Use this free attic insulation cost calculator to estimate the cost of insulating or reinsulating an attic in 2026. Enter the attic size and select the insulation type, existing insulation condition, air sealing needs, accessibility and local cost level to create a preliminary project budget.
Attic Insulation Cost Calculator
Estimate insulation installation, removal and air sealing costs.
Estimated attic insulation cost
Planning estimate based on the project options you selected.
This is a preliminary budgeting estimate rather than an insulation contractor quote. Mold, asbestos, pest contamination, roof leaks, ventilation problems and structural repairs can substantially change the final cost.
How This Attic Insulation Cost Calculator Works
The calculator starts with the attic floor area and applies the installed cost range for the insulation type you select. Accessibility and project requirements can then adjust the new-insulation estimate.
Existing insulation removal and air sealing are calculated separately because neither service is required on every attic insulation project. This provides a clearer breakdown than simply applying one price per square foot to the entire job.
Finally, the local cost selector provides a general adjustment for differences in contractor and labor costs. The result is intended for early budgeting rather than as a substitute for an onsite inspection.
Attic Insulation Cost per Square Foot
| Insulation type | Typical installed cost |
|---|---|
| Blown-in insulation | $0.90–$2.40 per sq. ft. |
| Batt / roll insulation | $0.80–$2.60 per sq. ft. |
| Loose-fill insulation | $1.00–$2.50 per sq. ft. |
| Spray foam insulation | $1.50–$5.00 per sq. ft. |
| Reflective insulation | $0.50–$2.20 per sq. ft. |
Installed costs vary according to material, insulation depth, R-value requirements, attic accessibility and contractor labor. Spray foam projects can also vary depending on whether foam is installed at the attic floor or along the roof deck.
What Can Increase Attic Insulation Cost?
Attic size
Square footage is one of the main project cost drivers. Larger attics require more insulation material and generally more installation labor.
Insulation type
Blown-in fiberglass or cellulose is commonly used in existing attics because the material can fill irregular spaces. Spray foam typically costs more per square foot but provides different air-sealing characteristics.
Existing insulation removal
Old insulation may need to be removed when it is damaged, contaminated or unsuitable for the planned insulation system. Removal adds labor, equipment and disposal costs.
Air sealing
Air can leak through penetrations around wiring, plumbing, light fixtures and other openings between the living space and attic. Air sealing these locations may be part of an insulation upgrade.
Attic accessibility
An open attic with easy access is generally easier to work in than an attic with limited headroom, tight access points or numerous obstructions. Difficult working conditions can increase labor costs.
How Much Does Old Attic Insulation Removal Cost?
Professional attic insulation removal commonly costs about $1 to $2 per square foot for non-hazardous material. The actual price depends on insulation type, depth, accessibility and condition.
Insulation affected by mold, water, pests or potentially hazardous materials may require specialized remediation that is not included in the standard removal estimate.
How Much Does Attic Air Sealing Cost?
Air sealing can range from a relatively small project addressing obvious penetrations to extensive work throughout the attic. Published estimates vary considerably according to the amount of work required.
For that reason, this calculator provides basic, standard and extensive air-sealing options instead of applying the same fixed charge to every project.
Do You Always Need to Remove Existing Insulation?
No. Existing insulation can sometimes remain in place when it is dry, clean and compatible with the new insulation. Additional insulation may be installed over existing material in some situations.
Removal becomes more likely when insulation is damaged by water, contaminated by pests, affected by mold or otherwise unsuitable for reuse.
What R-Value Does an Attic Need?
Attic insulation recommendations vary by climate and existing conditions. Published guidance commonly places attic and ceiling insulation targets within roughly the R-30 to R-60 range.
This calculator deliberately does not select an R-value automatically. A contractor or appropriate energy guidance for your climate zone should be used to determine the insulation level required for the property.
What Is Included in This Estimate?
The base estimate covers the selected insulation material and typical professional installation. Existing insulation removal and attic air sealing are included only when those options are selected.
Accessibility and general project requirements are used as estimating adjustments to reflect differences between a straightforward attic and a more labor-intensive installation.
What Is Not Automatically Included?
Mold remediation, asbestos testing or removal, pest cleanup, roof repairs, major ventilation modifications, electrical work and structural repairs are not included automatically.
These conditions may require specialized contractors and can substantially increase the cost of an attic insulation project.
Calculator Methodology
HomeFixLedger uses current published U.S. attic insulation installation ranges as baseline data. Each insulation type receives its own installed cost range rather than using a single generic price.
The base installation estimate is calculated from attic square footage. Accessibility and project requirements then adjust that amount. Existing insulation removal is calculated separately at approximately $1 to $2 per square foot when full removal is selected.
Air sealing is also treated as a separate project component because the amount of work required varies significantly between homes.
The calculator estimates costs only. It does not determine the correct insulation R-value, material thickness or building-code requirement for a specific property.
Last reviewed: September 2026
Frequently Asked Questions
How much does attic insulation cost in 2026?
Professional attic insulation commonly costs about $1 to $4 per square foot, with total costs often around $1,000 to $2,700 for typical projects. Larger attics, premium insulation and additional preparation can increase the total.
How much does it cost to insulate a 1,000-square-foot attic?
Using a broad installed range of $1 to $4 per square foot, a straightforward 1,000-square-foot attic may cost approximately $1,000 to $4,000 before optional removal, air sealing or other repairs.
How much does blown-in attic insulation cost?
Blown-in attic insulation commonly costs about $0.90 to $2.40 per square foot installed. Project size, material, insulation depth and preparation requirements affect the final cost.
How much does spray foam attic insulation cost?
Spray foam attic insulation commonly costs approximately $1.50 to $5.00 per square foot. Costs vary with foam type, thickness and whether the attic floor or roof deck is being insulated.
Should I air seal before adding attic insulation?
Air sealing is commonly performed as part of attic insulation improvements because gaps and penetrations can allow conditioned air to escape. The amount of sealing required depends on the attic and existing construction.