INSULATION COST GUIDE 2026
Validated 2026 cost ranges and rebate programs · Last reviewed October 2026
About This Guide
This guide provides researched, validated insulation cost ranges for homeowners in Vermont and Maine as of 2026. Costs include estimated materials and labor for professionally installed retrofit projects and are rounded planning estimates — not contractor quotes. Actual prices vary by home condition, accessibility, material choice, and local contractor rates.
Each state section also summarizes the current utility rebate program available for qualifying professional weatherization work. Rebate eligibility, caps, and program rules change — always confirm details with the program administrator before starting a project.
Find Your State
Use the interactive map to check whether we have validated 2026 insulation cost data for your state. Click Vermont or Maine to jump to that state's cost table and rebate details; click any other state to request local information.
Select Your State
Click a state to see cost and rebate availability. We currently have validated 2026 data for Vermont and Maine.
Tip: Click any state on the map above. Vermont and Maine (highlighted in dark navy with callout pins) show validated 2026 cost data; clicking any other state will open details to contact us for local information.
Vermont
IECC Zone 6 (north) / Zone 5 (south)Vermont's cold climate makes attic, wall, and basement insulation especially valuable. The ranges below reflect Burlington-market contractor pricing for typical 2026 retrofit projects, including materials and professional labor. A 2026 Vermont attic pricing reference indicates roughly $1,650 to $6,700 for typical projects in the Burlington market — treat this only as a broad market reference, not a fixed price per square foot.
Efficiency Vermont — Home Performance with ENERGY STAR®
Effective July 1, 2026- •Standard income: 75% of qualifying project costs, up to $3,000 maximum.
- •Low & moderate income: 75% of qualifying project costs, up to $7,000 maximum (subject to eligibility).
- •Program requirements: Participating Efficiency Excellence Network contractor, blower-door & health/safety testing, ≥10% air-leakage reduction, and program approval. Previous rebates may reduce remaining eligibility.
Homes served by Vermont Gas Systems or Burlington Electric Department may be on a different utility rebate. Your local provider will confirm available incentives. Some income-eligible households may qualify for free weatherization.
View official Vermont rebate detailsMaine
IECC Zone 6 (interior) / Zone 7 (north)Maine's cold climate and strong Efficiency Maine incentive make insulation one of the highest-return home improvements available. The ranges below reflect Greater Portland–area contractor pricing for typical 2026 retrofit projects, including materials and professional labor. Blown attic insulation in Maine typically runs about $1.17–$1.46 per square foot (fiberglass or cellulose); spray foam costs significantly more.
Efficiency Maine — Home Energy Savings Program (Insulation & Air Sealing)
Current as of October 2026- •Large zone (500+ sq ft): Low income: $4,000 · Moderate income: $3,000 · Any income: $2,000 — per zone completed (attic, wall, or basement).
- •Small zone (250–499 sq ft): Low income: $2,000 · Moderate income: $1,500 · Any income: $1,000 — per zone completed.
- •Air sealing: Attic: $300 / $225 / $150 · Basement: $200 / $150 / $100 (low / moderate / any income).
- •Lifetime limits: Up to $8,600 per building (up to $5,600 for mobile homes). One insulation + one air-sealing rebate per zone.
Rebates require installation by an Efficiency Maine Residential Registered Vendor and work performed in accordance with the Weatherization Requirements Checklist. Income-eligible households may also qualify for additional heat-pump and weatherization assistance.
View official Maine rebate detailsLooking for Another State?
This guide currently covers Vermont and Maine. Insulation costs, climate zones, and rebate programs vary significantly by state and utility service area. If you're planning a project in another state, we can help you find local, vetted insulation professionals and research the incentives available in your area.
Request cost information for your state
Tell us where your home is and we'll connect you with a local professional who can provide accurate, up-to-date pricing and rebate details.
How Costs Are Estimated
- Materials + labor: Professional installation ranges include both material costs and contractor labor for typical retrofit projects.
- Project scope matters: Attic, wall, and basement/crawlspace work each have distinct cost drivers — access difficulty, cavity depth, and whether removal of old insulation is required.
- Material choice: Blown fiberglass and cellulose are the most affordable; closed-cell spray foam costs the most per square foot but adds air sealing and moisture resistance.
- Air sealing: Most professional weatherization projects pair insulation with air sealing and a blower-door test, which adds a separate cost component.
- Whole-house scope is estimated from the home's overall condition — not by multiplying a single per-square-foot rate across the entire floor area.
Estimates are for planning purposes only and were last reviewed in October 2026. Actual costs, insulation needs, energy savings, rebate eligibility, and available funding vary by home, project, and program year. A professional assessment and program approval are required to confirm pricing and incentives. Rebate program details are summarized from publicly available utility and state program information and may change without notice.