Cost to Spray Foam Insulation in San Antonio, TX (2026)
If you’re budgeting a spray foam insulation in San Antonio, most projects run $1,401-$6,073, 7% below the $3,500 national average. What moves that number most is usually one thing: Open-Cell vs. Closed-Cell. On its own it can swing the cost by $1,000 - $4,000, so that’s the decision to slow down on before you sweat the smaller stuff.
Easiest place to save: Use a hybrid approach - 2 inches of closed-cell for the air/vapor barrier, then cheap blown-in fiberglass to reach your target R-value. This saves 30-40% over full closed-cell.
In the Southeast (where San Antonio sits): Open-cell foam is often sufficient. Lower labor costs and moderate R-value requirements.
$1,401-$6,073 in San Antonio
7% below the national average · 0.93x cost multiplier
Expect to pay $1,401-$6,073 for a spray foam insulation in San Antonio, about 7% below the national benchmark. The Southeast region's contractor market and material costs account for most of this difference. The detailed breakdown below shows how budget, mid-range, and premium projects compare at San Antonio prices.
Cost Breakdown in San Antonio
| Line Item | Low | Mid | High |
|---|---|---|---|
| Cost per sq ft | $1 | $3 | $5 |
| Materials | $756 | $1,607 | $3,024 |
| Labor | $548 | $1,187 | $1,827 |
| Permits | $47 | $95 | $189 |
| Design | $47 | $378 | $1,040 |
| Total | $1,398-7% vs. national avg | $3,267-7% vs. national avg | $6,080-6% vs. national avg |
Budget
Open-cell spray foam in an open attic floor or crawl space, 500-800 sq ft, 3-4 inches of coverage (R-13)
Mid-Range
Closed-cell spray foam on attic roof deck or basement walls, 800-1,200 sq ft, 2-3 inches of coverage (R-13 to R-19)
Premium
Full closed-cell spray foam application on roof deck and walls, 1,200-1,500 sq ft, 4+ inches (R-26+), with thermal imaging verification
Material Options
Material prices below are national averages; availability in San Antonio may shift costs slightly.
| Material | Cost/Unit | Best For |
|---|---|---|
| Open-Cell Spray Foam (0.5 lb density) | $1.00 - $1.75 per sq ft per inch | Interior walls for soundproofing, attic roof deck in warm climates, above-grade applicationsLower cost, excellent air sealing, good soundproofing, expands to fill irregular cavities |
| Closed-Cell Spray Foam (2.0 lb density) | $1.75 - $3.50 per sq ft per inch | Basement walls, crawl spaces, attic roof deck in cold climates, thin wall cavities where space is limitedHighest R-value per inch, vapor barrier, adds structural rigidity, moisture resistant |
| DIY Spray Foam Kits | $1.50 - $2.50 per sq ft | Rim joists, small gaps, band boards, supplemental insulation under 200 sq ftNo contractor needed, available at home improvement stores, good for small jobs |
| Hybrid System (Closed-Cell + Blown-In) | $1.50 - $2.50 per sq ft (blended rate) | Attic roof decks and walls where you want closed-cell benefits at a lower total cost2 inches of closed-cell for air/vapor barrier, then cheaper blown-in to reach target R-value |
| Low-GWP Spray Foam (HFO-blown) | $2.00 - $4.00 per sq ft per inch | Green building projects, LEED certification, homeowners prioritizing environmental impact99% lower global warming potential than traditional HFC-blown foam, meets green building standards |
Other Projects in San Antonio
San Antonio Estimate
Typical Range
$1,401-$6,073
vs. National Average
7% below national
Cost Multiplier
0.93x
Cost Per sq ft
$1-$5
This 0.93x estimate prices San Antonio labor from BLS Occupational Employment and Wage Statistics (May 2025) and applies a lighter regional adjustment to materials and permits, which vary less by metro than labor does. Actual bids vary by contractor, project scope, and timing.
See national average costs →