Insulation in Naples, Maine

Insulation and air sealing in Naples

Naples runs to about 32 square miles and roughly 3,985 people. It sits about 29 miles northwest of downtown Portland. Around 3,360 housing units sit inside those boundaries. The community dates back to 1834. We cover ZIP code 04055.

No completed job in Naples is logged in our records yet, and this page will say so until one is.

The housing stock in Naples

The typical home in Naples dates to around the late-1980s. Houses of this vintage usually got batts or blown fiber at whatever the standard of the day was, which is well short of what is recommended now. Most are one top-up away from being right.

That includes Edes Falls and South Naples. Housing age and construction shift across Naples, sometimes by decades within a few streets, which is why we look in the attic before quoting rather than after.

Naples sits where Long Lake, Brandy Pond and Sebago Lake are joined by the Songo River and the Songo Lock, and lake tourism has been its main business since the 1800s. Early farms on rocky glacial soil gave way to inns and summer visitors.

Naples homes in the Census numbers

The Census Bureau estimates 3,360 homes in Naples. 148 of them (4%) went up before 1940 — one of the five lowest pre-1940 shares among the 64 places on this site. The 1980s were the busiest decade, adding 684 of today's homes (20%); 34% predate 1980 and 32% were built in 2000 or later. For Cumberland County as a whole the pre-1940 share is 23%, so Naples sits below it.

Of 2,021 occupied homes, 3% heat with utility gas and 7% with electricity; another 25% burn propane or other tank gas. Electric heat here is less common than across the county (15%), and ranks 39th of 64 on this site. Efficiency Maine's insulation rebates do not depend on the fuel or the utility, but the fuel decides what the work saves, so the assessment asks how the house is heated.

88% of occupied homes are owner-occupied and 81% of all homes are single-family detached houses, with 355 mobile homes in the count. On a housing mix like this, the likely starting points are air sealing on newer houses that already have depth.

3,360 homes, Census ACS 2020–2024 (B25034, B25040, B25003); 2,021 occupied.

Sealing comes first in Naples

1,123 of Naples' 3,360 homes (33%) were built in the 1980s and 1990s. The gaps in houses of that age are the parts nobody sealed: batts stuffed into the rim joist, bare spots over cathedral and tray ceilings, soffit vents buried with no baffles, can lights punched through the ceiling plane. A top-up plus a day of sealing usually covers it.

What the energy code requires in Naples

Naples does not publish the energy code edition it enforces, so this page does not name one. Naples had 3,925 residents in 2020, under the 4,000 at which a town must enforce the state code, and its 2026 Comprehensive Plan lists getting ready to enforce it as a future task. Maine has one energy code for the whole state, the 2021 IECC with Maine's changes. A town of 4,000 or fewer people does not have to enforce it, but the state says it still applies to every building, and meeting it is the owner's responsibility.

Do you need a permit to insulate here?

Nothing Naples publishes settles this. Its permit lists name the work types it cares about, and insulation is not among them in either direction. Naples's Land Use Ordinance requires a permit to erect or alter a building, and its Planning and Code page names new buildings and structural alterations. So we ask the department directly before the first day on site, and whatever comes back, pulling it is our job rather than yours.

Permits and inspections in Naples

The published number is 207-693-6364. The department page is here.

Permitting is on us, not on you.

Rebates a Naples homeowner can actually use

Heating fuel in Naples, by the Census Bureau's count: fuel oil or kerosene in 56% of occupied homes, electricity in 7%, propane or tank gas in 25%, and 3% utility gas (Census ACS 2020–2024). The insulation money for a Naples house comes from Efficiency Maine, not the electric company. For a zone of 500 square feet or more it pays $2,000 at any income, $3,000 at moderate income and $4,000 at low income, and $150 to $300 more for attic air sealing. The work has to be done by an Efficiency Maine Residential Registered Vendor, and the attic has to start at R-21 or below and finish at R-49 or more. Income-qualified households in Cumberland County can apply to Community Concepts Inc (207-795-4065) for free weatherization through MaineHousing instead. Every condition is in the rebate guide. The Cumberland County page compares the towns.

Nearby

Naples borders Casco, Sebago, Bridgton, Harrison, Otisfield and Long Lake. These are the ones we also cover, each with its own energy code and permit rule:

Elsewhere in Cumberland County we also cover:

How Naples compares with its neighbors

Maine sets the residential energy code statewide, so the attic figure is R-60 wherever it is published here; what changes is the permit desk, and 2 of the 7 publish a permit rule for insulation.

All 25 Cumberland County jurisdictions side by side →

Common questions about insulation in Naples

Code and permit facts checked October 24, 2026, rebates October 24, 2026; housing: Census ACS 2020–2024. Sources: townofnaples.org (2, 3, 4, 5, 6, 7) · legislature.maine.gov · en.wikipedia.org (2, 3, 4) · zip-codes.com · tigerweb.geo.census.gov · efficiencymaine.com (2, 3, 4) · energystar.gov · data.census.gov. These change; confirm with the building department at 207-693-6364 or Efficiency Maine at 866-376-2463 first.