Attic Insulation

Blown-in vs. batt attic insulation: which is better?

Updated 2026-10-19 · Reviewed by the HomeServiceBud Editorial Team

Short answer

Blown-in and batt insulation cost about the same per square foot: blown-in runs $1–$4 and batts $2–$4 installed. Blown-in fills gaps around joists, wiring and obstructions better and suits professional installation, while batts are easier for DIY in open, accessible attics.

Key takeaways

  • Short answer: Blown-in and batt insulation cost about the same per square foot: blown-in runs $1–$4 and batts $2–$4 installed.
  • Blown-in: $1–$4 per sq ft
  • Batts: $2–$4 per sq ft
  • Blown-in fills gaps better
  • Typical attic insulation cost: $1,700–$2,500 per attic.

Side-by-side

Blown-inBatts
Installed cost per sq ft$1–$4$2–$4
Coverage around obstructionsExcellentHarder to fit
DIY-friendlyMachine requiredYes
Best forTopping up existing insulationOpen, unfinished attics

How much do you need?

ENERGY STAR recommends about R30 in the hottest climate zone, R49 in zones 2–3 and R60 in zones 4–8 for uninsulated attics. Blown-in insulation makes it easy to reach these depths over existing insulation.

Related questions

Can I put blown-in over batts?

Yes. Blowing loose-fill over existing dry batts is a common, cost-effective way to raise the R-value.

Cellulose or fiberglass blown-in?

Both work. Cellulose often costs a bit less; fiberglass resists moisture and settling better. Price and installer preference usually decide.

How much does it cost to insulate a 1,000 sq ft attic?

About $1,000–$3,000.

Other attic insulation questions homeowners ask

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.

Attic Insulation at a glance

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.

DIY or pro?

Batts are DIY-friendly; blown-in and spray foam are best left to pros, and test old loose-fill for asbestos.

What attic insulation costs

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.

See the full attic insulation cost breakdown →

Keep reading

Attic Insulation: the complete guide

Sources: HomeAdvisor — Attic insulation cost · ENERGY STAR — Recommended home insulation R-values. Ranges are rounded estimates; see our editorial policy.