Fiberglass insulation installation typically costs $0.80-$2.50 per square foot, or about $1,000-$3,000 for a 1,000-square-foot area. The final price depends on whether the job uses batts or blown-in insulation, the target R-value, access, removal needs, and local labor rates.
| Item | Low | Average | High | Notes |
|---|---|---|---|---|
| Installed fiberglass per sq ft | $0.80 | $1.65 | $2.50 | Standard accessible area |
| 500-sq-ft project | $400 | $825 | $1,250 | New insulation, no removal |
| 1,000-sq-ft project | $800 | $1,650 | $2,500 | Basic installation scope |
| Removal and disposal | $1 | $2 | $3 | Additional cost per sq ft |
What fiberglass insulation costs by area and installation type
For a straightforward project, homeowners commonly pay $0.80-$2.50 per square foot installed. Fiberglass batts generally cost $0.80-$2.00 per square foot, while blown-in fiberglass is often $1.00-$2.50 per square foot. Rates include typical materials and installation, but not extensive air sealing, removal, or repairs.
A 1,000-square-foot attic may cost $1,000-$2,500 for new blown-in insulation, with a national midrange near $1,650. Wall cavities can cost more per square foot because installers may need to open and patch drywall; dense-pack or retrofit work commonly reaches $2-$5 per square foot of wall area. Assumptions: standard fiberglass, ordinary access, no major framing repairs, and midrange U.S. labor rates.
For budgeting, estimate the insulated surface area first, then adjust for access and removal. Attic floor area, not the home’s total living area, is usually the relevant measurement when insulating an accessible attic.
How materials, labor, and removal shape the quote
A contractor’s estimate may combine insulation, installation, equipment, and preparation into one per-square-foot rate. The table shows common component ranges; labor varies with location, crew experience, and how easily the area can be reached.
| Quote component | Typical range | Pricing basis | What changes it |
|---|---|---|---|
| Fiberglass material | $0.30-$1.20 | Per sq ft | R-value, batt or loose-fill |
| Installation labor | $0.40-$1.30 | Per sq ft | Access, layout, crew time |
| Blowing equipment | $50-$200 | Per project | Rental or contractor charge |
| Old insulation removal | $1-$3 | Per sq ft | Depth, contamination, disposal |
| Air sealing or baffles | $200-$1,000 | Per project | Number of leaks and roof bays |
For labor estimates, installers may charge roughly $50-$100 per worker-hour, though many price the work by area or project. Removal, bagging, and disposal may be listed separately rather than included in the installation rate.
Check whether the quote includes prep, equipment, cleanup, and disposal before comparing totals. Two bids with the same square footage can cover very different work.
Attic depth and R-value can raise the installed price
Insulation thickness and performance rating affect both material quantity and labor. A common attic target is R-38 to R-60, depending on climate and existing insulation. Reaching R-49 or R-60 can require additional material and careful coverage around framing, vents, and access paths.
Blown-in fiberglass depth is often around 12-20 inches depending on the product and desired R-value. A shallow top-off over existing insulation may cost less than installing a full-depth layer over a bare attic floor. Roof pitch, low clearance, narrow access hatches, and extensive obstructions can also increase labor.
Measure existing insulation before paying for a full-depth installation. If the current layer is clean and dry, adding material may be less expensive than removing it, but compressed or damp insulation may not provide its rated performance.
Three project examples show how scope changes totals
A simple 500-square-foot attic top-off might use loose-fill fiberglass with no removal. At $1.00-$1.80 per square foot, the estimate is about $500-$900, plus any minimum service charge.
A 1,000-square-foot attic with sparse existing insulation and some air sealing may cost $1,500-$3,000. This assumes standard access, roughly 8-16 crew-hours, and no major cleanup or repairs.
A 600-square-foot attic requiring old insulation removal and replacement may total $1,800-$3,600. Removal at $1-$3 per square foot adds $600-$1,800 before new insulation, with contamination or difficult access potentially increasing the charge.
These examples use broad U.S. ranges; the contractor’s measured area and written scope determine the actual quote.
How long a fiberglass installation takes and what crews charge
A two-person crew may complete an accessible 1,000-square-foot attic in about 4-8 hours when the space is prepared and no removal is needed. A small open attic can take 2-4 hours; removal, air sealing, baffle installation, or a complex layout may extend work to one or two days.
Many companies set a minimum charge of $300-$700 for small jobs, even when the square-foot calculation is lower. Ask whether the estimate includes travel, attic protection, cleanup, and moving stored items. Clearing the work area beforehand can reduce billable time and avoid a return visit.
Regional labor rates shift fiberglass installation prices
Quotes in high-cost metro areas may run 15%-30% above the national middle range, while rural markets can be 10%-20% lower when contractors have shorter travel distances and less demand. Cold-climate regions may also see higher requested R-values, increasing material quantities compared with warmer areas.
Seasonal demand can affect scheduling more than the insulation itself. A busy heating-and-cooling season may mean fewer open appointment times, while flexible scheduling can make it easier to compare bids. Local building requirements and utility programs vary, so any rebate should be confirmed before it is counted in the budget.
Compare at least two itemized bids using the same R-value, area, and removal assumptions. Regional price differences are meaningful, but different job scopes can explain much of the gap.
Which preparation choices can lower the attic insulation bill
Keeping sound existing insulation, clearing access, and limiting work to areas that need improvement can reduce the total. Request separate prices for removal, air sealing, and baffles so optional work is not bundled into one unexplained figure. Air sealing may be worthwhile before adding insulation, but the contractor should identify specific leaks and quote that work distinctly.
Standard fiberglass batts can be economical in open, regularly spaced cavities; blown-in material is often more practical for irregular attic floors. Avoid paying for premium products or a higher R-value without checking local recommendations and the home’s current insulation depth. The most reliable savings come from matching the material and coverage to the actual deficiency.