Homeowners often compare the cost of fiberglass and cellulose blown insulation. This article outlines typical price ranges, key drivers, and practical budgeting insights to help make an informed decision. Cost and pricing details are provided to support a quick, budget-focused comparison.
| Item | Low | Average | High | Notes |
|---|---|---|---|---|
| Fiberglass Blown Insulation (installed) | $1,800 | $3,200 | $4,900 | Assumes attic or enclosed cavity, standard 3–6 inches, HVAC compatibility. |
| Cellulose Blown Insulation (installed) | $2,100 | $3,400 | $5,400 | Assumes same area and depths; often lower material cost but higher labor time. |
| Per Square Foot (installed) | $0.80 | $1.60 | $2.20 | Depends on depth, access, and region. |
| Per Thousand Square Feet (project) | $1,200 | $2,600 | $4,200 | Assumes typical attic or crawlspace area; price varies by density. |
Overview Of Costs
Pricing for blown insulation hinges on material type, installed depth, attic access, and labor time. Fiberglass typically costs less per unit but may require more labor to achieve the same R-value as cellulose in some cases. Cellulose often provides slightly better air sealing and a lower material cost, but installation can take longer.
Cost Breakdown
The following table summarizes the major cost components for both materials. Assumptions: region, specs, labor hours.
| Component | Fiberglass (Installed) | Cellulose (Installed) |
|---|---|---|
| Materials | $0.50-$1.20 / sq ft | $0.40-$0.95 / sq ft |
| Labor | $0.70-$0.95 / sq ft | $0.90-$1.15 / sq ft |
| Equipment | $0.05-$0.15 / sq ft | $0.05-$0.15 / sq ft |
| Permits | $0-$20 / job | $0-$20 / job |
| Delivery/Disposal | $0-$15 / sq ft | $0-$15 / sq ft |
| Warranty | $0-$60 / job | $0-$60 / job |
| Overhead | 5-10% | 5-10% |
| Contingency | 5-10% | 5-10% |
| Taxes | Varies by state | Varies by state |
What Drives Price
Material type and depth are primary drivers, while attic access and cavity complexity influence labor and time. For fiberglass, density and fiber type (e.g., high-flow vs standard) can shift costs by a few tenths per square foot. Cellulose cost is more sensitive to local supply and equipment used for dense packing.
Labor, Hours & Rates
Installation time can vary with attic size, joist layout, and vehicle access. A typical crew rates range from $60 to $120 per hour, with total labor contributing a sizable portion of the project price. data-formula=”labor_hours × hourly_rate”>
Regional Price Differences
Prices vary by market. In urban West Coast areas, installed costs may be higher due to labor rates and access challenges, while rural regions may see lower totals. Midwest regions often sit in the middle, influenced by material supply. Expect ±10-20% deltas across regions.
Real-World Pricing Examples
Three scenario cards illustrate typical projects with fiberglass vs cellulose. Assumptions: attic size 1,800 sq ft, standard access, no unusual retrofits.
- Basic — Fiberglass: 1,800 sq ft, 3 inches, crew 2 workers, 6 hours; Materials $0.65 / sq ft, Labor $0.90 / sq ft, Totals about $3,500. Cellulose: 1,800 sq ft, 3 inches, same crew; Materials $0.55 / sq ft, Labor $0.95 / sq ft; Totals about $3,900.
- Mid-Range — Fiberglass: 2,000 sq ft at 6 inches, two zones; Materials $0.95 / sq ft, Labor $1.05 / sq ft; Totals around $5,000. Cellulose: 2,000 sq ft at 6 inches; Materials $0.85 / sq ft, Labor $1.15 / sq ft; Totals around $5,400.
- Premium — Fiberglass with high-density mix, tight cavities; 2,200 sq ft at 10 inches; Totals approx. $7,200. Cellulose with dense-pack and air-sealing; 2,400 sq ft, 10 inches; Totals approx. $7,800.
Assumptions: region, specs, labor hours.
Additional & Hidden Costs
Some projects include accessory work that can affect total cost. Vacuuming, sealing gaps, or adding a radiant barrier increases price. Delivery surcharges or disposal fees may apply for large shipments. Always confirm whether waste disposal is included in estimates.
Ways To Save
To budget effectively, compare multiple quotes and consider off-season scheduling. Request a per-square-foot estimate plus a breakdown by materials and labor to identify the larger cost drivers. Ask for density options and recommended R-values for your climate to avoid overpaying for unnecessary depth.
