Spray Foam Insulation Cost 2026: $3,000–$5,000 Typical

Installing about 1,000 square feet of open-cell spray foam in a US house — the foam and the labor in one price, on the underside of an attic roof, at a common depth for that deck — often clusters around $3,000–$5,000. That is the typical spray foam insulation cost. How much does spray foam insulation cost in that scope? It is the open-cell part of the size row below, at $3–$5 a square foot, not the $7 top. The cost to install spray foam insulation, for that roof, is the same band. Spray foam insulation cost per square foot, installed, is typically $3–$7, and the typical band is the open-cell part of that rate on about 1,000 square feet. Open-cell spray foam cost is that $3–$5. Closed-cell spray foam cost is $4–$7 and replaces it. The wider national spread, about $500–$14,000, covers open-cell rim joists at the low end and about 2,000 square feet at $7 a square foot at the high end. Blown fill on a vented attic floor is the attic insulation guide. The liner that closes a crawl is the crawl space encapsulation guide. The shingles are the roof replacement guide. These are typical planning ranges, not a survey and not a quote.

This page is spray foam on an existing single-family house. A bid may call it spray foam insulation, foam on the roof deck, or an unvented attic. It is not cellulose or fiberglass blown onto a vented attic floor, which is the attic insulation guide. It is not the plastic and the sealed vents, which is the crawl space guide. It is not a tear-off and new shingles, which is the roof replacement guide. A kit from a home center, and foam stuffed into a single rim bay with a can, are different products.

The price of the job is the foam and the labor that sprays it. Square feet of the surface are the first cut. The foam and the depth are the second. A per-foot rate is a way to check a row. It is not a second bill. A board foot is one square foot, one inch thick. The inches on the bid times the board-foot rate are the square-foot price. Price the surface you can measure.

The rows below are ways to read one job. They are not added together. The size table is spray foam at $3–$7 a square foot, foam and labor included, at a common depth for that assembly. The foam table is that same installed surface, by which foam it is, and it replaces the generic rate. Open-cell is the typical foam on an attic roof deck. Closed-cell replaces open-cell. It is not a second layer on top of it. Use an add-on row only for a line the size row does not include. A removal the proposal already names is not a second removal. A crew minimum replaces a small product that landed under it. It is not a fee on top of a roof deck that already cleared $1,000.

Surface	Square feet	Typical installed cost
A small wall or a short roof	200	$600–$1,400
Crawl walls, or part of an attic	500	$1,500–$3,500
Attic roof deck	1,000	$3,000–$7,000
A larger roof deck	1,500	$4,500–$10,500
A large roof deck	2,000	$6,000–$14,000

Foam	Typical installed cost per square foot
Open-cell, attic roof deck	$3–$5
Closed-cell	$4–$7

Add-on	Typical planning range
Old insulation removal, when the bid leaves it out	$1–$2 per sq ft
Rim joists, open-cell, when they are their own visit	$500–$1,200
Rim joists, closed-cell, when they are their own visit	$800–$2,000
Crew minimum, when the square-foot product lands under it	$1,000–$2,000

The foam rows replace the generic rate inside the size row. Do not add closed-cell on top of a size row that was already priced as open-cell. The add-on rows are lines the size row left out, or a small visit the size row is not. A removal the proposal already includes is not the removal row on top. A minimum the square-foot product already cleared is not a second charge.

About 200 square feet — a small wall, or a short section of roof — is typically $600–$1,400. Two hundred times $3 is $600, the floor of the row and $100 above the wider floor of $500. Two hundred times $7 is $1,400, the top. Two hundred times $5 is $1,000, inside the row and under the typical band. Two hundred times $4 is $800, inside the row and under the typical band. The whole row sits under $3,000. A 200 square foot surface at the top of the rate is still a small area. It is not the typical band with a discount. A crew that will not roll a truck for that little foam can use the $1,000–$2,000 minimum instead of $600. The $1,000 point is inside this row. The $2,000 point has left this row by $600 and sits inside the 500 square foot row. The minimum replaces the square-foot product. It is not added on top of it. From $600–$1,400 the job is the 200 square foot row. Do not add the 1,000 square foot row on top of it.

About 500 square feet — crawl walls, or part of an attic roof — is typically $1,500–$3,500. Five hundred times $3 is $1,500, the floor. Five hundred times $7 is $3,500, the top, and that top is $500 past the typical floor. Five hundred times $5 is $2,500, inside the row and under the typical band. Five hundred times $4 is $2,000, inside the row and under the typical band. Open-cell on this area is $1,500–$2,500. Five hundred times $3 is $1,500. Five hundred times $5 is $2,500. The whole open-cell reading sits under the typical floor. Closed-cell on this area is $2,000–$3,500. Five hundred times $4 is $2,000. Five hundred times $7 is $3,500. The overlap of open-cell and closed-cell on 500 square feet is $2,000–$2,500. Ask which foam the bid is. From $1,500–$3,000 the job sits under the typical floor and stays inside the row. The $3,500 point has crossed the typical floor by $500 and is the top of this row. It is not the typical band. Do not add the 200 square foot row to this one.

About 1,000 square feet — an attic roof deck of that size — is typically $3,000–$7,000 on the size row, and the typical band of $3,000–$5,000 is that row from $3 to $5 a square foot. One thousand times $3 is $3,000, the floor of the row and the typical floor. One thousand times $5 is $5,000, the typical top. One thousand times $7 is $7,000, the top of the row and $2,000 past the typical band. The overlap of the size row with the typical band is $3,000–$5,000. From $5,000–$7,000 the job has left the typical band and stays inside the wider spread. This is the roof the typical band describes, at the open-cell rate, not at $7. Do not add a per-foot rate on top of this row. The per-foot reading is how the row was built.

About 1,500 square feet is typically $4,500–$10,500. Fifteen hundred times $3 is $4,500, the floor of the row and inside the typical band. Fifteen hundred times $5 is $7,500, which has left the typical band by $2,500 and stays inside the row. Fifteen hundred times $7 is $10,500, the top. The overlap with the typical band is $4,500–$5,000. The $5,000 point is also 1,000 square feet at $5. Ask which surface the bid is. From $5,000–$10,500 the job is at or above the typical top and stays inside the wider spread. Nothing in this row is 1,000 square feet someone enlarged and then charged twice for the trip. The truck is already there. Do not add the 1,000 square foot row to this one.

About 2,000 square feet is typically $6,000–$14,000. Two thousand times $3 is $6,000, the floor of the row and $1,000 past the typical top. Two thousand times $5 is $10,000, inside the row. Two thousand times $7 is $14,000, the top of the row and the top of the wider spread. Nothing in this row sits inside the typical band. The $6,000 floor is also 1,000 square feet at $6 and 1,500 square feet at $4. Ask which surface the bid is. From $6,000–$14,000 the job is above the typical top and stays inside the wider spread. Do not add the 1,500 square foot row to this one.

Spray foam insulation cost per square foot

Spray foam insulation cost per square foot is the installed surface, not the price of a board foot with no depth named. The size rows use $3–$7, foam and labor included, at a common depth. Open-cell is typically $0.50–$0.75 a board foot. Closed-cell is typically $1–$1.75 a board foot. A board foot is one square foot, one inch thick. Six inches of open-cell at $0.50 is $3 a square foot. Six times $0.50 is $3, the floor of the rate. Six inches at $0.75 is $4.50. Six times $0.75 is $4.50. Ten inches of open-cell at $0.50 is $5. Ten times $0.50 is $5, the top of the open-cell rate. Four inches of closed-cell at $1 is $4. Four times $1 is $4. Four inches at $1.75 is $7. Four times $1.75 is $7, the top of the rate. Use the board-foot line when the bid is written that way. Do not add those inches on top of a size row that already includes them.

On 1,000 square feet, open-cell at $3 is $3,000, the typical floor. Open-cell at $4.50 is $4,500, inside the typical band. One thousand times $4.50 is $4,500. Open-cell at $5 is $5,000, the typical top. Open-cell at $7 would be the closed-cell top, not this foam. Eight inches of open-cell at $0.75 is $6 a square foot. Eight times $0.75 is $6. One thousand square feet at $6 is $6,000, $1,000 past the typical band and $1,000 under the size-row top. Ten inches at $0.75 is $7.50. Ten times $0.75 is $7.50. One thousand square feet at $7.50 is $7,500, which has left the 1,000 square foot row by $500 and stays inside the 1,500 square foot row, under that row’s $10,500 top. A quote of $3 a foot on 1,000 square feet is the floor of the size row and the typical floor. It can be six inches of open-cell at $0.50 a board foot. It is not closed-cell with a discount.

Two inches of closed-cell at $1 a board foot is $2 a square foot. Two times $1 is $2. One thousand square feet at $2 is $2,000, which sits under the typical floor and under the 1,000 square foot row. That is a thin coat, not the common-depth row. Two inches at $1.75 is $3.50. Two times $1.75 is $3.50. One thousand square feet at $3.50 is $3,500, inside the typical band and inside the 1,000 square foot row. A thin coat and a common-depth roof can both be on the bid. Ask which depth it is. Do not add the two-inch price under a four-inch price for the same square feet.

Old insulation removal, when the bid leaves it out, is typically $1–$2 a square foot. One thousand times $1 is $1,000. One thousand times $2 is $2,000. On the typical band, the roof plus that removal is $4,000–$7,000. Three thousand plus $1,000 is $4,000. Five thousand plus $2,000 is $7,000. The floor stays inside the typical band. The top has left it by $2,000 and is the top of the 1,000 square foot row. Five hundred times $1 is $500. Five hundred times $2 is $1,000. A roof deck sprayed over fill the bid is leaving in place does not get this row. A removal the proposal already includes is not a second tear-out. Wet fill, and fill that may contain asbestos, are a different project. They are not this $1–$2.

Open-cell and closed-cell spray foam cost

Open-cell spray foam cost is this page when the foam is the softer foam and the surface is an attic roof deck. A bid that says open-cell and a bid that says spray foam are the same dollars when the square feet, the depth, and the labor match and both sit on the $3–$5 rate. The typical band, $3,000–$5,000, is about 1,000 square feet of that open-cell foam, installed. It is not a second product stacked on a size row you already have.

Closed-cell spray foam cost is the denser foam. It is typically $4–$7 a square foot and replaces the open-cell rate. About 4 inches at $1–$1.75 a board foot is that rate. Closed-cell takes less depth for a higher price per inch. It is not a second $3–$5 under an open-cell price.

On 1,000 square feet, open-cell at $3 is $3,000, the typical floor. Open-cell at $4 is $4,000, inside the typical band. Open-cell at $5 is $5,000, the typical top. The open-cell row on this roof is the typical band. An open-cell roof and a size-row roof can both land on $5,000. One thousand times $5 is $5,000. Ask which rate the bid used. Do not add the $3–$7 rate under an open-cell price.

On 1,000 square feet, closed-cell at $4 is $4,000, inside the typical band. Closed-cell at $5 is $5,000, the typical top. Closed-cell at $7 is $7,000, $2,000 past the typical band and the top of the size row. The overlap with the typical band is $4,000–$5,000. From $5,000–$7,000 the closed-cell job has left the typical band and stays inside the 1,000 square foot row. An open-cell roof and a closed-cell roof can both land on $5,000. One thousand times $5 is $5,000. Ask which foam the bid is. Do not add the open-cell rate under a closed-cell price.

On 500 square feet, open-cell at $3 is $1,500, the floor of that row. Five hundred times $5 is $2,500, inside that row and under the typical band. Closed-cell at $4 is $2,000. Five hundred times $7 is $3,500, the top of the 500 square foot row. An open-cell $2,500 and a closed-cell $2,500 are the same dollars and not the same foam. Five hundred times $5 is $2,500 either way. Do not add the open-cell 500 square foot row under a closed-cell price.

Rim joists, when they are their own visit and not part of the roof deck, are typically $500–$1,200 in open-cell and $800–$2,000 in closed-cell. The $500 floor is the floor of the wider spread. It is not 200 square feet at $3, which is $600. The overlap of the two rim-joist rows is $800–$1,200. Ask which foam the bid is. Closed-cell rim joists at $2,000 have left the 200 square foot row by $600 and sit inside the 500 square foot row. Do not add rim joists on top of a roof-deck price that already sprayed that wood. A crew minimum of $1,000–$2,000 can replace a rim-joist price that landed under the minimum. One thousand dollars is inside the open-cell rim-joist row. Two thousand dollars is the top of the closed-cell rim-joist row. The minimum replaces the smaller number. It is not a second line under it.

What the range includes

The typical band assumes about 1,000 square feet of open-cell spray foam at a single-family house, on the underside of the attic roof. The foam is in. The labor is in. The depth is a common depth for that deck, the depth that lands on $3–$5 a square foot. Masking and ordinary cleanup, in this band, are part of the labor the bid already names. An open 1,000 square feet at $3 a foot is the $3,000 floor. The same surface at $5 is the $5,000 top.

How long the work takes depends on the square feet, the depth, the masking, and the tear-out, and the bid’s schedule is the one that counts. These are not a day count on this page. The foam has to cure before the house is lived in the way the installer describes. That wait is not a dollar line.

The floor of the wider spread, near $500, is open-cell rim joists as their own visit. It is not 1,000 square feet someone discounted. The top, $14,000, is about 2,000 square feet at $7. Two thousand times $7 is $14,000. It is not the 1,000 square foot row plus every add-on. One thousand square feet of open-cell at $5,000, removal at $2,000, and rim joists the roof price left out at $1,200 is $8,200. Five thousand plus $2,000 is $7,000. Seven thousand plus $1,200 is $8,200. That sum has left the 1,000 square foot row by $1,200 and stays inside the 1,500 square foot row, under that row’s $10,500 top. Stacking those lines does not build the $14,000 job. The $14,000 job is the large roof at $7 a square foot. A whole house of closed-cell on more than 2,000 square feet can clear that top. Treat a number above it as more surface, or as a depth the $7 rate does not cover, and ask which one.

None of the bands include blown cellulose or fiberglass on a vented attic floor, which is the attic insulation guide, often $1,800–$4,000 for a common unfinished attic. They overlap this typical band from $3,000–$4,000. Three thousand dollars can be this open-cell roof at $3 a foot, or the top half of that blown-in band. Ask which assembly the bid is. Do not add $1,800 to $3,000. None of the bands include the liner and the sealed vents, which is the crawl space encapsulation guide, or a tear-off and new shingles, which is the roof replacement guide. A roof that leaks gets fixed before anyone sprays the deck. New windows are a separate envelope bid. Do not fold the blown fill, the liner, the shingles, or the windows into the foam price.

An ignition barrier or a thermal barrier, when the foam stays exposed to a living space and the bid leaves the coating or the drywall out, is its own line. This page does not put a dollar on that line. Ask the bid to name it. A coating the proposal already includes is not a second coating. Drywall that was already going back on is the barrier. It is not an extra product.

Warranties are part of the contract, and this page is not a reading of one company’s form. A spray-foam warranty commonly splits the foam and the installation, and the term on labor is often shorter than any term on the material. Foam that pulled off the deck, a depth that is short of what the bid named, and a stain from a roof leak the foam warranty excludes are questions for that form. Read it. The warranty is not a dollar line in the planning range.

Homeowners insurance and a home warranty are contracts too. A standard homeowners policy is built around sudden and accidental damage. Foam ruined by a covered fire is the kind of loss those policies sometimes respond to, and the replacement is part of that claim only to the extent the form says. Foam you chose to install, and a roof leak you left alone, are the kind of loss those policies commonly treat as maintenance. Read the form before you treat the policy as the budget. A home warranty may name the house and still exclude insulation. Neither contract is inside the planning range.

As a cross-check, not a bid: 1,000 square feet at $3–$5 is $3,000–$5,000, the typical band. One thousand times $3 is $3,000. One thousand times $5 is $5,000. Five hundred square feet at $3–$5 is $1,500–$2,500, open-cell, under that band. Two thousand square feet at $5 is $10,000, inside the wider spread and above the typical band. If a bid and that reading are far apart, the bid is a larger surface, closed-cell, a deeper coat, a tear-out, rim joists, a crew minimum on a small area, or a roof the crew has to reach through a scuttle.

What moves the price

Driver	How it changes the bid
Size	Two hundred square feet is $600–$1,400. About 500 square feet is $1,500–$3,500. About 1,000 square feet is $3,000–$7,000, and the typical band is the open-cell part of that row, $3,000–$5,000. About 1,500 square feet is $4,500–$10,500. About 2,000 square feet is $6,000–$14,000.
Foam	Open-cell is $3–$5 a square foot and is the typical band on about 1,000 square feet of roof deck. Closed-cell is $4–$7 and replaces the open-cell rate. The foam is not a second price on top of the size row.
Depth	Open-cell is typically $0.50–$0.75 a board foot. Six inches at $0.50 is $3 a square foot. Ten inches at $0.50 is $5. Closed-cell is typically $1–$1.75 a board foot. Four inches at $1 is $4. Four inches at $1.75 is $7. A line the bid already includes is not a second line.
Removal and rim joists	Both are outside the size row when the bid leaves them out. Removal is $1–$2 a square foot. Rim joists, as their own visit, are $500–$1,200 open-cell and $800–$2,000 closed-cell. A roof deck with the old fill already gone, and with the rim wood already in that spray, does not get those rows.
Crew minimum	A minimum of $1,000–$2,000 replaces a square-foot product that landed under it. A 1,000 square foot roof at $3,000 has already cleared it. Do not add the minimum on top.
Access	A walk-in attic is easier than a scuttle with no decking. Low pitch and tight trusses slow the crew. A high-cost metro can clear the top of the typical band on a straightforward 1,000 square feet.

Square feet are the first cut, and they are not a rate times the whole house if only the attic roof is in the bid. Measure the surface that gets foam. Roof-deck area is not the attic floor, and it is not the living area downstairs. A 200 square foot wall at $7 is $1,400. One thousand square feet at $3 is $3,000. The smaller, higher-rate surface can cost less than the larger, cheaper one, and the gap is the square feet. The crew does not scale in a straight line from a rim bay, which is why a real visit often does not land under $500.

The foam is the second cut, and it is a substitute, not a stack. Open-cell and closed-cell are ways to price one surface. Adding closed-cell on top of an open-cell size row is how 1,000 square feet becomes a number nobody can compare.

The same 1,000 square feet in a lower-cost area and in a high-labor city can sit at opposite ends of $3,000–$5,000 without either bid being wrong. Ask whether the old fill leaves, and ask whether the foam is open-cell or closed-cell. Blown attic insulation where the attic stays vented, a crawl space you are closing in the same season, and a roof that still leaks are the projects that show up beside this one. Price them on their own pages. Two bids that disagree about the foam, the depth, and whether the old fill is in are not the same job.

DIY or hire

Hire the closed-cell and any foam on a roof deck. The mix, the depth, and the roof assembly are the job. A weekend crew is most likely to miss the thickness and to bury a vent that should have stayed open, and a thin coat on a roof that still leaks shows up as a stain in the foam.

A retail kit is a different product. It is not the installed rate on this page, and it is not a 1,000 square foot roof deck. The installed row is the pro price. On 1,000 square feet, open-cell at $3–$5 is $3,000–$5,000. That is the labor and the foam together. A house, a closed-cell job, and any roof deck are a hire.

Do not skip the depth or the vents to save a day. If you are pricing a lift, a sprayer, and a roof that still needs a leak found, you are pricing a contractor’s job without the crew. Foam on the underside of the roof turns a vented attic into an unvented one. That is a different assembly from a thicker blanket on the attic floor, which is the attic insulation guide. The person who sprays it should say what happens to the ridge vent.

Repair or replace

Leave a sound foam job in place when it is stuck, dry, and as thick as the bid that put it there. A soft spot the size of a hatch can be more foam on those square feet. Price those feet as new foam. Do not add a whole-roof row for a hatch of foam. Twenty square feet at $3 is $60, under the wider floor of $500, because a spot that small is not the rim-joist visit. Twenty square feet at $7 is $140, still under that floor. Fifty square feet at $7 is $350, still under that floor. One hundred square feet at $7 is $700, inside the wider spread and inside the 200 square foot row. If the repair quote for those feet has reached the installed row for the same feet, price a replacement of those feet instead of a patch that costs the same.

Replace the foam when it has pulled off the deck, or when the depth is short of what the rooms need and the rest of the coat cannot simply be built up. Spray foam on a roof deck is not a top-off of loose fill. A new inch is not a repair of foam that let go. Leaving a pulled-off coat to save the $3,000–$5,000 is how the next bid is a replacement anyway, after a second trip.

A vented attic whose fill is dry and simply thin is the attic insulation guide, not a roof-deck spray. A damp crawl that needs a liner and sealed vents is the crawl space encapsulation guide. A roof that leaks is the roof replacement guide, and the deck gets sprayed after that roof is dry. Board that closes a room after the foam is in is the drywall guide. If the same season includes any of those, they are separate scopes. Do not fold them into the foam price.

How long a new coat lasts is not a number on this page. A patched bay is not a warranty that the rest of the foam will stay stuck. A replacement is not a warranty that a leak will miss the deck. The bid’s scope is the work you bought.

How to use this number

Ask two or three installers for a written price that names the square feet, whether the foam is open-cell or closed-cell, the depth or the board feet, whether the foam and the labor are both included, whether the old insulation is removed, whether rim joists are in, and what happens if the foam stays exposed to a room. Compare about 1,000 square feet of open-cell spray foam, installed, with $3,000–$5,000. Compare the surfaces with $600–$1,400 for 200 square feet, $1,500–$3,500 for 500, $3,000–$7,000 for 1,000, $4,500–$10,500 for 1,500, and $6,000–$14,000 for 2,000. Compare the foam with $3–$5 for open-cell and $4–$7 for closed-cell. Keep the foam and the labor inside those rows. Put a left-out removal at $1–$2 a square foot, and left-out rim joists at $500–$1,200 open-cell or $800–$2,000 closed-cell, on their own lines.

A very low bid on 1,000 square feet is a reason to ask whether the labor and the foam are both included, not a reason to celebrate. A quote near $500 should say rim joists, not an attic roof. A high bid should point at square feet, closed-cell, a deeper coat, a tear-out, access, or the labor market. Two or three local bids on the same surface, the same foam, and the same depth are the number that matters. How this site sets the band is explained on the methodology page.