Insulation and air sealing for Sebago homes: attics, crawl spaces, rim joists and walls, starting with a free assessment of the R-value you actually have. The typical home here dates to the mid-1970s, and 17% of its 1,521 homes went up before 1940.
Sebago runs to about 33 square miles and roughly 2,073 people. It sits about 25 miles northwest of downtown Portland. Around 1,521 housing units sit inside those boundaries. The community dates back to 1826. We cover ZIP code 04029.
No completed job in Sebago is logged in our records yet, and this page will say so until one is.
The typical home in Sebago dates to around the mid-1970s. Postwar building here often meant three or four inches of fiberglass and no attempt at air sealing. If nobody has touched it since, that is what is still up there.
We work across Sebago rather than one corner of it — East Sebago, North Sebago, Sebago Center, West Sebago, Hillside and Long Beach included. Construction and vintage change between them, sometimes by thirty years and a whole different framing method, which decides whether a wall can be dense-packed at all.
A rural lake town beside Sebago Lake on rocky, uneven ground, set off from Baldwin in 1826. Inns, hotels and summer camps opened here after the railroad and lake steamboats arrived, and it remains a recreation area.
The Census Bureau estimates 1,521 homes in Sebago. 265 of them (17%) went up before 1940 — 34th of 64 places on this site for pre-1940 housing. More of today's homes date from before 1940 than from any single decade since, and 55% predate 1980. For Cumberland County as a whole the pre-1940 share is 23%, so Sebago sits below it.
Of 841 occupied homes, 1% heat with utility gas and 15% with electricity; another 21% burn propane or other tank gas. Electric heat here is as common as across the county (15%), and ranks 10th 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.
89% of occupied homes are owner-occupied and 85% of all homes are single-family detached houses, with 146 mobile homes in the count. Read together, those numbers point toward the attic, which is where most houses here start.
| Built | Homes | Share | |
|---|---|---|---|
| Before 1940 | 265 | 17% | |
| 1940s | 82 | 5% | |
| 1950s | 200 | 13% | |
| 1960s | 134 | 9% | |
| 1970s | 158 | 10% | |
| 1980s | 188 | 12% | |
| 1990s | 191 | 13% | |
| 2000s | 177 | 12% | |
| 2010s | 105 | 7% | |
| 2020 or later | 21 | 1% |
1,521 homes, Census ACS 2020–2024 (B25034, B25040, B25003); 841 occupied.
492 of Sebago's 1,521 homes (32%) date from 1950 through 1979. The leaks in houses of that era repeat: nothing over the top plates, wire and pipe holes left open, an unsealed hatch, a bath fan venting into the attic, and in ranches and split-levels, heat lost at the garage ceiling and over cantilevered floors. Sealing the plates, holes and fans comes before any more fiber, and it is usually a day's work, not a renovation.
Sebago does not publish the energy code edition it enforces, so this page does not name one. Sebago had 1,911 residents in 2020, and the town's posted list of ordinances has no building code ordinance. 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.
Nothing Sebago publishes settles this. Its permit lists name the work types it cares about, and insulation is not among them in either direction. Sebago's permits page lists painting and wallpapering among work that needs no permit, and its Land Use Ordinance requires one for new buildings and for alterations such as enclosing a porch. So we ask the department directly before the first day on site, and whatever comes back, pulling it is our job rather than yours.
The published number is 207-787-2457. The department page is here.
Permitting is on us, not on you.
Heating fuel in Sebago, by the Census Bureau's count: fuel oil or kerosene in 49% of occupied homes, electricity in 15%, propane or tank gas in 21% (Census ACS 2020–2024). For Sebago 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 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.
Every layer of an insulated attic, explained
Sebago borders Bridgton, Naples, Baldwin, Standish, Denmark and Hiram. These are the ones we also cover, each with its own energy code and permit rule:
Elsewhere in Cumberland County we also cover:
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.
| City | Energy code | Attic R required | Permit to insulate | Building dept. |
|---|---|---|---|---|
| Sebago | Not published | — | Not published | 207-787-2457 |
| Bridgton | Maine code, 2021 IECC | R-60 | Not for an attic top-up | 207-803-9963 |
| Naples | Not published | — | Not published | 207-693-6364 |
| Baldwin | Not published | — | Not for an attic top-up | 207-625-3581 |
| Standish | Maine code, 2021 IECC | R-60 | Not published | 207-642-4571 |
| Casco | Maine code, 2021 IECC | R-60 | Not published | 207-627-4515 |
| Raymond | Maine code, 2021 IECC | R-60 | Not published | 207-655-4742 |
All 25 Cumberland County jurisdictions side by side →
Sebago does not publish the energy code edition it enforces, so we do not state a required figure here. The Department of Energy recommends R60 for an uninsulated attic in this climate zone and R49 where there are already a few inches.
Not on paper: Sebago names neither a permit nor an exemption for insulation, so one call to the department at 207-787-2457 settles it first.
The statewide Efficiency Maine rebates: $2,000 to $4,000 per insulated zone of 500 square feet or more, by income tier, and $150 to $300 for attic air sealing; the work has to be done by a Residential Registered Vendor and the attic has to start at R-21 or less. The federal 25C credit ended for work placed in service after December 31, 2025.
The typical home in Sebago dates to around the mid-1970s; the Census Bureau's 2020-2024 median year built is 1975. Of its 1,521 homes, 17% went up before 1940 and 20% in 2000 or later. Half the homes here are older than that and half newer; yours may sit at either end.
Code and permit facts checked October 24, 2026, rebates October 24, 2026; housing: Census ACS 2020–2024. Sources: web.archive.org (2, 3, 4) · townofsebago.org (2, 3, 4, 5) · legislature.maine.gov · www2.census.gov · maine.gov · en.wikipedia.org · 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 207-787-2457 or Efficiency Maine at 866-376-2463 first.
Free assessment, measured at the hatch, with the photographs and the number in writing.
Book my free assessment →