Spray Insulation vs Fiberglass Cost 2026

Homeowners typically pay a broad range when comparing spray insulation to fiberglass. The main cost drivers are material type, installation method, attic or wall area, and desired R-value. This article outlines cost expectations, including a clear low–average–high range, to help set a budgeting plan.

Item	Low	Average	High	Notes
Assumptions	Assumptions: region, house type, wall/attic area, and desired R-value
Surface Type	$1.50 per sq ft (fiberglass batt installed)	$2.00 per sq ft (fiberglass batt installed)	$3.50 per sq ft (fiberglass batt plus air sealing)	Per sq ft pricing varies by region
Material (Fiberglass)	$0.50–$0.75 / sq ft	$0.75–$1.25 / sq ft	$1.25–$2.00 / sq ft	Batts or rolls, R-values 13–38
Material (Spray Foam)	$1.20–$2.00 / sq ft (open-cell)	$2.00–$3.50 / sq ft (open-cell)	$3.50–$7.00 / sq ft (closed-cell)	Open-cell vs closed-cell drives large price differences
Labor & Installation	$0.60–$1.50 / sq ft (fiberglass)	$1.00–$2.50 / sq ft (fiberglass)	$2.50–$5.50 / sq ft (spray foam)	Spray foam requires skilled crew and longer cure times
Additional & Hidden Costs	$0.20–$0.50 / sq ft (sealing, misc.)	$0.40–$1.00 / sq ft	$0.80–$2.50 / sq ft	Air sealing, moisture barriers, vents
Total Installed (2,000 sq ft)	$3,000–$5,000	$4,000–$8,000	$9,000–$28,000	Open-cell spray foam on 2,000 sq ft attic commonly ~$4–$6 per sq ft

Overview Of Costs

Understanding price ranges helps buyers compare insulation options by total project cost and per-square-foot pricing. For a typical 2,000-square-foot home, fiberglass batt installation often lands in the $3,000 to $8,000 range depending on attic vs walls and R-value goals. Spray foam can range from around $4,000 to $28,000, with open-cell installations usually on the lower end and closed-cell systems on the higher end. The per-square-foot spread reflects material type, air-sealing needs, and labor intensity.

Cost Breakdown

Material choices and labor demand are the largest levers for price. A side-by-side breakdown shows fiberglass as predominantly material-driven, with modest labor costs, while spray foam blends material with specialized installation, equipment, and longer crew hours. The following table summarizes typical cost components for both methods.

Component	Fiberglass (Low)	Fiberglass (Average)	Fiberglass (High)	Spray Foam (Low)	Spray Foam (Average)	Spray Foam (High)
Materials	$0.50 / sq ft	$0.75 / sq ft	$2.00 / sq ft	$1.20 / sq ft	$2.50 / sq ft	$7.00 / sq ft
Labor	$0.60 / sq ft	$1.25 / sq ft	$2.50 / sq ft	$1.50 / sq ft	$3.50 / sq ft	$5.50 / sq ft
Equipment	$0.05 / sq ft	$0.10 / sq ft	$0.20 / sq ft	$0.10 / sq ft	$0.30 / sq ft	$0.60 / sq ft
Permits	$0.00–$0.10 / sq ft	$0.00–$0.15 / sq ft	$0.05–$0.25 / sq ft	$0.00–$0.05 / sq ft	$0.01–$0.10 / sq ft	$0.05–$0.25 / sq ft
Delivery/Disposal	$0.02–$0.05 / sq ft	$0.03–$0.08 / sq ft	$0.05–$0.20 / sq ft	$0.01–$0.04 / sq ft	$0.02–$0.08 / sq ft	$0.05–$0.15 / sq ft
Warranty	$0.01–$0.05 / sq ft	$0.02–$0.08 / sq ft	$0.05–$0.20 / sq ft	$0.01–$0.05 / sq ft	$0.02–$0.10 / sq ft	$0.05–$0.25 / sq ft
Estimated Total (2,000 sq ft)	$3,000–$5,000	$4,000–$6,000	$8,000–$14,000	$4,000–$8,000	$6,000–$12,000	$14,000–$28,000

Cost Drivers

R-value targets, surface type, and area geometry drive price gaps. Fiberglass costs stay closer to per-square-foot inclusions, but attic conversion, cathedral ceilings, or dense wall layouts can raise installation time and waste. Spray foam price hinges on open-cell vs closed-cell choice; closed-cell delivers higher R-value per inch but uses more material and requires specialized equipment. Attic ventilation, moisture considerations, and existing insulation condition also affect overall cost and performance.

Factors That Affect Price

Key price influencers include region, labor rates, and current material costs. Regional labor markets can push installed fiberglass or foam costs by 10–20% between Coastal, Inland, and Mountain zones. Local building codes and permit fees may add minor line items. Flight-time travel charges for crews and site access (tight spaces, crawlspaces) can add hours and cost. Seasonal demand also shifts pricing, with late summer and early fall commonly busier and pricier.

Ways To Save

Shop around for quotes and consider hybrid approaches. Getting multiple estimates helps capture regional variance. If budget is tight, fiberglass with upgraded batts and a sealant retrofits around penetrations may reduce costs. For high-performance needs, open-cell spray foam on the attic plus traditional fiberglass in walls can balance price and performance. DIY attic sealing and air sealing before insulation can cut overall labor time and improve results.

Regional Price Differences

Prices can vary by region and market conditions. In the Northeast, installed fiberglass might cluster around $3.50–$6.50 per sq ft for walls and $0.40–$0.60 per sq ft for attic sealing, while the Southeast often shows fiberglass at $2.50–$5.50 per sq ft. The West Coast tends to be higher overall due to labor and permitting, with spray foam commonly priced at $4.00–$7.50 per sq ft open-cell and $6.50–$12.00 per sq ft closed-cell. Rural markets may offer lower labor rates but higher travel charges, while urban markets show tighter scheduling and premium quotes.

Real-World Pricing Examples

Three scenario snapshots illustrate common project scales.

Assumptions: 2,000 sq ft home, attic + walls, mid-range R-values, typical climate zone.

1. Basic Fiberglass in walls and attic, no air sealing upgrades: Materials $1,000–$1,500; Labor $2,000–$3,000; Total $3,000–$4,800.
2. Mid-Range Fiberglass with attic air sealing and moisture barrier: Materials $1,500–$2,500; Labor $2,500–$3,800; Total $4,000–$6,300.
3. Premium Open-cell spray foam in attic plus fiberglass in walls: Materials $2,500–$4,000; Labor $2,800–$5,000; Total $5,300–$9,000.

Assumptions: region, specs, labor hours.