Insulation in North Yarmouth, Maine

Insulation and air sealing in North Yarmouth

North Yarmouth runs to about 21 square miles and roughly 4,240 people. It sits about 13 miles north of downtown Portland. Around 1,612 housing units sit inside those boundaries. The community dates back to 1680. We cover ZIP code 04097.

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

The housing stock in North Yarmouth

The typical home in North Yarmouth dates to around the early-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 Walnut Hill. Housing age and construction shift across North Yarmouth, sometimes by decades within a few streets, which is why we look in the attic before quoting rather than after.

An inland town north of Yarmouth whose one named village is Walnut Hill. Chartered in 1680, it once took in the land of today's Yarmouth, Cumberland, Freeport, Pownal and Harpswell, which split off between 1750 and 1849.

North Yarmouth homes in the Census numbers

The Census Bureau estimates 1,612 homes in North Yarmouth. 205 of them (13%) went up before 1940 — 45th of 64 places on this site for pre-1940 housing. The 1980s were the busiest decade, adding 285 of today's homes (18%); 45% predate 1980 and 23% were built in 2000 or later. For Cumberland County as a whole the pre-1940 share is 23%, so North Yarmouth sits below it.

Of 1,549 occupied homes, 4% heat with utility gas and 11% with electricity; another 15% burn propane or other tank gas. Electric heat here is less common than across the county (15%), and ranks 24th of 64 on this site. Whoever comes out will ask what heats the house first: the rebate is the same on any fuel, but the saving is not.

87% of occupied homes are owner-occupied and 94% of all homes are single-family detached houses. On a housing mix like this, the likely starting points are the attic, which is where most houses here start.

1,612 homes, Census ACS 2020–2024 (B25034, B25040, B25003); 1,549 occupied.

Sealing comes first in North Yarmouth

524 of North Yarmouth's 1,612 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 North Yarmouth

North Yarmouth enforces the Maine Uniform Building and Energy Code (2021 IECC with Maine amendments). North Yarmouth had 4,072 residents in the 2020 Census, just over the 4,000 at which state law requires a town to enforce the state code, energy chapter included.

Under that edition the required attic value for new work here is R-60, and walls R-30, or R-20 + R-10 continuous, or R-13 + R-15 continuous, or R-20 continuous. For comparison, the Department of Energy recommends R60 for an uninsulated attic in climate zone 6A, where North Yarmouth sits, and R49 where there are already a few inches up there.

The 2021 IECC insulation table (R402.1.3), climate zone 6; Maine's energy chapter changed the wood-frame wall entry and left the attic at R-60.

Do you need a permit to insulate here?

Nothing North Yarmouth publishes settles this. Its permit lists name the work types it cares about, and insulation is not among them in either direction. The town's Code Enforcement FAQ says no building permit is needed when there are no structural changes; it does not mention insulation by name, and every permit carries a $25 administrative fee. 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 North Yarmouth

The published number is 207-829-3705. The department page is here.

Permitting is on us, not on you.

Rebates a North Yarmouth homeowner can actually use

60% of the occupied homes in North Yarmouth burn fuel oil or kerosene for heat, 11% use electricity and 15% propane or other tank gas, and 4% utility gas (Census ACS 2020–2024). The insulation money for a North Yarmouth 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. The Cumberland County page and the rebate guide carry the full rules.

Nearby

North Yarmouth borders Cumberland, Yarmouth, Pownal, Gray and New Gloucester. These are the ones we also cover, each with its own energy code and permit rule:

Elsewhere in Cumberland County we also cover:

How North Yarmouth 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 North Yarmouth

Code and permit facts checked October 24, 2026, rebates October 24, 2026; housing: Census ACS 2020–2024. Sources: northyarmouth.org (2, 3, 4, 5, 6, 7) · legislature.maine.gov · www2.census.gov · maine.gov (2) · en.wikipedia.org (2, 3) · 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 207-829-3705 or Efficiency Maine at 866-376-2463 first.