Spray Foam Insulation cost: North Charleston vs Rock Hill (2026)
The two metros aren't quite in sync on spray foam insulation: North Charleston sits 4% above Rock Hill, or roughly $3,800 versus $3,650 — about $150 apart.
North Charleston SC
Typically around $3,800
Rock Hill SC
Lower costTypically around $3,650
North Charleston vs Rock Hill: full breakdown
| Factor | North Charleston | Rock Hill |
|---|---|---|
| Typical 2026 cost | $3,800 | $3,650 |
| Estimated range | $1,500–$6,100 | $1,450–$5,800 |
| Labor index (vs US) | ×0.99 | ×0.95 |
| Climate zone | Hot | Hot |
| Climate factor | ×1.02 | ×1.02 |
| Local permit | None | None |
| Labor share | $2,100 | $2,000 |
| Materials/equipment | $1,700 | $1,650 |
These are 2026 planning figures for spray foam insulation, localized to each city — not formal quotes.
How much should this gap actually matter?
A 4% 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: North Charleston vs Rock Hill
Below, each spray foam insulation option is priced independently for both cities, with identical local labor, climate and permit logic applied — so the comparison holds up.
| Type | North Charleston | Rock Hill |
|---|---|---|
| Open-cell | $1,500–$4,550 | $1,450–$4,350 |
| Closed-cell | $2,550–$7,100 | $2,400–$6,800 |
Localized 2026 planning estimates — not quotes. Each city adjusts the national spray foam insulation range for local labor, climate and permits.
Spray foam insulation by area: North Charleston vs Rock Hill
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 | North Charleston | Rock Hill |
|---|---|---|
| 500 sq ft | $900–$2,450 | $850–$2,350 |
| 1,000 sq ft | $1,500–$4,050 | $1,450–$3,900 |
| 1,500 sq ft | $2,250–$5,600 | $2,150–$5,350 |
| 2,000+ sq ft | $2,850–$6,600 | $2,700–$6,300 |
Localized 2026 planning estimates — not quotes. Each city adjusts the national spray foam insulation range for local labor, climate and permits.
Cheapest time for spray foam insulation in either city
The fall insulation rush drives prices up because everyone's thinking about the coming winter at once. Book in spring or summer instead, when demand is lower and rebate funds haven't been claimed yet.
How much insulation is worth paying for?
R-value, air-sealing and material decide both the price and the payback. Our editors on the trade-offs.
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
Skip air-sealing and you're insulating around the very holes letting conditioned air leak out. Caulk, foam and weatherstripping are inexpensive and often return more felt comfort than a thicker blanket of insulation ever would — insist the crew handles the leaks before they bury them.
The R-value case
Insulate to the DOE recommendation for your climate zone — under-insulating to save money leaves comfort and energy savings on the table that would have paid the job back.
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.
North Charleston vs Rock Hill
Is spray foam insulation cheaper in North Charleston or Rock Hill?
In 2026, spray foam insulation is cheaper in Rock Hill at about $3,650, versus $3,800 in North Charleston — a difference of about $150 (4%).
Why does spray foam insulation cost more in North Charleston than Rock Hill?
North Charleston's higher labor index (0.99 vs 0.95 in Rock Hill) is the biggest factor, with the hot/hot climate split playing a smaller role.
How much is spray foam insulation in North Charleston, SC?
Expect to pay $1,500 to $6,100 for spray foam insulation in North Charleston in 2026, averaging around $3,800.
When is the cheapest time to buy spray foam insulation — and does it differ by city?
No, the seasonal pattern is the same in North Charleston and Rock Hill: book during Spring and summer for about 5–10% in savings. The pre-winter fall rush is the priciest stretch in both cities, mostly due to emergency replacements.
Should I choose where to live based on spray foam insulation cost?
That would be a stretch. $150 is a one-time difference, not an ongoing one, and off-season buying plus apples-to-apples bids in North Charleston can close a good chunk of it. What matters more long-term is energy costs, climate and the condition of the home.
Compare spray foam insulation in other cities
Updated June 2026 · By Serhat Özçelik