Insulation in Cohasset, Massachusetts

Cohasset is in Eversource territory, so homeowners qualify for the full Mass Save weatherization program. The first step is a no-cost Mass Save Home Energy Assessment, after which Mass Save typically covers 75-100% of approved insulation and air-sealing costs, with 100% for income-eligible households. The 0% Mass Save HEAT Loan, up to $25,000, finances any homeowner share. On Cohasset's older homes the assessment often flags knob-and-tube or pre-1981 vermiculite to resolve first; on the newer stock it points to attic top-ups and air sealing.

Insulation and air sealing in Cohasset generally need no building permit. Use a contractor with a Massachusetts Home Improvement Contractor (HIC) registration, and a Mass Save participating contractor for incentive work. Spray foam must meet state fire and ignition-barrier code, typically a thermal barrier over exposed foam. As a coastal town, Cohasset's conservation commission may review exterior work near wetlands or the shore, though interior insulation rarely triggers it, and older homes near the historic common can face local review for exterior changes. Older wiring or asbestos vermiculite requires licensed electrical or abatement work first.

Cohasset sits in the affluent South Shore coastal market, where insulation pricing runs at the higher end of eastern-Massachusetts rates given access and the age of some homes. As of recent cycles, attic insulation typically runs $1,500-$4,000, dense-pack wall insulation $2,000-$6,000, and air sealing $300-$1,500; spray foam costs more per square foot. Because Cohasset is an Eversource town, the Mass Save 75-100% incentive can bring out-of-pocket cost near zero on approved attic and air-sealing work.

Cohasset is a coastal Norfolk County town of about 8,330 people across roughly 3,290 housing units, with a median home age near 66 years. The South Shore town mixes older shingle-style and colonial homes — some dating well back — with mid-century-and-later houses, so insulation work runs from attic top-ups to full wall retrofits.

Its exposed coastal setting drives air leakage, and the older homes can carry balloon-framed walls, knob-and-tube wiring, and pre-1981 attic vermiculite. Those features set the order of work before walls or attics can be dense-packed or insulated.