Insulation in Dayton, Maine

Insulation and air sealing in Dayton

Dayton runs to about 18 square miles and roughly 2,313 people. It sits about 18 miles southwest of downtown Portland. Around 872 housing units sit inside those boundaries. The community dates back to 1854. We cover ZIP code 04005.

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

The housing stock in Dayton

The typical home in Dayton dates to around the early-1990s. 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 Union Falls and Goodwins Mills. Housing age and construction shift across Dayton, sometimes by decades within a few streets, which is why we look in the attic before quoting rather than after.

Dayton is a small town on the Saco River across from Saco and Buxton, set off from the southern part of Hollis in 1854. The Great Fires of 1947 destroyed two-thirds of Dayton, including 27 homes, four barns and the town hall.

Dayton homes in the Census numbers

The Census Bureau estimates 872 homes in Dayton. 120 of them (14%) went up before 1940 — 43rd of 64 places on this site for pre-1940 housing. The 1990s were the busiest decade, adding 203 of today's homes (23%); 37% predate 1980 and 28% were built in 2000 or later. For York County as a whole the pre-1940 share is 20%, so Dayton sits below it.

Of 829 occupied homes, 0% heat with utility gas and 7% with electricity; another 14% burn propane or other tank gas. Electric heat here is less common than across the county (10%), and ranks 43rd 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.

90% of occupied homes are owner-occupied and 89% of all homes are single-family detached houses. With houses like these, the conversations we expect most are about the attic, which is where most houses here start.

872 homes, Census ACS 2020–2024 (B25034, B25040, B25003); 829 occupied.

Sealing comes first in Dayton

311 of Dayton's 872 homes (36%) 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 Dayton

Dayton does not publish the energy code edition it enforces, so this page does not name one. Dayton had 2,129 residents in 2020 and is not required to enforce the state code. 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 Dayton publishes settles this. Its permit lists name the work types it cares about, and insulation is not among them in either direction. Section 8.2 of Dayton's Zoning Ordinance exempts repairs, replacement and normal maintenance not requiring structural elements, and decorative changes; insulation is not named, and permit fees are set each year by the Select Board. 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 Dayton

The published number is 207-499-3034. The department page is here.

Permitting is on us, not on you.

Rebates a Dayton homeowner can actually use

Heating fuel in Dayton, by the Census Bureau's count: fuel oil or kerosene in 64% of occupied homes, electricity in 7%, propane or tank gas in 14% (Census ACS 2020–2024). For Dayton homeowners the rebate is Efficiency Maine's: $2,000 for each attic, wall or basement zone of 500 square feet or more at any income ($3,000 moderate, $4,000 low income), with $150 to $300 for attic air sealing on top. 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 York County can apply to York County Community Action Corp (207-324-5762) for free weatherization through MaineHousing instead. See the rebate guide for the tiers and the checklist, and the York County page for the county.

Every layer of an insulated attic, explained

Nearby

Dayton borders Saco, Biddeford, Arundel, Lyman, Hollis and Buxton. These are the ones we also cover, each with its own energy code and permit rule:

Elsewhere in York County we also cover:

How Dayton 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 none of the 7 publishes a permit rule for insulation.

All 29 York County jurisdictions side by side →

Common questions about insulation in Dayton

Code and permit facts checked October 24, 2026, rebates October 24, 2026; housing: Census ACS 2020–2024. Sources: dayton-me.gov (2, 3, 4, 5) · legislature.maine.gov · www2.census.gov (2, 3) · maine.gov · en.wikipedia.org · prd-tnm.s3.amazonaws.com · efficiencymaine.com (2, 3, 4) · energystar.gov · data.census.gov. These change; confirm with the building department at 207-499-3034 or Efficiency Maine at 866-376-2463 first.