Mass Home Comfort
Find contractors
Insulation · Nantucket, MA

Insulation in Nantucket, Massachusetts

Compare contractors serving Nantucket, Nantucket County — call them directly, or send one request and let the ones who want the job come to you.

30 contractors serving Nantucket.

Contractors serving Nantucket

Claimed listings within 5 miles come first, then the rest by rating, then distance. Google ratings as of October 2026. How we list and rank contractors

Mass Save in NantucketEligible

Nantucket is in National Grid territory (served by the island electric system under National Grid), so homeowners qualify for Mass Save. Insulation and air sealing are the program's flagship weatherization measures, and as of recent rebate cycles Mass Save covers roughly 75 to 100 percent of approved costs (100 percent for income-eligible households). A no-cost Mass Save Home Energy Assessment is the first step.

The 0 percent Mass Save HEAT Loan, up to $25,000, finances the homeowner share. Mass Save is geared to a primary residence, so seasonal-home owners should confirm occupancy rules. Older island houses commonly flag knob-and-tube or vermiculite in pre-1981 attics.

Read next

Insulation in Nantucket — what to know

Permits in Nantucket

Insulation on Nantucket usually needs no standalone building permit, but the contractor should carry a Massachusetts Home Improvement Contractor (HIC) registration, with a Construction Supervisor License (CSL) for related structural work. Mass Save jobs must run through a participating, approved contractor. Spray foam has to meet the state fire and ignition-barrier code. Nantucket's Historic District Commission governs the entire island, so any exterior change is reviewed closely — interior insulation generally is not, but confirm before touching the exterior.

Where a permit is required, insulation work in Nantucket is filed with the Nantucket Building Department; see the Nantucket Building Department’s contact, portal and who pulls the permit on permits.llc.

Typical project cost

Nantucket pricing runs well above mainland Massachusetts because materials and labor often travel by ferry and the island's contractor market is tight and seasonal. As of recent cycles mainland anchors are attic insulation $1,500 to $4,000, dense-pack wall insulation $2,000 to $6,000, and air sealing $300 to $1,500, but island quotes routinely come in higher. Because Nantucket is a Mass Save town, the 75 to 100 percent incentive can still bring net out-of-pocket close to zero for an eligible primary residence once the assessment approves the scope.

About Nantucket homes

Nantucket is its own county, an island town with about 14,065 year-round residents but roughly 12,287 housing units, many of them seasonal — the year-round and seasonal split defines the local market. The median construction age is near 42 years, though that figure masks a core of nationally significant 18th- and 19th-century houses in town alongside late-20th-century homes elsewhere on the island.

For insulation, that means two very different jobs: weatherizing newer year-round homes with attic and air-sealing work, and carefully retrofitting historic houses where exterior changes are tightly controlled and wall cavities may be empty. Salt air and exposed wind raise the value of a tight envelope across the island.

Common questions — Insulation in Nantucket

Does Mass Save pay for insulation in Nantucket?
Yes. Nantucket is served by an investor-owned utility, so after a no-cost Mass Save Home Energy Assessment the program covers 75 to 100 percent of approved insulation and air sealing (no cost for income-eligible households) and finances the rest through the 0 percent HEAT Loan.
Will the Historic District Commission affect my insulation project?
Interior insulation and air sealing generally aren't reviewed, but the Nantucket Historic District Commission governs all exterior changes island-wide. Confirm with the HDC before any work touches the exterior.
Why are insulation quotes higher on Nantucket?
Materials and labor often have to travel by ferry, and the island's contractor market is small and seasonal. Mass Save's 75 to 100 percent incentive offsets much of the difference for eligible homes.
Could my older Nantucket house have knob-and-tube or vermiculite?
In the island's historic stock, both are possible. Knob-and-tube must be addressed before dense-packing, and any pre-1981 vermiculite attic should be tested for asbestos before insulating.

Insulation guides for Massachusetts homeowners

All Insulation guides →

Insulation contractors in nearby towns

EdgartownChathamOak BluffsYarmouthHarwichBarnstableDennisTisbury