Fiberglass attic insulation costs about $1-$3 per square foot installed, with many 1,000-square-foot projects totaling $1,000-$3,000. The final price depends on batt or blown-in material, the R-value needed, labor access, air sealing, and whether old insulation must be removed.
| Item | Low | Average | High | Notes |
|---|---|---|---|---|
| Installed fiberglass insulation | $1,000 | $2,000 | $3,000 | For a 1,000-square-foot attic |
| Installed price per square foot | $1.00 | $2.00 | $3.00 | Varies by method and access |
| Blown-in fiberglass | $1.00 | $1.75 | $2.75 | Installed per square foot |
| Fiberglass batts | $0.80 | $1.60 | $2.50 | Installed per square foot |
| Old insulation removal | $1.00 | $2.00 | $3.50 | Per square foot, before replacement |
What fiberglass attic insulation costs by installation type
For a typical accessible attic, homeowners commonly pay $1,000-$3,000 to insulate 1,000 square feet. A straightforward blown-in job often falls near $1,000-$2,750; installing fiberglass batts may cost $800-$2,500 when the framing is open and easy to reach. Small jobs can exceed the per-square-foot ranges because contractors may charge a minimum visit or setup fee.
These prices generally assume standard fiberglass, installation over a clear attic floor, and no major air-sealing or electrical work. Attics with tight access, irregular framing, or significant debris can cost more. Assumptions: 1,000 square feet, standard materials, typical U.S. labor, and normal access. For a basic 1,000-square-foot project, budgeting around $2,000 is a useful starting point.
How materials, labor, and removal shape the quote
A contractor’s estimate may combine insulation, installation labor, equipment, and preparation. Ask whether the stated price includes the target R-value, air sealing, cleanup, and disposal; two quotes can cover different scopes even when both describe fiberglass insulation.
| Quote component | Low | Average | High | Typical pricing basis |
|---|---|---|---|---|
| Fiberglass material | $0.35 | $0.70 | $1.20 | Per square foot |
| Installation labor | $0.40 | $0.90 | $1.50 | Per square foot |
| Equipment and setup | $75 | $175 | $350 | Per project |
| Old insulation removal | $1.00 | $2.00 | $3.50 | Per square foot |
| Air sealing | $200 | $600 | $1,500 | Per attic, depending on leaks |
These component ranges are not necessarily additive: removal, access work, and air sealing may be quoted separately, while a contractor’s bundled rate may include some of them. For reference, insulation crews may charge about $50-$100 per worker-hour, with labor commonly taking 4-10 hours on an uncomplicated residential attic. Confirm the written scope before comparing totals.
Attic square footage and R-value can change the price
Area is the simplest cost driver: at $1-$3 per square foot, each additional 100 square feet adds roughly $100-$300 before special preparation. Measure the attic floor rather than the home’s finished living area, and check whether the quote includes inaccessible corners or a garage attic.
Required insulation depth depends on the existing layer and the target R-value. Many cold-climate recommendations fall around R-49 to R-60, while some warmer regions use lower targets; local energy guidance and building requirements vary. Adding several inches over existing insulation can cost less than removing everything, provided the old material is dry, clean, and suitable to cover. Moving from a modest top-up to a full R-49 or R-60 installation can raise material and labor needs substantially.
When removal and attic preparation add extra charges
Removal is often the largest added expense, particularly if the attic contains damaged, contaminated, or compacted insulation. Clearing 1,000 square feet at $1-$3.50 per square foot can add $1,000-$3,500, and disposal or protective containment may be included or billed separately. Suspected rodent waste, moisture damage, or hazardous material requires assessment rather than simply covering it.
Air sealing around plumbing, wiring, recessed lights, and attic hatches commonly adds $200-$1,500, depending on the number and size of openings. Contractors may also charge for a raised walkway, baffles at eaves, or a hatch cover. These improvements can be worthwhile when they address real leakage or ventilation problems, but should appear as clearly itemized work. Ask which preparation tasks are required and which are optional upgrades.
How regional labor rates shift fiberglass installation prices
Prices in high-cost metropolitan areas and parts of the Northeast or West Coast may run about 10%-25% above a national midrange. Competitive markets in parts of the Midwest and South may be 5%-15% below it, although local demand, travel distance, and contractor availability can outweigh broad regional patterns.
For the same 1,000-square-foot standard installation, a lower-cost market might produce a $900-$2,500 quote, while an expensive urban market could reach $1,200-$3,750. These comparisons assume similar insulation depth and scope, not removal or major repairs. Compare quotes from local contractors using the same square footage, R-value, and included work.
Blown-in fiberglass or batts for an uneven attic floor
Blown-in fiberglass usually costs about $1-$2.75 per square foot installed and can cover irregular areas without cutting pieces to fit each joist bay. It is often practical when the attic floor is open but has numerous obstructions. The contractor should provide the planned installed depth and avoid blocking soffit ventilation.
Fiberglass batts can cost about $0.80-$2.50 per square foot installed when joist bays are accessible and regular. They may suit a clean attic with consistent framing, but gaps, compression, or poorly fitted edges can reduce performance. Choose by attic layout and installation quality, not by material price alone.
Three attic quotes show how project scope affects totals
| Project example | Scope | Estimated total |
|---|---|---|
| Top-up | 800 sq. ft. blown-in at $1.25-$2.25 per sq. ft.; 4-6 labor hours | $1,000-$1,800 |
| Open, empty attic | 1,200 sq. ft. batts at $1.10-$2.20 per sq. ft.; 6-9 labor hours | $1,320-$2,640 |
| Removal and replacement | 1,000 sq. ft. removal at $1.50-$3.00 plus new fiberglass at $1.25-$2.50 per sq. ft.; 8-12 labor hours | $2,750-$5,500 |
These examples use broad installed-rate estimates and assume standard access; local bids may price work differently. The removal example excludes substantial air sealing, contaminated-material handling, and repairs. Check that each bid identifies the attic area, insulation depth, disposal, and any separate preparation charges.
Ways to lower the attic insulation bill without cutting coverage
Get at least three itemized estimates and compare the same insulation type, area, target R-value, and preparation scope. A quote that excludes removal or air sealing is not directly comparable to one that includes it. Scheduling during a contractor’s less-busy period may improve availability, though seasonal discounts are not guaranteed.
Keep the attic floor clear before the crew arrives if the contractor permits homeowner preparation, and ask whether existing insulation can safely remain. Avoid paying for removal when a qualified inspection finds it dry and in usable condition. Skip upgrades that do not address a documented problem, but do not compress insulation, cover ventilation paths, or omit necessary air sealing just to reduce the initial bill. Controlling scope and comparing equivalent bids are the most reliable ways to manage the final price.