Spray Foam Attic Insulation Cost in DFW (2026 Pricing)

The Answer: Expect $1.50 to $4.00 per Square Foot Installed

Trying to pin down spray foam attic insulation cost in DFW is frustrating, because every quote you get uses a different scope. Here's the honest starting point. Spray foam attic insulation runs about $1.50 to $2.20 per square foot for open cell and $2.50 to $4.00 per square foot for closed cell, installed. For a typical 1,500-square-foot attic, that lands at roughly $2,300 to $3,300 for open cell and $3,500 to $6,000 for closed cell. Those numbers include materials and labor.

Here's the part that catches people off guard. Spray foam is priced per square foot, and the total scales directly with attic size. A bigger attic isn't a discount — it's a bigger bill. That's why the type of foam you choose matters more than almost anything else.

Open Cell vs Closed Cell Pricing

Open-cell spray foam gives you R-3.5 to R-4.0 per inch at $1.50 to $2.20 per square foot. Closed cell gives you R-6.0 to R-6.5 per inch at $2.50 to $4.00 per square foot. Because closed cell is nearly twice the R-value per inch, you need less of it. But the higher per-foot price still makes closed cell the more expensive job overall.

To hit the R-38 minimum DFW's climate zone 3 needs, you'd use about two inches of closed cell or roughly four inches of open cell. On the same attic, that closed-cell job runs about a third to a half again the open-cell price.

What Actually Drives the Final Quote

Four things move the number. The size of the attic, square for square. The foam type — open or closed. Whether you're spraying the floor or the roof deck, which changes how much foam you need. And the state of the attic. If we have to air seal first, fix critter damage, or clear old insulation, that adds labor before the first can of foam goes down.

Roof Deck vs Attic Floor Pricing

Spraying the roof deck runs higher than the floor because you cover the whole roof plane, not a flat floor. On a 1,500-square-foot roof deck, closed-cell spray foam runs $3,500 to $6,000. That's the move for an attic conversion. A floor job to the same R-38 runs less because the square footage is smaller and open cell often works.

How Spray Foam Cost Compares to Blown-In

Here's the number that matters for most DFW homeowners. Blown-in fiberglass to R-38 on a 1,500-square-foot floor runs about $1,300 to $2,200. That's roughly half the price of open-cell spray foam and a third of closed cell. Spray foam's premium buys you air-sealing — the foam blocks leaks while it insulates. If your attic's air leaks are the real problem, the built-in seal is worth money. If not, blown-in plus a separate air sealing pass can do it for less.

The Rebate You Shouldn't Skip

Oncor still offers attic insulation rebates in the DFW area on eligible upgrades. It's worth checking current terms before you book, because a qualified spray-foam or blown-in job can shave a few hundred off the bill. The rebate is contingent on hitting the R-value target and proper installation, so getting it right matters for more than just comfort.

The Payback Question Nobody Prices Into the Quote

The real cost of spray foam isn't the invoice — it's the payback. ENERGY STAR frames attic insulation as one of the highest-return home improvements you can make, and the Department of Energy publishes the R-value target against which that payback is measured. In DFW, a properly insulated attic drops summer bills. If spray foam's air-sealing shaves $60 a month off a $400 summer bill, that's $720 a year, and a $5,000 closed-cell job pays back in about seven years — before the fiberglass alternative would have needed replacing. That math is why I always run the payback alongside the quote. The cheap option only looks cheap if you ignore the timeline.

What the $2,300-to-$6,000 Actually Covers

That range covers prep, materials, labor, and cleanup — but only if the quote is written that way. Some quotes stop short: surface prep, tear-out of old insulation, baffles, and air-sealing penetrations can all land as add-ons. When I compare jobs for homeowners, I compare the line items, not the total. A $2,500 quote that excludes tear-out and air sealing is frequently more expensive than a $3,200 quote that includes them. Ask for the scope in writing before you compare numbers, and you'll stop being surprised.

What to Ask Before You Pay for Spray Foam

Ask three things. Is the quote per square foot, and does it include air sealing and cleanup? What R-value are they guaranteeing, and what thickness of foam gets you there? And what happens if they find moisture or critter damage once they start — is that in the quote or a change order? A straight answer on those three is worth more than a low number.

Frequently Asked Questions

Call me, Neal, at (469) 895-2695 to get a real number for your DFW attic. I'll quote you the full scope — foam type, square footage, and any prep work — so you know exactly what you're paying for.