per sq ft
What you get at each price level
Standard
$1.30 – $3.16 per sq ft
Blown fiberglass to R-40 with rafter baffles at the eaves, hatch dam, clearance kept around flues and recessed lights
Premium
$1.62 – $3.95 per sq ft
Blown fiberglass to R-40 with rafter baffles at every eave bay, hatch dam, insulated and weatherstripped hatch, depth markers
Cost Breakdown in Charleston
| Component | Category | Price Range | Unit |
|---|---|---|---|
| Materials | material | $0.60 – $1.47 | sq ft |
| Labor | labor | $0.43 – $1.03 | sq ft |
| Supplies & Other | supplies | $0.16 – $0.39 | sq ft |
| Equipment & Disposal | equipment | $0.11 – $0.27 | sq ft |
Prices adjusted for Charleston local market conditions.
Cost Factors in Charleston, South Carolina
What Affects Pricing
- Materials ($0.63-$1.53 per square foot)
- Labor ($0.49-$1.18 per square foot)
- Supplies & Other ($0.17-$0.41 per square foot)
- Equipment & Disposal ($0.11-$0.28 per square foot)
Local Price Adjustments
Material costs4.0% below avg
Labor costs13.0% below avg
Material costs in Charleston run proportionally higher than labor, which may favor labor-intensive approaches.
Frequently Asked Questions
References
- Attic Insulation Installation Cost Guide, The Home Depot, The Home Depot, retrieved Nov 2026
- Construction wages by metro and rural area, used for the labor adjustment by ZIP code, U.S. Bureau of Labor Statistics, Occupational Employment and Wage Statistics, May 2025
- Regional price parities for goods, used for the materials adjustment by ZIP code, U.S. Bureau of Economic Analysis, 2024
Get Free Estimates in Charleston
Connect with local r40 insulation contractors in Charleston for personalized quotes based on your specific project.