Homeowners typically see a wide cost spread between spray foam and blown-in insulation. Main cost drivers include attic or wall area, insulation type, desired R-value, mixing/installation time, and regional labor rates. The following sections present clear cost ranges and practical budgeting guidance for U.S. buyers seeking a price or cost estimate.
Cost and pricing vary by region, material choice, and project scope. The figures below assume typical attic or non-structural wall applications with standard access and no major remodeling.
| Item | Low | Average | High | Notes |
|---|---|---|---|---|
| Spray Foam (Open-Cell, 3.5–3.6 pcf, unattached) | $0.90 | $1.25 | $1.75 | Per board foot; includes installation in attic spaces; typical R-3.5–R-4.0 per inch |
| Spray Foam Installed Cost (Attic, 800–1,500 sq ft) | $6,300 | $9,800 | $15,000 | Assumes 3–6 inch depth; varies by access and air-sealing needs |
| Closed-Cell Spray Foam Installed (per sq ft) | $1.50 | $2.50 | $3.50 | Higher R-value; common in retrofit and foundation walls |
| Blown-In Insulation (Fiberglass or Cellulose) | $0.50 | $0.80 | $1.20 | Per sq ft; commonly installed in attic or cavities |
| Blown-In Installed Cost (Attic, 800–1,500 sq ft) | $1,000 | $2,000 | $3,500 | Fiberglass or cellulose; includes blower equipment and bags |
| Labor & Permits | $200 | $750 | $2,000 | Depends on complexity and region; permits may apply in some locales |
| Delivery/Disposal | $50 | $150 | $400 | Materials transport and waste handling |
Overview Of Costs
Cost ranges for both methods reflect material type, area to treat, and installation complexity. For attic spaces, typical total project costs fall in the following bands: spray foam often lands in the $6,000–$15,000 range, while blown-in insulation generally runs $1,000–$3,500 depending on area and material. Per-unit pricing helps compare options: spray foam commonly $1.00–$3.00 per sq ft for open-cell and $1.50–$3.50 for closed-cell, with blown-in around $0.50–$1.20 per sq ft. Assumptions: region, specs, labor hours.
Cost Breakdown
| Category | Materials | Labor | Equipment | Permits | Delivery/Disposal | Warranty | Overhead | Contingency | Taxes |
|---|---|---|---|---|---|---|---|---|---|
| Spray Foam (Open-Cell) | $0.90–$1.25 / sq ft | $0.30–$0.70 / sq ft | $0.10–$0.25 / sq ft | — | $0.05–$0.15 / sq ft | 10–25 years | $0.05–$0.15 / sq ft | 5–15% | 0–8% |
| Spray Foam (Closed-Cell) | $1.50–$2.50 / sq ft | $0.50–$1.00 / sq ft | $0.15–$0.40 / sq ft | — | $0.10–$0.25 / sq ft | 15–25 years | $0.05–$0.15 / sq ft | 7–12% | 0–8% |
| Blown-In Insulation | $0.50–$0.80 / sq ft | $0.20–$0.60 / sq ft | $0.05–$0.15 / sq ft | — | $0.05–$0.15 / sq ft | Lifetime to 25 years | $0.02–$0.10 / sq ft | 5–12% | 0–8% |
Formula: labor_hours × hourly_rate
What Drives Price
R-value targets significantly shape costs. Open-cell foam typically adds R-3.5 to R-4 per inch, while closed-cell adds about R-6.5 per inch, influencing required thickness and material volume. For blown-in, achieving R-38 to R-60 in an attic often dictates material choice and depth. Attic access and ceiling height also affect installation time and waste handling. Assumptions: standard attic access, mid-range climate zone, typical two-story home.
Ways To Save
Pre-inspection and air sealing can reduce required insulation depth and avoid redundant layers. Combining services (air sealing with insulation) often lowers overall costs by reducing labor time. Scheduling during off-peak seasons in regions with higher contractor demand may yield savings of 5–15%.
Regional Price Differences
Regional variations affect both material availability and labor rates. In the Northeast, installed costs for open-cell spray foam may run 5–12% higher than the national average due to labor rates and code considerations, while the Midwest often sees mid-range pricing. In the Southeast, cellulose blown-in insulation can be more affordable due to material availability and lower labor hours.
Labor & Installation Time
Install time differs by material: spray foam requires equipment setup and curing time, often extending two crew days for large spaces; blown-in typically completes faster in attics with accessible access plenums. Expect labor costs to reflect crew size (1–2 days for large jobs) and travel time; more complex homes may add 10–25% to labor.
Additional & Hidden Costs
Hidden costs may include air sealing gaps, vapor barrier adjustments, or needing to retrofit existing framing for proper insulation, plus potential remediation if moisture issues are found. Some jurisdictions require permits for spray foam installations, and waste disposal fees apply to oversized materials.
Real-World Pricing Examples
Basic scenario: Attic area 800 sq ft, open-cell spray foam, standard access, no major gaps. Total around $6,300–$9,800, ~ $7.50–$12.25 per sq ft including labor.
Mid-Range scenario: Attic 1,200 sq ft, cellulose blown-in, air sealing added, typical climate zone. Total around $2,000–$3,500, ~ $0.70–$1.10 per sq ft.
Premium scenario: Walls plus attic, closed-cell spray foam, 1,600 sq ft, complex framing, high-perm vapor barriers. Total around $12,000–$18,000, ~ $7.50–$11.25 per sq ft for large scale work.