Attic insulation costs $1,500–$3,500 for a typical US home, depending on the insulation type, R-value target, and attic size. Blown-in cellulose or fiberglass is the most cost-effective option at $1–$2 per square foot installed, while spray foam runs $3–$7 per square foot. The Department of Energy estimates that proper attic insulation can reduce heating and cooling costs by 10–50%.
Attic insulation costs $1,500–$3,500 for a typical US home, depending on the insulation type, R-value target, and attic size. Blown-in cellulose or fiberglass is the most cost-effective option at $1–$2 per square foot installed, while spray foam runs $3–$7 per square foot. The Department of Energy estimates that proper attic insulation can reduce heating and cooling costs by 10–50%.
Average attic insulation costs by type
| Insulation type | Cost per sq ft (USD) | Best for |
|---|---|---|
| Blown-in fiberglass | $1.00–$1.50 | Open attics, topping up existing |
| Blown-in cellulose | $1.00–$1.80 | Open attics, eco-friendly option |
| Fiberglass batts | $0.80–$1.50 | New construction, accessible joists |
| Open-cell spray foam | $1.50–$3.00 | Cathedral ceilings, air sealing |
| Closed-cell spray foam | $3.00–$7.00 | Moisture barrier, structural strength |
| Mineral wool batts | $1.50–$3.00 | Fire resistance, soundproofing |
Sources: DOE insulation recommendations, HomeAdvisor 2025 pricing, NAIMA industry data.
What affects the cost?
- Insulation type — blown-in is cheapest; spray foam costs 3–5x more but provides air sealing
- R-value target — the DOE recommends R-38 to R-60 for attics depending on climate zone
- Attic accessibility — tight spaces, low clearance, and obstacles increase labor time
- Existing insulation — removal of old, damaged, or contaminated insulation adds $1–$2/sq ft
- Air sealing — sealing gaps around wires, pipes, and fixtures before insulating adds $500–$1,500
- Attic size — typical US attic is 1,000–1,500 sq ft
Attic insulation costs in the United States
For a 1,200 sq ft attic, blown-in insulation to R-49 costs $1,500–$2,500 installed. Spray foam for the same space runs $4,000–$8,500. Many utility companies offer rebates of $200–$1,000 for insulation upgrades, and the federal Inflation Reduction Act provides a 30% tax credit (up to $1,200/year) for insulation improvements through 2032.
The DOE recommends R-38 for mild climates (zones 1–3) and R-60 for cold climates (zones 5–8). DIY blown-in insulation is feasible — big-box stores loan blower machines with a minimum purchase of insulation material ($500–$800 for a typical attic).
Attic insulation costs in Poland
In Poland, attic insulation (ocieplenie poddasza) costs PLN 40–120 per m² installed, depending on material and thickness. Mineral wool (wełna mineralna) at 20–30 cm thickness is the standard choice, costing PLN 40–80/m² installed. PUR spray foam costs PLN 80–200/m². Polish building regulations require a U-value of 0.15 W/(m²·K) for roofs in new construction, equivalent to roughly 25–30 cm of mineral wool.
The "Czyste Powietrze" program offers subsidies of PLN 10,000–37,000 for thermal modernization including attic insulation, depending on income level. Most Polish homes built before 2000 have insufficient attic insulation and benefit significantly from upgrades.
Attic insulation costs in the Netherlands
Dutch attic insulation (dakisolatie) costs €25–€80 per m² installed. PIR/PUR boards are the most popular choice at €30–€60/m², while blown-in mineral wool costs €25–€45/m². The Netherlands targets an energy label of A or higher for all homes by 2030, making insulation a priority. The national ISDE subsidy provides €5–€14 per m² for roof insulation.
Most Dutch rowhouses (rijtjeshuizen) have relatively small roof areas (30–60 m²), keeping total costs in the €1,000–€4,000 range. The HR++ (high-performance) building standard requires an Rc-value of 6.3 m²·K/W for roofs in new construction.
Attic insulation costs in Spain
Spanish attic insulation costs €15–€50 per m² installed. EPS/XPS rigid boards are the most common choice at €20–€40/m², while spray polyurethane costs €30–€60/m². Spain's CTE (Código Técnico de la Edificación) sets thermal transmittance limits that vary by climate zone — from U=0.50 in warm coastal areas to U=0.23 in cold mountain zones.
Subsidies through the PREE (Programa de Rehabilitación Energética) and Next Generation EU funds cover 40–80% of insulation costs depending on the energy improvement achieved. Summer cooling savings are often more significant than winter heating savings in much of Spain.
How to save on attic insulation
- Claim available rebates — utility rebates, federal tax credits, and state programs can cover 30–50% of costs
- Start with air sealing — sealing gaps before adding insulation maximizes energy savings
- Choose blown-in for open attics — it's the most cost-effective option for standard attics
- Top up existing insulation — adding blown-in over old batts is cheaper than full removal and replacement
- DIY blown-in — renting a blower and buying material can cut costs by 50% for accessible attics
What affects the cost?
- Insulation type — blown-in is cheapest; spray foam costs 3–5x more but provides air sealing
- R-value target — the DOE recommends R-38 to R-60 for attics depending on climate zone
- Attic accessibility — tight spaces, low clearance, and obstacles increase labor time
- Attic size — typical US attic is 1,000–1,500 sq ft
How to save on attic insulation
- Claim available rebates — utility rebates, federal tax credits, and state programs can cover 30–50% of costs
- Start with air sealing — sealing gaps before adding insulation maximizes energy savings
- Choose blown-in for open attics — it's the most cost-effective option for standard attics
- Top up existing insulation — adding blown-in over old batts is cheaper than full removal and replacement
- DIY blown-in — renting a blower and buying material can cut costs by 50% for accessible attics