Roll insulation typically costs $0.80-$2.50 per square foot installed, with a national midrange near $1.50 for standard fiberglass in accessible framing. Total price depends on R-value, the area covered, labor access, removal of old insulation, and local labor rates; material-only purchases can cost considerably less.
| Item | Low | Average | High | Notes |
|---|---|---|---|---|
| Fiberglass rolls, material only | $0.30/sq ft | $0.60/sq ft | $1.10/sq ft | Common R-13 to R-30 products |
| Installed roll insulation | $0.80/sq ft | $1.50/sq ft | $2.50/sq ft | Open, accessible cavities |
| Small project total | $400 | $900 | $1,800 | About 500-900 sq ft |
| Attic insulation project | $800 | $1,800 | $4,000 | About 1,000-1,600 sq ft; access and prep vary |
Installed roll insulation prices by square footage
For standard fiberglass batts or rolls installed between accessible wall studs, floor joists, or roof rafters, a useful planning range is $0.80-$2.50 per square foot. A typical 1,000-square-foot project may run $800-$2,500 before unusual repairs, disposal, or difficult access. The low end usually assumes clear, open cavities and basic R-value; the high end can reflect upgraded material, careful air sealing, or restricted work areas.
For a straightforward project, budget about $1.00-$1.75 per square foot installed. At that rate, 500 square feet costs roughly $500-$875, while 1,500 square feet costs about $1,500-$2,625. Contractor minimum charges can make small jobs more expensive per square foot; a 200-square-foot repair may still require a $250-$600 minimum visit.
Material-only pricing commonly falls around $0.30-$1.10 per square foot for fiberglass rolls, depending on thickness, facing, and R-value. That estimate excludes protective equipment, cutting waste, delivery, and labor. Homeowners comparing quotes should confirm whether the stated area means floor area or the actual surface being insulated, especially for sloped ceilings and irregular cavities.
Assumptions: U.S. dollars, standard fiberglass, normal access, and no major removal or framing repair.
What fiberglass rolls, labor, and prep add to a quote
Contractor estimates may group materials and labor into one installed rate, so the ranges below are approximate portions of a typical job. They help identify what to ask about rather than serving as a separate guaranteed bill. Facing, cutting waste, air sealing, and setup can change the share assigned to each line.
| Quote component | Typical range | Common unit | What changes the price |
|---|---|---|---|
| Fiberglass rolls or batts | $0.30-$1.10 | Per sq ft | R-value, facing, width, brand |
| Installation labor | $0.40-$1.25 | Per sq ft | Access, cutting, fit, crew time |
| Air sealing and prep | $0.10-$0.60 | Per sq ft | Gaps, penetrations, masking |
| Old insulation removal | $1.00-$2.50 | Per sq ft | Material type, depth, disposal |
| Equipment or site protection | $75-$300 | Per project | Containment, access, cleanup |
Labor is often billed as part of a square-foot rate, but a crew may price small or complicated work by time. Typical insulation labor rates are about $50-$100 per worker-hour, before company overhead and materials. A two-person crew working five hours at $65 per worker-hour represents $650 in direct labor before travel, supplies, and overhead.
Ask whether the quote includes air sealing, cleanup, and waste disposal. These items are not always included in a low advertised installation rate. Also check if the installer will cut around wiring and plumbing carefully, maintain required ventilation clearances, and install facing in the correct direction for the assembly.
How R-value, cavity depth, and access change the rate
R-value is a major material and fit driver. Basic R-13 fiberglass for a standard 2-by-4 wall often costs less per square foot than thicker R-19 or R-21 products used in deeper cavities. Installed pricing may rise by roughly $0.10-$0.50 per square foot when moving to a higher R-value, though the increase depends on product availability and whether the cavity can accommodate the insulation without compression.
For attic floors, R-30 to R-38 rolls or batts generally cost more than thinner wall products. As a broad installed comparison, R-13 to R-15 may fall around $0.80-$1.60 per square foot, R-19 to R-21 around $1.00-$1.90, and R-30 to R-38 around $1.25-$2.50. These ranges assume open access; roof geometry, kneewalls, and tight eaves can push labor higher.
Job size affects both total cost and unit price. A 1,000-square-foot open attic may receive a lower per-square-foot rate than a 150-square-foot patch because setup and travel are spread across more area. Irregular framing also creates cutting waste: budgeting 5%-10% extra material is common, while unusual spacing or many short cavities may require more.
Never compress a roll to force it into a shallow cavity. Compression reduces its effective thermal performance, and an oversized batt can leave voids at the edges. A 2-by-4 wall cavity generally cannot take a product intended for a much deeper space without affecting fit; the contractor should specify product thickness and intended R-value in writing.
When installation labor rises in walls, attics, and crawl spaces
Open, unobstructed framing is the least labor-intensive installation. Work in finished walls may require opening and patching drywall, which can add $1.50-$4.00 per square foot for access and finishing, or a separate minimum charge for a small area. Insulating an open wall during construction avoids that demolition expense, although the project still requires precise fitting around electrical boxes and utilities.
Attic floors can be efficient when the hatch is large and the joists are exposed. Low roof clearance, long travel from the hatch, steep access ladders, or delicate stored items slow the work. Crawl spaces often cost more than accessible attics because workers must handle restricted clearance, moisture barriers, and protective cleanup. A difficult space can add 20%-50% to labor compared with a clear, open installation.
For a typical 1,000-square-foot accessible attic, a two- or three-person crew may complete placement in roughly 4-8 hours, including basic preparation. A 600-square-foot crawl space with limited clearance may take 8-16 crew-hours, depending on obstructions and whether old material must be removed. These are work-time estimates, not a promise of same-day scheduling or completion.
Labor pricing should describe the actual installation conditions. Compare what each contractor includes: moving stored items, masking, sealing gaps, cutting around obstructions, and cleanup. Assumptions: typical residential crew, no framing repairs, and ordinary travel distance.
How Midwest, coastal, and rural labor rates compare
Regional differences are most visible in labor, travel, and disposal rather than in the basic roll product. In lower-cost Midwest and Southern markets, a straightforward installation may land about 5%-15% below a national midpoint. Dense Northeast and West Coast markets can run roughly 10%-25% above it, particularly where contractor wages, permits, parking, or disposal fees are high.
Those percentages are broad comparisons, not fixed regional tariffs. A rural project may have lower hourly wages but a $75-$200 travel or mobilization charge, while a city contractor may have a higher base rate but shorter travel. Areas with cold winters may see more demand before heating season; coastal locations can have additional moisture-control considerations that affect material selection and prep.
Use local bids for the final budget, and compare the same scope. For instance, a $1.20-per-square-foot quote that excludes removal may be more expensive overall than a $1.70 quote that includes disposal and air sealing. Request the product R-value, installed area, and any fixed trip or minimum fee so that regional comparisons do not hide different work descriptions.
Three sample roll insulation quotes for common jobs
These examples illustrate how area, R-value, and access combine. They assume ordinary fiberglass products and standard local labor; actual bids vary with region and contractor minimums. Figures are illustrative ranges rather than national price guarantees.
| Project | Scope and rate | Labor estimate | Estimated total |
|---|---|---|---|
| Small wall bay repair | 250 sq ft, R-13, $1.25-$2.00/sq ft | 2 workers, 3-5 hours | $400-$700 |
| Open attic floor | 1,000 sq ft, R-30, $1.25-$2.10/sq ft | 2-3 workers, 4-8 hours | $1,250-$2,100 |
| Restricted crawl space | 600 sq ft, R-19, $1.75-$3.00/sq ft | 2 workers, 8-16 hours | $1,050-$1,800 |
The crawl-space range assumes installation only. If contaminated, wet, or deteriorated insulation needs removal, add roughly $1.00-$2.50 per square foot, plus any containment or remediation charge. The attic example assumes an open floor with no extensive air sealing or removal; a difficult hatch or dense storage can add several hundred dollars.
Check arithmetic against measured coverage, not an approximate room footprint. A contractor should state the surface area, material quantity, R-value, and labor scope. If the quote lists only a lump sum, ask for those details and whether the price changes if the measured area differs from the initial estimate.
Old insulation removal and moisture repairs can change totals
Removing existing fiberglass commonly adds $1.00-$2.50 per square foot, including bagging and ordinary disposal. More difficult access, heavy debris, or unusually deep material can raise the price. Pest-contaminated insulation may require additional containment and sanitation, while suspected asbestos-containing material should be evaluated by qualified professionals rather than handled as ordinary fiberglass waste.
Moisture problems should be addressed before new rolls are installed. A roof leak, plumbing leak, or persistently damp crawl space can damage new material and reduce its performance. Minor air sealing may cost $100-$500 on a small job; repairs to ventilation, roofing, plumbing, or a vapor barrier are separate and can substantially increase the project total.
Electrical and ventilation clearances also affect placement. Recessed lights, flues, and other heat-producing equipment may require specific clearance or protective components. A contractor should identify these conditions before work begins rather than covering an unsafe fixture or blocking soffit ventilation to achieve a target thickness.
Get removal and repair costs separated from the new insulation price. A line-item quote makes it easier to decide whether the existing material can remain, whether a moisture issue must be repaired first, and how much of the total is for the insulation itself.
Ways to lower the roll insulation bill without losing R-value
Measure the area accurately and define which surfaces are included before collecting bids. Combining several accessible rooms or attic zones can spread a contractor’s minimum charge across more square footage. Clearing stored items and providing safe access may reduce setup time, but homeowners should not enter unsafe attics or crawl spaces to prepare them.
Compare fiberglass products by stated R-value and installed thickness rather than choosing solely by price per roll. Standard unfaced rolls can cost less where no facing is required; faced products may be appropriate for specific assemblies, but the facing must be selected and installed correctly. Avoid paying for a higher R-value that cannot fit the cavity as designed, and avoid cutting costs by leaving gaps or compressing material.
Request at least three written estimates that specify material, coverage, labor, removal, air sealing, disposal, and any minimum charge. Schedule nonurgent work when local demand is lower if contractors offer more flexible availability. If only a small area is damaged, compare a targeted repair with whole-area replacement, while checking that the surrounding insulation is dry, clean, and still properly installed.
The strongest savings usually come from a clear scope, open access, and avoiding unnecessary demolition. A low bid is not a saving if it omits required prep or leaves uncovered cavities. Confirm the final price, change-order terms, product R-value, and cleanup responsibility before work starts.