Attic insulation, air sealing, crawl spaces and walls for homes in Baldwin — starting with a free assessment that measures the R-value you actually have. The typical home here dates to the late-1970s, and 15% of its 634 homes went up before 1940.
Baldwin runs to about 35 square miles and roughly 1,170 people. It sits about 27 miles northwest of downtown Portland. That is roughly 634 housing units. The community dates back to 1802. We cover ZIP codes 04024 and 04091.
Our job history shows nothing in Baldwin so far. Plenty of sites will show you a number here anyway.
The typical home in Baldwin dates to around the late-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 Baldwin rather than one corner of it — East Baldwin, West Baldwin, North Baldwin and Cornish Station 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 town in the Saco River valley, once known for its apple orchards, with an apple-drying factory in East Baldwin. Sebago was split off from it in 1826.
The Census Bureau estimates 634 homes in Baldwin. 95 of them (15%) went up before 1940 — 39th of 64 places on this site for pre-1940 housing. The 1970s were the busiest decade, adding 164 of today's homes (26%); 52% predate 1980 and 28% were built in 2000 or later. For Cumberland County as a whole the pre-1940 share is 23%, so Baldwin sits below it.
Of 527 occupied homes, 0% heat with utility gas and 5% with electricity; another 12% burn propane or other tank gas. Electric heat here is less common than across the county (15%), and ranks 49th of 64 on this site. The heating fuel does not change the Efficiency Maine rebate, but it does change what each inch of insulation is worth, which is why the boiler, furnace or heat pump is the first thing an assessment looks at.
89% of occupied homes are owner-occupied and 79% of all homes are single-family detached houses, with 101 mobile homes in the count. Read together, those numbers point toward an attic top-up over postwar fiberglass.
| Built | Homes | Share | |
|---|---|---|---|
| Before 1940 | 95 | 15% | |
| 1940s | 4 | 1% | |
| 1950s | 62 | 10% | |
| 1960s | 3 | 0% | |
| 1970s | 164 | 26% | |
| 1980s | 48 | 8% | |
| 1990s | 82 | 13% | |
| 2000s | 111 | 18% | |
| 2010s | 51 | 8% | |
| 2020 or later | 14 | 2% |
634 homes, Census ACS 2020–2024 (B25034, B25040, B25003); 527 occupied.
130 of Baldwin's 634 homes (21%) 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.
Baldwin does not publish the energy code edition it enforces, so this page does not name one. Baldwin had 1,520 residents in 2020, under the 4,000 at which a town must enforce the state code, and its posted pages do not tie it to the 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.
Section 4.2 B of Baldwin's Land Use Ordinance says no permit is needed for repairs or improvements that involve no structural change when the reasonable cost is under $25,000; above that, the fee schedule charges $8 per $1,000.
The published number is 207-625-3581. The department page is here.
Permitting is on us, not on you.
In Baldwin, 64% of occupied homes heat with fuel oil or kerosene, 12% with propane or other tank gas and 5% with electricity (Census ACS 2020–2024). Efficiency Maine pays the same rebates in Baldwin as anywhere else in the state: $2,000 per attic, wall or basement zone with 500 square feet or more insulated at any income, $3,000 for a verified moderate-income household and $4,000 for a low-income one, plus $150 to $300 for sealing the attic's air leaks. 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
Baldwin borders Sebago, Standish, Hiram, Cornish, Limington and Saco River. 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. |
|---|---|---|---|---|
| Baldwin | Not published | — | Not for an attic top-up | 207-625-3581 |
| Sebago | Not published | — | Not published | 207-787-2457 |
| Standish | Maine code, 2021 IECC | R-60 | Not published | 207-642-4571 |
| Cornish | Not published | — | Not published | 207-653-4608 |
| Limington | Maine code, 2021 IECC | R-60 | Not published | 207-637-5209 |
| Bridgton | Maine code, 2021 IECC | R-60 | Not for an attic top-up | 207-803-9963 |
| Brunswick | Maine code, 2021 IECC | R-60 | Not published | 207-725-6660 |
All 25 Cumberland County jurisdictions side by side →
Baldwin 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.
Section 4.2 B of Baldwin's Land Use Ordinance says no permit is needed for repairs or improvements that involve no structural change when the reasonable cost is under $25,000; above that, the fee schedule charges $8 per $1,000.
Efficiency Maine's: $2,000 per attic, wall or basement zone of 500 square feet or more at any income, $3,000 at moderate income and $4,000 at low income, plus $150 to $300 for attic air sealing, on work completed by one of its Residential Registered Vendors on or after October 1, 2026. The federal 25C credit ended for work placed in service after December 31, 2025.
The typical home in Baldwin dates to around the late-1970s; the Census Bureau's 2020-2024 median year built is 1979. Of its 634 homes, 15% went up before 1940 and 28% in 2000 or later. It is a median for the place, not a survey of individual houses.
Code and permit facts checked October 24, 2026, rebates October 24, 2026; housing: Census ACS 2020–2024. Sources: baldwinmaine.org (2, 3, 4, 5, 6) · townofnaples.org · 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 207-625-3581 or Efficiency Maine at 866-376-2463 first.
Free assessment, a measured R-value, and photos you keep either way.
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