Spray Foam Insulation Cost Calculator
Closed or open-cell foam from square footage, target depth, attic vs wall cavity work, and regional installer rates.
Your project
Area to insulate (sq ft)
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Area
Use net area of surfaces receiving foam — attic floor or wall cavity faces. |
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Foam type
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Foam
Closed-cell adds R-value per inch and costs more than open-cell. |
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Target depth
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Depth
Thicker lifts increase material and pass time. |
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Application zone
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Zone
Roofline foams are harder access than open attic floors. |
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Your state
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Your state
Scales midpoints for typical state-level labor and material costs versus the U.S. average. Not a local contractor bid. |
How to use this calculator
- Enter square footage receiving foam.
- Pick foam type, depth, and application zone.
- Choose your state.
Results explained
Rates are material + labor per sq ft at the depth tier — ventilation and ignition barrier codes may add cost onsite.
Quick reference: spray foam
| Open-cell 3 in | Per sq ft |
|---|---|
| Attic floor baseline | $1.65 |
| Closed-cell baseline | $2.85 |
| Roofline access add-on | +$0.62 |
How the estimate is built
(Foam type rate + depth add-on + zone add-on) × area, state scaled.
Example scenario
1,200 sq ft open-cell at 5 in on an attic floor ≈ $2,640 at U.S. average.
FAQ
Remove old insulation first?
Not modeled — vacuuming blown-in before foam adds labor.
Hybrid with batts?
Flash-and-batt assemblies differ — this is full foam only.
Off-gassing / re-entry?
Follow manufacturer re-occupancy times — not a cost line here.