When budgeting for attic insulation, buyers often compare fiberglass versus cellulose blown insulation cost. Typical installed prices hinge on material choice, attic size, access, and labor. The following breakdown outlines real-world ranges and the main drivers behind the price gap.
Assumptions: Midwest labor rates, standard attic access, existing ducting intact, normal moisture conditions, and standard blown-in equipment.
| Item | Low | Average | High | Notes |
|---|---|---|---|---|
| Fiberglass blown insulation installed (per sq ft) | $1.20 | $1.85 | $2.60 | Rolled into attic via blower |
| Cellulose blown insulation installed (per sq ft) | $0.85 | $1.25 | $1.75 | Denser material, typically recycled content |
| Typical attic size (2,000 sq ft, flat attic) | $2,400 | $3,700 | $5,200 | Installed price, labor included |
| Labor rate (per hour) | $60 | $85 | $120 | Region-dependent |
| Materials cost share | 40% | 55% | 70% | Fiberglass generally higher per sq ft |
Comparable Installed Costs by Material Type
Fiberglass typically costs more per square foot than cellulose, but may deliver faster installation in some attic configurations. This block shows baseline installed ranges to help buyers compare overall project budgets.
For a 2,000 sq ft attic, installed costs commonly fall in the following bands: fiberglass about $2,400-$5,200; cellulose about $1,700-$3,800. The exact price depends on attic height, complexity, and access.
Major Cost Components in a Blown Insulation Quote
Understanding the quote components helps identify where money goes. The breakdown below lists typical cost drivers for fiberglass and cellulose blown insulation.
| Category | Fiberglass Range | Cellulose Range | Notes |
|---|---|---|---|
| Materials | $0.70-$1.20 per sq ft | $0.50-$0.95 per sq ft | Density and bagged vs loose fill |
| Labor | $0.50-$0.95 per sq ft | $0.40-$0.90 per sq ft | Crew size and access affect hours |
| Equipment | $0.10-$0.25 per sq ft | $0.08-$0.20 per sq ft | Blower, hoses, containment |
| Permits/Inspection | $0.05-$0.15 per sq ft | $0.05-$0.15 per sq ft | Regional requirements vary |
| Delivery/Disposal | $0.05-$0.10 per sq ft | $0.04-$0.08 per sq ft | Waste handling and packaging |
| Warranty/Contingency | $0.05-$0.15 per sq ft | $0.05-$0.15 per sq ft | Moisture barrier or sealants |
What Variables Most Move the Quote Higher
Attic size and access drive most of the cost, followed by system type and local labor rates. Two numeric thresholds commonly shift prices: attic volume (square feet of space to fill) and the insulation density (R-value target). For example, a 3,000 sq ft attic with tight crawl access can push totals well above the baseline ranges.
Regional Price Differences Across the U.S.
Regional markets show meaningful deltas for fiberglass and cellulose installation. Coastal metros tend to be higher, while rural areas may run lower. In practical terms, expect up to a 15-25% spread between high-cost coastal regions and low-cost inland regions for the same attic size.
Labor Time, Crew Size, and Scheduling Impact
Labor hours scale with attic height, obstructions, and access paths. A standard two-person crew can blow in 2,000 sq ft in a day under normal conditions, but longer run lengths or restricted access add hours and raise per-square-foot pricing.
Practical Ways to Reduce Fiberglass or Cellulose Cost
Controlling scope and choosing the right options lowers the total bill. Consider bundling with air sealing, selecting a common density, and avoiding premium additives. If the attic is already well-sealed, cellulose can be a cost-effective substitute without sacrificing performance.
Side-By-Side Quote Factors: Per-Sq-Ft vs Installed Totals
Compare both per-square-foot pricing and full installed totals to avoid lowball baselines. Per-sq-ft prices help estimate, while total project quotes reveal the impact of attic complexity and disposal fees.
How to Benchmark Your Next Quote
Use regional price references and verify product data sheets. Ensure estimates reflect the same R-value target and attic characteristics to make a fair comparison between fiberglass and cellulose options.
Low-Commitment Path: When to Replace Rather Than Add
In some cases, upgrading to higher insulation density or air sealing offers better long-term value than redoing later. If an attic is leaky or has moisture issues, addressing those first can alter both price and performance of the insulation project.