Spray Foam Insulation cost: Charleston vs Florence (2026)
The two metros aren't quite in sync on spray foam insulation: Charleston sits 6% above Florence, or roughly $3,800 versus $3,600 — about $200 apart.
Charleston SC
Typically around $3,800
Florence SC
Lower costTypically around $3,600
Charleston vs Florence: full breakdown
| Factor | Charleston | Florence |
|---|---|---|
| Typical 2026 cost | $3,800 | $3,600 |
| Estimated range | $1,500–$6,100 | $1,450–$5,700 |
| Labor index (vs US) | ×0.99 | ×0.93 |
| Climate zone | Hot | Hot |
| Climate factor | ×1.02 | ×1.02 |
| Local permit | None | None |
| Labor share | $2,100 | $2,000 |
| Materials/equipment | $1,700 | $1,600 |
Spray foam insulation numbers here are 2026 planning ranges, adjusted per city — useful for budgeting, not a substitute for an actual quote.
Is the price difference a dealbreaker?
A 6% difference on spray foam insulation is minor — you'll typically see a wider spread just from getting multiple quotes in the same city, so don't let location drive the decision.
Spray foam insulation by type: Charleston vs Florence
We localize each spray foam insulation type separately for both metros, applying the same labor, climate and permit adjustments each time, so you're comparing like for like.
| Type | Charleston | Florence |
|---|---|---|
| Open-cell | $1,500–$4,550 | $1,450–$4,300 |
| Closed-cell | $2,550–$7,100 | $2,400–$6,650 |
Treat these as 2026 localized estimates for spray foam insulation, not quotes from a contractor.
Spray foam insulation by area: Charleston vs Florence
Spray foam is priced by board foot (1 sq ft at 1 inch thick), which works out to about $1.50–$5 per sq ft of surface installed depending on foam type and thickness. Closed-cell costs more but adds twice the R-value per inch.
| Size | Charleston | Florence |
|---|---|---|
| 500 sq ft | $900–$2,450 | $850–$2,300 |
| 1,000 sq ft | $1,500–$4,050 | $1,450–$3,800 |
| 1,500 sq ft | $2,250–$5,600 | $2,100–$5,250 |
| 2,000+ sq ft | $2,850–$6,600 | $2,650–$6,200 |
These are 2026 planning figures for spray foam insulation, localized to each city — not formal quotes.
Cheapest time for spray foam insulation in either city
Demand for insulation spikes every fall as winter approaches, pushing prices with it. Spring and summer avoid that crowd, and utility rebate pools are frequently still fresh that early in the year.
How much insulation is worth paying for?
Three choices shape an insulation budget — target R-value, whether air-sealing is included, and material type. Our editors weigh how each affects payback.
The R-value case
The DOE publishes a target R-value for every climate zone, and there's a reason to reach it: stopping short shaves a little off install day but forfeits years of lower energy bills and steadier indoor temperatures. Under-insulating is the one shortcut here that never actually pays.
The rebate case
Insulation carries some of the strongest incentive money in remodeling, with utility and state rebates covering a real portion of the cost since the federal 25C credit expired at the end of 2025. Look up what applies on DSIRE, then schedule the work while rebate funds are still unclaimed for the year.
The air-sealing case
Insulation without air-sealing underperforms. Sealing leaks first is cheap and often delivers more comfort per dollar than thicker insulation alone — make sure it's in the scope.
Rare among home projects, insulation punishes the half-measure — the money saved by under-insulating or skipping the air-seal comes back as higher bills. Meet the DOE R-value for your zone, seal the leaks first, and use the rebates on the table.
Charleston vs Florence
Is spray foam insulation cheaper in Charleston or Florence?
Florence comes out ahead here, at roughly $3,600 for spray foam insulation compared with $3,800 in Charleston — a 6% ($200) gap as of 2026.
Why does spray foam insulation cost more in Charleston than Florence?
Charleston's higher labor index (0.99 vs 0.93 in Florence) is the biggest factor, with the hot/hot climate split playing a smaller role.
How much is spray foam insulation in Charleston, SC?
In Charleston, spray foam insulation typically runs $1,500–$6,100 in 2026, with most homeowners paying around $3,800.
When is the cheapest time to buy spray foam insulation — and does it differ by city?
Timing doesn't change by city here — Spring and summer is the cheapest window in both Charleston and Florence, saving roughly 5–10%. Avoid the pre-winter fall rush in either location, when emergency replacements push prices up.
Should I choose where to live based on spray foam insulation cost?
Rarely. The $200 difference is real but one-time, and you can often close most of it in Charleston by buying in the off-season and getting tighter, apples-to-apples bids. Ongoing factors — energy prices, climate and home condition — matter more over the life of the system.
Compare spray foam insulation in other cities
Updated June 2026 · By Serhat Özçelik