Key takeaways
- Typical cost: $1,700–$2,500 per attic, about $2,100 on average.
- Average project: about $2,100
- 1,000 sq ft attic: $1,000–$3,000
- Recommended: R30–R60 by climate zone
- Timeline: Blowing in insulation for a 1,000 sq ft attic can take a few hours; larger jobs take up to two days.
- Permits: Insulation rarely needs a permit, but local codes set minimum R-values.
Attic Insulation Cost at a glance
Attic insulation typically costs $1,700–$2,500, with an average around $2,100. Insulation type, attic size and removal of old material drive the price.
| Type / item | Typical cost (per sq ft installed) | Notes |
|---|---|---|
| Blown-in (fiberglass or cellulose) | $1–$4 | Fills gaps well |
| Batts or rolls | $2–$4 | DIY-friendly |
| Loose-fill | $2–$5 | |
| Spray foam | $2–$5 | Also air-seals |
| Radiant barrier | $0.50–$2 | Best in hot climates |
| Structural insulated panels | $4–$7 |
Prices run lowest in states like Arkansas, Mississippi and Alabama and highest in Hawaii, California and Alaska. See the full breakdown and cost by state →
Attic Insulation cost questions
- What is the cost of blown-in (fiberglass or cellulose)? The typical cost of blown-in (fiberglass or cellulose) is $1–$4 (typical cost per sq ft installed). Fills gaps well.
- What is the cost of batts or rolls? The typical cost of batts or rolls is $2–$4 (typical cost per sq ft installed). DIY-friendly.
- What is the cost of loose-fill? The typical cost of loose-fill is $2–$5 (typical cost per sq ft installed).
- What is the cost of spray foam? The typical cost of spray foam is $2–$5 (typical cost per sq ft installed). Also air-seals.
- What is the cost of radiant barrier? The typical cost of radiant barrier is $0.50–$2 (typical cost per sq ft installed). Best in hot climates.
- What is the cost of structural insulated panels? The typical cost of structural insulated panels is $4–$7 (typical cost per sq ft installed).
- What is the cost of old insulation removal? The typical cost of old insulation removal is $1–$1.50 (typical cost per sq ft installed). If wet, moldy or pest-damaged.
- What is the cost of air sealing? The typical cost of air sealing is $250–$750 per project (typical cost per sq ft installed). Often done first.
- What is the cost of 1,000 sq ft attic? The typical cost of 1,000 sq ft attic is $1,000–$3,000 total (typical cost per sq ft installed).
Signs you need more attic insulation
- Insulation sits below the top of the floor joists
- High heating or cooling bills
- Ice dams or large icicles in winter
- Uneven room temperatures or drafts
- Compacted, wet or animal-damaged insulation
Recommended R-values (ENERGY STAR)
| Climate zone | Uninsulated attic target |
|---|---|
| Zone 1 (hottest) | R30 |
| Zones 2–3 | R49 |
| Zones 4–8 | R60 |
Local building codes set minimum R-values, which may differ from ENERGY STAR's recommendations.
Blown-in vs. batts vs. spray foam
- Blown-in ($1–$4/sq ft) fills gaps around joists and wiring; best installed by a pro.
- Batts ($2–$4/sq ft) are DIY-friendly in open, accessible attics.
- Spray foam ($2–$5/sq ft) insulates and air-seals but needs professional installation.
Old gravel-like loose-fill insulation may contain asbestos. Have it tested before disturbing it.
Common attic insulation questions
How much does attic insulation cost?
Most attic insulation projects cost about $1,700–$2,500, or roughly $1–$3 per square foot of attic floor nationally.
How much attic insulation do I need?
ENERGY STAR recommends about R30 in the hottest climate zone, R49 in zones 2–3 and R60 in zones 4–8 for an uninsulated attic.
How much does it cost to remove old attic insulation?
Removal typically costs $1–$1.50 per square foot and is only needed if insulation is wet, moldy or pest-damaged.
Is spray foam attic insulation worth it?
Spray foam ($2–$5/sq ft) also air-seals, which can help efficiency, but blown-in or batts cost less for a simple top-up.
Timeline, permits and DIY
How long it takes
Blowing in insulation for a 1,000 sq ft attic can take a few hours; larger jobs take up to two days.
Permits
Insulation rarely needs a permit, but local codes set minimum R-values.
DIY or hire a pro?
Batts are DIY-friendly; blown-in and spray foam are best left to pros, and test old loose-fill for asbestos.
Questions to ask contractors
Ask every bidder the same questions so you can compare quotes apples to apples.
- What R-value will I have when you're done?
- Is air sealing included?
- How will you keep vents and soffits clear?
- Will you remove damaged insulation first?
Maintenance that prevents costly repairs
- Check insulation depth every few years
- Keep soffit vents clear
- Fix roof leaks fast to keep insulation dry
Frequently asked questions
How much attic insulation do I need?
ENERGY STAR recommends about R30 in the hottest zone, R49 in zones 2–3 and R60 in zones 4–8 for uninsulated attics.
How long does attic insulation take?
Blowing in insulation for a 1,000 sq ft attic can take a few hours; bigger jobs take up to two days.
Is there a federal tax credit for insulation?
Federal energy credits changed in 2025, so check current IRS guidance and look for utility or state rebates.
Blown-in or batts?
Costs are similar per sq ft. Blown-in fills gaps better and suits a pro install; batts suit DIY.
Can I insulate my attic myself?
Batts are DIY-friendly. Blown-in and spray foam are best left to professionals.
In-depth attic insulation guides
Attic Insulation by city
Sources: HomeAdvisor — Attic insulation cost · Bob Vila — Attic insulation cost · ENERGY STAR — Recommended home insulation R-values. Ranges are rounded estimates; see our editorial policy.