Fiberglass vs Cellulose Blown Insulation Cost 2026
Homeowners typically pay for blown insulation based on material type, attic size, and installation method. The main cost drivers include material price, attic accessibility, and local labor rates. This article compares fiberglass and cellulose options, with practical pricing in USD and clear low–average–high ranges to help budgeting.
| Item | Low | Average | High | Notes |
|---|---|---|---|---|
| Material (per sq ft) | $0.60 | $0.90 | $1.40 | Fiberglass or cellulose; density varies |
| Labor & Installation (per sq ft) | $0.50 | $0.70 | $1.10 | Attic access, clean-up |
| Total Installed (per sq ft) | $1.10 | $1.60 | $2.50 | Assumes standard attic, 8–10 inches |
| Assumptions | Region, specs, labor hours | Assumptions: region, specs, labor hours. |
Overview Of Costs
Cost ranges for attic insulation vary by material, depth, and access. Typical projects for a standard 1,000–1,500 sq ft attic yield total installed costs in the ranges below, with per-square-foot guidance useful for quick budgeting. The highest costs usually occur with difficult access, extra sealing, or higher insulation depth. Fiberglass tends to be slightly cheaper upfront, while cellulose can offer better overall air-sealing and density.
Cost Breakdown
Itemized components show how money is allocated in a blown insulation project. The table below uses common categories and reflects both total and per-unit pricing. Assumptions: single-story attic, no major structural remediation, standard ventilation, and no permits required beyond typical local codes.
| Category | Low | Average | High | Notes |
|---|---|---|---|---|
| Materials | $0.60 / sq ft | $0.90 / sq ft | $1.40 / sq ft | Fiberglass or cellulose; density 3.0–3.5 PCF |
| Labor | $0.50 / sq ft | $0.70 / sq ft | $1.10 / sq ft | Crews, safety gear, clean‑up |
| Equipment | $0.05 / sq ft | $0.08 / sq ft | $0.15 / sq ft | Blower, hoses, containment |
| Permits | $0 | $0 | $100 | Local rule variations |
| Delivery/Disposal | $0.03 / sq ft | $0.05 / sq ft | $0.10 / sq ft | Waste blankets, protective mats |
| Contingency | $0.04 / sq ft | $0.06 / sq ft | $0.12 / sq ft | Unforeseen access issues |
| Taxes | $0.02 / sq ft | $0.03 / sq ft | $0.05 / sq ft | State/local taxes |
Assumptions: region, specs, labor hours.
What Drives Price
Material choice, insulation depth, and attic access are the main cost drivers. Fiberglass is typically priced lower per square foot due to material costs and ease of handling. Cellulose, often denser, can require more material and slightly longer installation time in tight spaces. A deeper depth (for higher R-values) will raise both material and labor costs. The insulation’s R-value target, attic geometry, and any ventilation requirements influence final pricing more than many homeowners anticipate.
Cost Drivers
Two niche drivers matter in practice: attic size and insulation depth. For a typical 1,200 sq ft attic at 10 inches depth, expect differences of roughly 15–25% between fiberglass and cellulose once labor is included. If the attic has low headroom or messy joists, labor and equipment time increase, pushing total costs higher. Conversely, well‑ventilated, accessible spaces tend to reduce both time and materials waste.
Regional Price Differences
Prices vary by region due to labor markets and material costs. In the Northeast, total installed costs often trend higher due to stricter building codes and higher labor rates, while the South can be more affordable. Midwest markets typically sit in between. A regional delta of roughly ±10–20% relative to national averages is common, with suburban pricing generally higher than rural in many markets.
Labor & Installation Time
Installation speed affects overall cost. A 1,200 sq ft attic with standard access may take 4–6 hours for a crew, translating to about $0.70–$1.10 per sq ft in labor. Poor access or irregular attic shapes can double installation time, increasing labor costs and creating more disposal or containment needs. Scheduling during off-peak seasons can offer modest savings in some markets.
Additional & Hidden Costs
Hidden line items can surprise budgets if not planned. Potential extras include sealing and air‑improvement work, vapor barrier adjustments, or remediation of existing insulation moisture issues. Some contractors charge for protective coverings, cleaning, or temporary containment. If ductwork or vents require resealing, expect additional costs that are not part of standard blown insulation pricing.
Real-World Pricing Examples
Three scenario cards illustrate typical budget ranges for fiberglass and cellulose jobs.
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Basic: 1,000 sq ft attic, standard access, 9 inches depth. Materials: fiberglass at $0.90 / sq ft; Labor: $0.70 / sq ft; Equipment: $0.08 / sq ft; Total: $1.68 / sq ft; Est. Total: $1,680.
data-formula=”labor_hours × hourly_rate”> - Mid-Range: 1,200 sq ft attic, moderate access, 10 inches depth, cellulose preferred. Materials: $1.10 / sq ft; Labor: $0.85 / sq ft; Equipment: $0.10 / sq ft; Permits/Disposal: $0.07 / sq ft; Total: $2.12 / sq ft; Est. Total: $2,540.
- Premium: 1,500 sq ft attic, tight access, 12 inches depth, enhanced air sealing. Materials: fiberglass $1.20 / sq ft; Labor: $1.00 / sq ft; Equipment: $0.15 / sq ft; Contingency: $0.15 / sq ft; Total: $2.50 / sq ft; Est. Total: $3,750.
Assumptions: region, specs, labor hours.
Pricing FAQ
Common questions include how depth relates to R-values, and whether cellulose’s density improves energy performance. In practice, deeper installations increase both material and labor costs, while cellulose’s installation may require more material per square foot but can deliver better air sealing in certain homes. Always compare quotes that itemize materials, labor, equipment, and any disposal fees to avoid hidden charges.
For budgeting accuracy, request a site assessment and multiple quotes that clearly separate per‑sq‑ft costs from total project estimates. This helps compare fiberglass and cellulose on an apples‑to‑apples basis, with transparent assumptions and realistic timelines.