How much does it cost to replace a attic insulation in 2026?
Interactive estimate from published 2026 national cost data, adjusted by state.
No email, no phone number — just the range you should expect before talking to contractors.
–
Planning estimate (per sq ft (blown-in)) — actual quotes vary with site conditions. Get 3+ written quotes.
Insulation cuts the electricity bill that solar offsets — run both numbers: Solar Savings Map
What drives the cost
Target R-value for your climate zone
Material: cellulose vs fiberglass vs rockwool
Air-sealing before insulating (worth it, adds cost)
Old insulation removal if damaged or vermiculite-contaminated
Repair or replace?
Insulation doesn't get repaired, it gets topped up. If you can see the joists, you need more. Published prices vary wildly ($1–$8/sq ft) because scope varies — get the R-value and air-sealing scope in writing when comparing quotes.
Frequently asked questions
How much does it cost to replace a attic insulation in 2026?
Nationally, expect roughly $1,800–$4,800 for a typical project (1,200 sq ft) at mid-range quality (per sq ft (blown-in)). High-cost states run 15–35% above these numbers and low-cost states 5–15% below — use the calculator above to adjust for your state, project size and quality tier.
Should I repair or replace my attic insulation?
Insulation doesn't get repaired, it gets topped up. If you can see the joists, you need more. Published prices vary wildly ($1–$8/sq ft) because scope varies — get the R-value and air-sealing scope in writing when comparing quotes.
What drives attic insulation replacement cost up or down?
Target R-value for your climate zone; Material: cellulose vs fiberglass vs rockwool; Air-sealing before insulating (worth it, adds cost); Old insulation removal if damaged or vermiculite-contaminated.
Methodology & sources
National range cross-checked against multiple published 2026 cost guides (Angi, HomeGuide, Homewyse, This Old House, Fixr and trade publications) in July 2026.
State adjustment uses an editorial labor-cost index (0.85–1.35 vs national average) — a simplification of real regional variation.
Quality tiers apply published multipliers for material/type differences (Top-up over existing / Full install to R-49 / Remove old + reinstall).
Ranges exclude financing, unusual site conditions, and code-upgrade surprises.