How much does spray foam insulation cost per square foot?
Spray foam insulation is priced per square foot after an in-home assessment. Final cost depends on foam type, required R-value (thickness), and site conditions. We confirm the per‑square‑foot rate and total price on site before work begins in Charleston, North Charleston, and nearby areas.
What affects price:
- Open‑cell vs closed‑cell foam
- Thickness/R‑value and coverage area
- Attic or crawlspace access and prep
- Old insulation removal and air sealing needs
- Ventilation or moisture corrections
Updated: 2025-12-24 00:00:00
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Sources
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