Quick answer: Spray foam insulation in South Carolina costs $1.00–$1.60 per board foot for open-cell and $1.60–$2.60 per board foot for closed-cell. Full scopes are quoted from measured board feet after an on-site evaluation of thickness, access, prep, and existing insulation. Most jobs finish in one day. Final pricing depends on access, required thickness, and any removal of existing insulation.
I’m going to be straight with you, because that’s how we’ve run this company for more than 15 years: there is no honest flat price for a spray foam job. We’re South Carolina Spray Foam Insulation, a family-owned company insulating homes and commercial buildings across Greenville and the rest of the Upstate. This page shows you exactly how the spray foam insulation cost Greenville homeowners see on a quote actually gets built, so you can check any number you’re handed — ours included.
We Price by the Board Foot — Here’s What That Means
A board foot is one square foot of coverage at one inch thick. Every legitimate spray foam estimate starts there: measure the area, choose the thickness, multiply for board feet, then apply the installed rate.
- Open-cell spray foam: $1.00 to $1.60 per board foot installed, at roughly R-3.5 to R-4 per inch.
- Closed-cell spray foam: $1.60 to $2.60 per board foot installed, at roughly R-6 to R-7 per inch, with a built-in vapor retarder.
So 1,000 square feet at one inch deep is 1,000 board feet. At three inches it’s 3,000 board feet — and the cost scales right along with the thickness, with thicker closed-cell multiplying by the same per-board-foot rate.
The per-board-foot rate is the honest anchor; the total simply follows from the board feet your job actually needs. We don’t publish flat project prices — your real quote reflects access, prep, and what’s already sitting in the cavity, which is why we quote only after an on-site insulation evaluation, never sight unseen.
What Moves Your Number Up or Down
Thickness and R-value target. Greenville sits in IECC Climate Zone 3A. Hitting a given R-value with open-cell takes noticeably more inches than closed-cell — more board feet on the same square footage.
Open-cell vs. closed-cell. Closed-cell is denser, slower to apply, and costs more per inch — but on crawl space foundation walls and rim joists in our humid Piedmont climate, it’s the right product, not the upsell.
Access. An open attic in Greer applies fast. A low-clearance crawl space under an older Anderson or Easley home takes our crew longer per square foot, and that labor shows up in the quote.
Prep and removal. Wet, sagging fiberglass batts usually have to come out before we foam. Removal and disposal add to the job, and we’ll flag them during the evaluation instead of surprising you later.
Scope beyond foam. Air sealing, a ground vapor barrier in the crawl space, new construction versus retrofit — each changes the board feet and the hours. We handle all of it, residential and commercial, and the quote reflects what your building actually needs.
Rebates and Tax Credits: The 2026 Status
Duke Energy serves most of the Upstate and offers rebates for qualifying insulation and air-sealing work. The amounts vary by measure and change annually, so confirm current amounts before you count them into your budget — we’ll point you toward the right program during your estimate.
On the federal side, the 25C energy-efficiency tax credit expired December 31, 2025. No federal insulation tax credit is active right now, and any contractor still advertising one is behind on the news.
Get a Real Number for Your Home or Building
The only honest way to price spray foam is to stand in the space with a tape measure. Call South Carolina Spray Foam Insulation, and we’ll come out, evaluate the job, and hand you a quote built on board feet, not guesswork. Family-owned, 15-plus years, residential and commercial, serving Greenville and the entire Upstate.
How Much Does Crawl Space Encapsulation Cost in Greenville, SC?
We're South Carolina Spray Foam Insulation, a family-owned company with more than 15 years insulating homes and commercial buildings across Greenville and the Upstate. When people ask us about crawl space encapsulation Greenville cost, the honest answer starts with how spray foam is measured.
That thickness caveat matters in crawl spaces. A thin pass of foam is not the same job as a thicker moisture-control assembly on foundation walls and rim joists, and Greenville crawl spaces do not all need the same amount of work.
Greenville sits in IECC Zone 3A, a humid subtropical part of the Piedmont near the Blue Ridge foothills. Red clay soil and humid air along the I-85 corridor make crawl space moisture a real concern, so the right scope depends on conditions under the house.
We do not sell a turnkey liner, dehumidifier, and sump encapsulation package. If that is what your crawl space needs, we will be direct about the distinction.
That is the only way to give a responsible board-foot quote. It also keeps us from pretending every Greenville crawl space has the same scope.
If you are comparing crawl space encapsulation Greenville cost, start with the board-foot rates: open-cell at $1.00 to $1.60 per board foot installed, and closed-cell at $1.60 to $2.60 per board foot installed.
