Attic Insulation Cost Calculator

Enter your attic area and target R-value to estimate insulation materials, labor, removal, air sealing, and total budget.

Attic area(sq ft)

Insulation type

Target R-value

Attic target is often R-38 to R-60 depending on climate zone

Existing insulation

Air sealing

Material price($/sq ft)

Leave 0 to use the type default scaled to your target R-value.

Labor rate($/sq ft)

Leave 0 to use the type default.

Waste factor(%)

Contingency(%)

Important: Spray foam application and removal of existing insulation may require professional handling and protective equipment. Pre-1978 homes may contain hazards such as asbestos or lead — have materials assessed before disturbing them.

Estimated Project Budget

$2,438

Attic Insulation

Materials: $1,277
Labor: $550
Other costs: $350
Contingency: $261
Total: $2,438

Materials$1,277 (52%)
Labor$550 (23%)
Other costs$350 (14%)
Contingency$261 (11%)

Target R-value

R-49

Required depth

19.6 in

Material cost used

$1.16/sq ft

Total cost per sq ft

$2.44

Planning range (not a confidence interval)

Low

$2,072

Central

$2,438

High

$3,047

Low reflects easy access and basic blown product; high reflects difficult access, premium product, or extensive prep. Energy savings are not guaranteed and depend on climate and air sealing. This is a planning band, not a statistical confidence interval.

Itemized breakdown

Insulation material (Blown fiberglass) 1,000 sq ft × $1.16/sq ft + 10% waste	$1,277
Installation labor 1,000 sq ft × $0.55/sq ft	$550
Air sealing allowance 1,000 sq ft × $0.35/sq ft	$350
Contingency (12%) 12% of $2,177	$261

This is a budgeting estimate for planning only — not a contractor quote. Actual costs vary by location, site conditions, material grade, and labor market. Always collect itemized quotes from licensed local professionals.

Pricing data version insulation-v1 · as of 2025-01-01

How We Calculated This

Area = attic area entered in sq ft.
Material cost/sq ft = type baseline ($/sq ft at R-38) × (target R-value ÷ 38), unless a material price override is entered.
Materials = area × material cost/sq ft, then × (1 + waste factor%). Waste applies to material cost only.
Labor = area × labor rate (type default or user override).
Removal = area × $1.25/sq ft, added only when existing insulation is removed.
Air sealing = area × $0.35/sq ft, added only when air sealing is enabled.
Total = materials + labor + removal + air sealing + contingency.
Required depth (in) = target R-value ÷ material R-per-inch.
Total cost per sq ft = total ÷ attic area.

Assumptions

R-value explanation: higher R = more resistance to heat flow; required depth depends on material R-per-inch.
All prices are editable planning assumptions, not verified or guaranteed national averages.
Energy savings are not guaranteed and depend on climate zone and air sealing.

What's excluded

Knob-and-tube wiring remediation
Mold or moisture damage repair
Structural venting changes
Asbestos handling

Sources & Pricing Methodology

Editable demonstration dataset (Renovation Cost Lab)
Default prices and R-per-inch figures are reasonable planning assumptions, not verified national averages. Replace with local quotes.

Full methodology: how we handle prices.

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