Basic
$0.87 – $1.97 per sq ft
Unfaced R-21 high-density fiberglass batts friction-fit in 2x6 walls, vapor retarder where code requires
How Much Does R21 Insulation Cost in Charleston, South Carolina?
Supply and install R-21 high-density fiberglass batt insulation in 2x6 exterior wall cavities.
R21 Insulation in Charleston, South Carolina typically costs $1.02 to $2.32 per sq ft as of 2026. Prices reflect local labor and material rates. Use our calculator below for a detailed, ZIP-code-adjusted estimate.
R21 Insulation in Charleston, South Carolina
$1.02 – $2.32
per sq ftPrices in Charleston are 8.0% lower than the national average for r21 insulation.
National average: $1.10 – $2.50 per sq ft
What you get at each price level
Standard
$1.02 – $2.32 per sq ft
Kraft-faced R-21 high-density batts stapled to studs, split around wiring and cut tight around boxes and pipes
Premium
$1.28 – $2.90 per sq ft
Formaldehyde-free R-21 high-density batts fitted tight without gaps, split around wiring, cut tight at boxes and pipes, window gaps filled
Cost Breakdown in Charleston
| Component | Category | Price Range | Unit |
|---|---|---|---|
| Materials | material | $0.48 – $1.08 | sq ft |
| Labor | labor | $0.33 – $0.77 | sq ft |
| Supplies & Other | supplies | $0.12 – $0.29 | sq ft |
| Equipment & Disposal | equipment | $0.09 – $0.19 | sq ft |
Prices adjusted for Charleston local market conditions.
Cost Factors in Charleston, South Carolina
What Affects Pricing
- Materials ($0.50-$1.12 per square foot)
- Labor ($0.38-$0.88 per square foot)
- Supplies & Other ($0.13-$0.30 per square foot)
- Equipment & Disposal ($0.09-$0.20 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
- Insulation Installation Cost Per Sq Ft (2026), EZ-Estimates, ez-estimates.com, 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 r21 insulation contractors in Charleston for personalized quotes based on your specific project.