Spray Foam Insulation Cost Calculator
Spray foam costs $1,767 to $7,322 for 1,000 square feet in Atlanta, and the spread is not a margin — it is the depth. ⚠️ Foam is sold by the board-foot, one square foot at one inch, so a price per square foot with no depth attached is not a price for anything. At the same R-value the two foams are far closer than their unit prices: closed-cell is about a tenth dearer at R-13, not 2.7×.
Estimate the cost for your home
Estimated cost of the foam
$2,359
typical · range $1,880 to $2,838 · 3,500 board-feet · R-12.3 · $2.36 per sq ft · 17 trade hours
⚠️ This figure leaves the foam bare, which is lawful in some places and not in others — foam plastic is a plastic, and the code wants a thermal barrier over it in space people occupy and an ignition barrier where they do not. If your job needs one, add it above: it is a real line and it is missing from most quotes. And whatever the finish, EPA guidance on the professional system says re-entry waits until the foam has cured and the building has been ventilated, with twenty-four hours a commonly recommended figure that varies by product.
Labour priced at national wages. Enter a ZIP code to price it for your area. 66% of this figure comes from modelled foam chemical, coatings and board — each line shows its own uncertainty.
Priced from archive.epa.gov Aug 2026bls.gov Aug 2026how every line is sourced
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The figure above is already calculated. Each step just makes it more yours, and you can stop at any of them.
A price per square foot is not a price for spray foam
Foam is sold by the board-foot — one square foot at one inch — so the depth is half the quantity. Your 1,000 sq ft, at every depth:
| Depth | Open-cell | Closed-cell |
|---|---|---|
| 1″ | $1,246R-3.5 · $1.25/sq ft | $1,627R-6.5 · $1.63/sq ft |
| 2″ | $1,691R-7 · $1.69/sq ft | $2,738R-13 · $2.74/sq ft |
| 3″ | $2,136R-10.5 · $2.14/sq ft | $3,849R-19.5 · $3.85/sq ft |
| 4″ | $2,581R-14 · $2.58/sq ft | $4,960R-26 · $4.96/sq ft |
| 5″ | $3,026R-17.5 · $3.03/sq ft | $6,072R-32.5 · $6.07/sq ft |
| 6″ | $3,472R-21 · $3.47/sq ft | $7,183R-39 · $7.18/sq ft |
| 8″ | $4,362R-28 · $4.36/sq ft | $9,405R-52 · $9.41/sq ft |
⚠️ This is why “how much to spray foam 1,000 square feet” has no answer. Between one inch and eight the same surface goes from $1,246 to $9,405 — a factor of 8. If a quote gives you a price per square foot and no depth, it is not a quote for anything yet: ask how many inches, because the R-value follows the inches and nothing else.
Closed-cell costs about 2.7× per board-foot — and nothing like that at the same R
Because it is R-6.5 an inch against R-3.5, so it takes far fewer inches to get to the same place. Both figures are the EPA’s, not ours.
| To reach | Open-cell | Closed-cell | Closed-cell premium |
|---|---|---|---|
| R-13 | 3.71″ · $2.45/sq ftfits a 2 × 6 wall | 2″ · $2.74/sq ftfits a 2 × 4 wall | +12% |
| R-19 | 5.43″ · $3.22/sq ftfits a 2 × 6 wall | 2.92″ · $3.76/sq ftfits a 2 × 4 wall | +17% |
| R-30 | 8.57″ · $4.62/sq ftfits a 2 × 10 rafter or joist | 4.62″ · $5.65/sq ftfits a 2 × 6 wall | +22% |
| R-38 | 10.86″ · $5.63/sq ft⚠️ deeper than any common framing | 5.85″ · $7.02/sq ftfits a 2 × 8 rafter or joist | +25% |
| R-49 | 14″ · $6.14/sq ft⚠️ deeper than any common framing | 7.54″ · $8.89/sq ftfits a 2 × 10 rafter or joist | +45% |
The premium grows with the target rather than staying at the sticker figure, and the second line of each cell is the part that usually decides it: open-cell runs out of cavity long before closed-cell does. Filled to the face, a 2 × 4 wall holds R-12.3 of open-cell and R-22.8 of closed-cell; a 2 × 6 holds R-19.3 and R-35.8. ⚠️ We do not print a code R-value for walls here on purpose: the figure the IRC asks for varies by climate zone and that text is not ours to copy or paraphrase. What the arithmetic can tell you is what physically fits, and in a 2 × 4 wall that rules one of the two products out of most of the country before price is even discussed.
| Line item | Qty | Cost | Source |
|---|---|---|---|
| Open-cell, half-pound spray foam, chemical delivered to sitesurface sq ft × inches sprayed | 3,500board ft | $910–$1,540 | estimated±26% |
| Spray crew: gun time at the surfaceboard-feet ÷ 1,000 × hours per thousand × where it is sprayed | 7hour | $321–$345 | sourced |
| Rig mobilisation: truck, hose, generator and fuel1 visit | 1each | $190–$460 | estimated±42% |
| Masking, sheeting and protecting everything nearby0.004 h per sq ft × where it is sprayed | 4hour | $183–$197 | sourced |
| Trim the open-cell flush with the framing and bag the offcut0.006 h per sq ft, open-cell in a cavity only | 6hour | $275–$296 | sourced |
| Total | $1,880–$2,838 | ±20% |
Where these numbers come from
- The board-foot, and why square feet cannot answer this
- Every other material on this site is bought by the square foot, and foam is not. A board-foot is one square foot at one inch, and the depth is half the quantity. The same thousand square feet is $1,767 at two inches of open-cell and $7,322 at six of closed-cell. Google shows “how much does it cost to spray foam for 1000 square feet” on this search, and it is a question with no answer attached — which is exactly why the answers people find online disagree by a factor of five. ⚠️ The practical version: when a quote gives a price per square foot, the missing number is inches, and it is the one that decides both what you pay and what R-value you end up with. Ask for it in writing.
- Open-cell against closed-cell, compared the honest way
- Closed-cell costs about 2.7 times what open-cell costs per board-foot, and that is the comparison the trade quotes. It is also the wrong one, because the two do not buy the same thing per inch: the EPA publishes R-6.5 per inch for closed-cell and R-3.5 for open-cell, so closed-cell reaches any given target in about 46% fewer inches. At the same R-value the premium is about a tenth at R-13 and about a quarter at R-38, not 2.7×. ⚠️ It is deliberately not quoted to the percentage point, because it is not a constant: material does not move with your metropolitan wage and hours do, so the premium is a couple of points different in Atlanta (10% at R-13) from the national figure in the table above. The table recalculates it for your ZIP code. ⚠️ And the thing that usually decides it is not price at all, it is depth: filled flush, a 2 × 4 wall holds R-12.3 of open-cell and R-22.8 of closed-cell; a 2 × 6 holds R-19.3 and R-35.8. We do not print the code R-value for walls here, deliberately — it varies by climate zone and that text belongs to the ICC, not to us — but the arithmetic above is enough to see that in a 2 × 4 wall one of the two products is out of the running in most of the country before anybody discusses money. Sources: EPA, Spray Polyurethane Foam Product Types (read 2026-08-25) for the R per inch and the densities, and ENERGY STAR, Recommended Home Insulation R-Values (read 2026-08-25) for what to aim at in an attic or a floor.
- The barrier the code wants over it, and the day you cannot go home
- Cured foam is a plastic, and the code does not let it sit exposed where people are: over it goes a thermal barrier, normally half-inch gypsum board, or where there will never be a finished surface, a sprayed ignition-barrier coating. On a thousand square feet that is the difference between $2,451 and $3,263 or $4,201, and it is routinely absent from a foam quote — which is one of the ways two quotes for the same wall differ by more than they appear to. ⚠️ On a gut remodel the gypsum is not an extra at all, because the wall was always going to be boarded; on a basement wall or a garage ceiling it very much is. The other line nobody quotes is not money: spraying is done with isocyanates, which OSHA lists for occupational asthma and respiratory irritation — OSHA, Isocyanates (read 2026-08-25) — and EPA, Vacate and Safe Re-Entry Time for Spray Polyurethane Foam Application (read 2026-08-25) says re-entry should wait until the product has cured and the building has been ventilated and cleaned, with 24 hours a figure some manufacturers recommend and one that varies by product. Ask for yours before the day rather than after.
- What this page does not price, on purpose
- Two of the commonest foam jobs are missing from the list of surfaces here, and it is a rule rather than an oversight: one job, one model, one number. Open-cell at an attic roof deck is priced on our attic insulation page — $27,431 for a 2,000 sq ft attic, including stripping out what is there now — and closed-cell on crawl space walls on our crawl space encapsulation page, where the foam is one line of a job that is mostly liner and sealing. Modelling either of them twice would give two numbers for one piece of work, and a reader who compared the pages would be right to stop trusting both. Labour here is official: wages from BLS OEWS for insulation workers, May 2025, retrieved 2026-08-20, benefit-loaded from BLS ECEC, with every estimated band on the dataset page and the whole approach on the method page.
- Material prices
- Modelled estimates, not sourced prices. No public, machine-readable source of US residential material prices exists, and we would rather say so than pretend otherwise. Each line carries its own uncertainty band. How we estimate them.
Contractor overhead and profit applied at 33–43% over direct cost. Data last reviewed 2026-08-25.
What this figure does not include
- Opening the wall or the ceiling up
- This page prices foam going into a cavity that is already open. Taking siding off, pulling plaster down or cutting a ceiling back is the job that comes first, and on a retrofit it is often larger than the insulation. ⚠️ It is also the reason foam is easy to specify in a new build and awkward in a finished house: high-pressure foam cannot be injected through a hole the way loose fill can.
- Putting the room back together
- Siding, plaster, paint and trim after the foam is in. The gypsum option on this page is the code barrier over the foam and nothing more: it is board, tape and compound, not a finished room.
- Attics and crawl spaces, which are priced whole elsewhere
- ⚠️ Deliberately not modelled here, and it is a rule rather than an omission: one job, one model, one number. Open-cell at the roof deck is priced on our attic insulation page and closed-cell on crawl space walls on our crawl space encapsulation page, both including the parts of those jobs that are not foam. Two models of the same work drift apart, and a reader who compared the pages would be right to stop trusting both.
- Staying somewhere else while it cures
- ⚠️ Not a line on any quote and it is a real cost. EPA guidance on the professional high-pressure system says some manufacturers recommend twenty-four hours before re-entry, that the recommended time varies, and that re-entry should wait until the product has cured and the building has been ventilated and cleaned. Ask your contractor for the figure for the specific product before the day, not after.
- What it saves on the energy bill
- No payback figure is published here, because an honest one needs your fuel price, your climate, how leaky the house is now and how you heat it. What this page can say is what the insulation costs and what R it buys, which is the half nobody gives you straight.
Questions people actually ask
How much does it cost to spray foam for 1000 square feet?
⚠️ It has no answer until somebody says how deep. Foam is sold by the board-foot — one square foot at one inch — so 1,000 square feet is $1,767 of open-cell at two inches and $7,322 of closed-cell at six, in Atlanta, from the same model. That is a factor of 4 across quotes that would all describe themselves as "1,000 square feet of spray foam". The table at the top of this page prices every depth, and the number to ask a contractor for is inches, because the R-value follows the inches and nothing else does.
How much does it cost to spray foam a 40x60 building?
About $14,141 in Atlanta at two inches of closed-cell, and $20,372 at three. ⚠️ The arithmetic the question leaves out is the surface: a 40 × 60 building with a 14-foot eave and a 4:12 roof is 2,800 sq ft of wall plus 2,530 of roof — 5,330 sq ft, not the 2,400 of the floor. Closed-cell is what goes on the underside of a steel skin, because half of what you are buying is stopping condensation dripping off cold metal onto whatever is below. Open-cell there is $14,397 for five inches and it is the wrong product: it lets moist air reach the steel and then holds what condenses.
How much would it cost to spray foam insulate a 2000 foot attic?
About $27,431, and that figure is not from this page — it is from our attic insulation model, which prices the whole job including stripping the old fill out. ⚠️ It is a large number and the reason is arithmetic, not markup: a roof deck over a 2,000 sq ft attic is about 2,400 sq ft of slope, and reaching a zone R-target with open-cell at R-3.5 an inch takes something like fourteen to seventeen inches of foam. If a quote for an unvented attic is a third of this, that is not a better price, it is less foam: ask how many inches it is for.
Is spray foam insulation worth the money?
No payback figure is published here, because an honest one needs your fuel price, your climate and how leaky the house is now — and every number you see online has quietly assumed all three. What this page can tell you is what it costs and what it buys. At the same R-value, closed-cell is about a tenth dearer than open-cell at R-13 and about a quarter at R-38, not the 2.7× its board-foot price suggests — and the table on this page recalculates it for your ZIP code, because the premium moves with your local wage. And foam does two things other insulation does not: it air-seals as it goes, and at two inches or more closed-cell is also a vapour retarder, so it can make an assembly that has no other solution — a cathedral ceiling with no room for a vent channel, a rim joist, the underside of a steel roof. ⚠️ Where a vented attic floor can simply take more loose fill, foam is usually the expensive way to buy the same R.
Taken from Google’s “people also ask” results for this search on 2026-08-25, not invented.
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