Loose fill insulation typically costs $1-$3 per square foot installed, with a common attic project totaling about $1,500-$3,500. Loose fill insulation cost depends mainly on attic size, target R-value, material, local labor rates, and whether old insulation or air leaks need attention.
| Item | Low | Average | High | Notes |
|---|---|---|---|---|
| Installed attic insulation | $1 per sq ft | $2 per sq ft | $3 per sq ft | Material and installation |
| 1,000-sq-ft attic | $1,000 | $2,000 | $3,000 | Open, accessible attic |
| Blown-in cellulose material | $0.40 per sq ft | $0.70 per sq ft | $1.10 per sq ft | Material only; varies by depth |
| Blown-in fiberglass material | $0.50 per sq ft | $0.85 per sq ft | $1.30 per sq ft | Material only; varies by depth |
Assumptions: Prices reflect typical U.S. residential attic work, standard materials, and normal access; regional bids can differ.
What loose-fill insulation costs for a typical attic
For an accessible attic receiving new insulation, homeowners commonly pay $1,000-$3,500 for 800-1,500 square feet. A small 500-square-foot space may cost $500-$1,500, while a 2,000-square-foot attic can reach $2,000-$6,000 if the requested depth and access are ordinary. These ranges include material and installation, but not major air sealing or removal of contaminated insulation.
Installers often quote by square foot or by the bag count needed to reach a specified R-value. In many climates, adding insulation to reach R-38 costs less than building up to R-49 or R-60. A written quote should identify attic area, material, installed depth, and target R-value.
How material, blowing labor, and access shape the quote
Material is only part of the price. The estimate can include crew time, blower setup, protection around fixtures, and travel or minimum-job charges. Cellulose and fiberglass have different bag coverage, so a low per-bag price does not necessarily mean a lower installed cost.
| Quote component | Typical range | Pricing basis | What changes it |
|---|---|---|---|
| Insulation material | $0.40-$1.30 per sq ft | Material and fill depth | Cellulose or fiberglass, R-value |
| Blowing labor | $0.50-$1.25 per sq ft | Installed area | Crew size, attic access, setup |
| Air sealing | $300-$1,500 | Whole attic or task | Number of gaps and penetrations |
| Old insulation removal | $1-$2.50 per sq ft | Area removed | Depth, debris, disposal needs |
| Access or protection | $100-$600 | Per project | Hatch work, walkways, fixture protection |
Labor estimates may be built from crew hours and hourly rates, although many contractors present a fixed project price. Ask whether the bid includes setup, cleanup, and protection around recessed lights or attic equipment.
How attic size, R-value, and fill depth change pricing
More square footage generally raises the total, but a larger open attic may cost less per square foot than a cramped or obstructed one. Increasing from R-19 to R-49 may require several additional inches of material, depending on product and existing insulation. The installer should state both the final R-value and settled depth, rather than quoting only a number of bags.
In many estimates, adding roughly 6-10 inches over an under-insulated attic can add about $0.30-$0.90 per square foot compared with a thinner top-up. Roof framing, uneven joists, ducts, and storage platforms can complicate coverage. Measure the usable attic floor area and record existing insulation depth before comparing bids.
Can DIY loose-fill installation lower the bill?
Rental blowers may be free or cost about $50-$150 per day when purchased through a material supplier; standalone equipment rental can be higher. A homeowner may save much of the installation labor, but still pays for bags, delivery, protective gear, and preparation. Material for a 1,000-square-foot attic often runs roughly $400-$1,300, depending on product and target depth.
DIY work requires consistent coverage and careful clearance around heat-producing fixtures, flues, and electrical equipment. A professional can be worthwhile when the attic is difficult to access or needs air sealing and ventilation corrections. DIY savings are most realistic in a clear, open attic with no complicated safety or moisture issues.
How regional labor rates shift attic insulation quotes
Prices in high-cost metro areas may run 15%-30% above the national middle range because of wages, travel, and operating expenses. Rural bids can be 5%-20% lower when contractors are nearby, but limited availability or long travel distances can erase the difference. Cold-climate homes may also request higher R-values, increasing material quantities and total cost.
For comparison, a straightforward 1,000-square-foot attic priced at $2,000 in a moderate-cost market might land near $2,300-$2,600 in a costly metro or $1,700-$1,900 in a lower-cost area. These are directional adjustments, not guaranteed local rates. Compare quotes using the same attic area, material, and final R-value.
What removal, air sealing, and access add to the bill
Removing old insulation is a separate charge and may be recommended when it is wet, pest-damaged, or contaminated. Standard removal often adds $1-$2.50 per square foot; extensive cleanup or hazardous-material testing can cost more. Air sealing commonly adds $300-$1,500, with larger or leakier attics at the upper end.
Limited hatch access, low roof clearance, stored belongings, or fragile ceilings can add $100-$600 or require extra labor. Some contractors charge a $250-$500 minimum for small jobs. Request separate line items for removal, air sealing, disposal, and access work so optional scope stays visible.
Three attic bids compared by size and R-value
| Scenario | Scope | Estimated total | Approximate rate |
|---|---|---|---|
| Small top-up | 600 sq ft, add to about R-38 | $900-$1,500 | $1.50-$2.50 per sq ft |
| Typical installation | 1,000 sq ft, reach about R-49 | $1,700-$2,800 | $1.70-$2.80 per sq ft |
| Large, more involved attic | 1,500 sq ft, reach about R-60 with air sealing | $3,500-$6,000 | $2.33-$4 per sq ft |
The third example costs more per square foot because air sealing is included and the higher target may require more material. Assumptions: Normal access and no full insulation removal; local labor and existing conditions affect final bids. Use scenario totals as a reasonableness check, not as a substitute for an on-site estimate.