Insulation in Andover, Massachusetts

Andover is in Eversource territory, so homeowners qualify for the full Mass Save program. A no-cost Mass Save Home Energy Assessment is the first step; Mass Save then typically covers 75-100% of approved insulation and air-sealing costs (100% for income-eligible households), plus the 0% Mass Save HEAT Loan up to $25,000 for the homeowner share. On Andover's newer homes the assessment usually targets attic depth and leakage; older center and antique homes may surface knob-and-tube or vermiculite that needs handling first.

Insulation in Andover usually needs no standalone building permit, but the contractor should hold a Home Improvement Contractor (HIC) registration, with a Construction Supervisor License (CSL) for structural-adjacent work. Mass Save jobs require a participating contractor. Spray foam must meet Massachusetts fire and ignition-barrier code, with a thermal barrier over exposed foam. In older center and antique homes, knob-and-tube wiring must be remediated by an electrician under an electrical permit before the walls are dense-packed.

In the Merrimack Valley, Andover's insulation costs run near or slightly above the statewide average, with larger homes pushing totals up. Attic insulation typically runs $1,500-$4,000, dense-pack wall insulation $2,000-$6,000, and air sealing $300-$1,500; spray foam runs higher. Because Andover is a Mass Save town, the 75-100% incentive can bring out-of-pocket near zero on qualifying work. Home size and any wiring remediation are the main cost drivers.

Andover is an Essex County town of about 36,389 residents in roughly 13,889 housing units, in the Merrimack Valley. The median home is around 54 years old, with a stock that pairs historic homes near the town center and Phillips Academy with extensive postwar and later colonial and cape subdivisions.

That mix gives Andover two insulation stories. Most homes are mid-century or newer and benefit from attic top-ups, air sealing, and dense-pack walls, while the older center and antique homes can carry balloon framing, plaster-and-lath, knob-and-tube wiring, and pre-1981 attics. Air sealing the attic plane and filling empty wall cavities are the upgrades with the clearest payback.