Insulation and air sealing for West Bath 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 early-1980s, and 12% of its 1,039 homes went up before 1940.
West Bath runs to about 12 square miles and roughly 1,863 people. It sits about 25 miles northeast of downtown Portland. That is roughly 1,039 housing units. The community dates back to 1844. We cover ZIP code 04530.
Our job history shows nothing in West Bath so far. Plenty of sites will show you a number here anyway.
The typical home in West Bath 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.
Homes are spread across the town rather than gathered in a village, older homes often sit along the New Meadows shore facing the water, and several coves hold historic summer cottage colonies.
We work across West Bath rather than one corner of it — Foster's Point, Quaker Point, Birch Point, Mill Cove, Merritt Island and Winnegance 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.
West Bath sits on part of a peninsula between Bath and the salt-water New Meadows River, which separates it from Brunswick and Harpswell. Early homes were built along the shore, often with the front door facing the water, and waterfront homes are still the most sought after. It has no downtown or village center and works as a commuter town for Bath Iron Works and Brunswick, and seasonal cottages have been turning into year-round homes.
The Census Bureau estimates 1,039 homes in West Bath. 128 of them (12%) went up before 1940 — 50th of 64 places on this site for pre-1940 housing. The 1980s were the busiest decade, adding 200 of today's homes (19%); 44% predate 1980 and 18% were built in 2000 or later. For Sagadahoc County as a whole the pre-1940 share is 27%, so West Bath sits below it.
Of 814 occupied homes, 1% heat with utility gas and 14% with electricity; another 13% burn propane or other tank gas. Electric heat here is more common than across the county (11%), and ranks 12th 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.
82% of occupied homes are owner-occupied and 90% of all homes are single-family detached houses. Read together, those numbers point toward the attic, which is where most houses here start.
| Built | Homes | Share | |
|---|---|---|---|
| Before 1940 | 128 | 12% | |
| 1940s | 84 | 8% | |
| 1950s | 31 | 3% | |
| 1960s | 39 | 4% | |
| 1970s | 176 | 17% | |
| 1980s | 200 | 19% | |
| 1990s | 189 | 18% | |
| 2000s | 155 | 15% | |
| 2010s | 33 | 3% | |
| 2020 or later | 4 | 0% |
1,039 homes, Census ACS 2020–2024 (B25034, B25040, B25003); 814 occupied.
389 of West Bath's 1,039 homes (37%) 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.
West Bath does not publish the energy code edition it enforces, so this page does not name one. West Bath had 1,910 residents in 2020 and is not required to enforce the state code; its pages do not tie the town to it. 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.
There is no published answer for West Bath. Neither the permit-required list nor the exemption list mentions insulation or air sealing at all. West Bath's Land Use Ordinance makes it unlawful to alter a structure without first applying to the Planning Board or Code Enforcement Officer, and it defines an alteration as any change in construction that is not an addition. That silence is not permission and it is not a prohibition. We settle it with a phone call before the crew is scheduled.
The published number is 207-443-4342. The department page is here.
Permitting is on us, not on you.
52% of the occupied homes in West Bath burn fuel oil or kerosene for heat, 14% use electricity and 13% propane or other tank gas (Census ACS 2020–2024). Efficiency Maine pays the same rebates in West Bath 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. It applies to work completed on or after October 1, 2026 by one of its Residential Registered Vendors, and an attic qualifies only if it starts at R-21 or less. Income-qualified households in Sagadahoc County can apply to Kennebec Valley Community Action Program (207-859-1500) for free weatherization through MaineHousing instead. The Sagadahoc County page and the rebate guide carry the full rules.
Every layer of an insulated attic, explained
West Bath borders Bath, Phippsburg, Brunswick, Harpswell and New Meadows River. These are the ones we also cover, each with its own energy code and permit rule:
Elsewhere in Sagadahoc 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 1 of the 7 publishes a permit rule for insulation.
| City | Energy code | Attic R required | Permit to insulate | Building dept. |
|---|---|---|---|---|
| West Bath | Not published | — | Not published | 207-443-4342 |
| Bath | Maine code, 2021 IECC | R-60 | Not published | 207-443-8334 |
| Phippsburg | Maine code, 2021 IECC | R-60 | Yes | 207-389-2653 |
| Brunswick | Maine code, 2021 IECC | R-60 | Not published | 207-725-6660 |
| Harpswell | Maine code, 2021 IECC | R-60 | Not published | 207-833-5771 |
| Arrowsic | Not published | — | Not published | 207-295-4332 |
| Bowdoin | Not published | — | Not published | 207-250-2399 |
All 10 Sagadahoc County jurisdictions side by side →
West Bath 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.
West Bath has not published a rule for it; the building department at 207-443-4342 is called before the job starts.
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 West Bath dates to around the early-1980s; the Census Bureau's 2020-2024 median year built is 1983. Of its 1,039 homes, 12% went up before 1940 and 18% in 2000 or later. That is a median across the whole place, so your own house may be older or newer.
Code and permit facts checked October 24, 2026, rebates October 24, 2026; housing: Census ACS 2020–2024. Sources: westbath.org (2, 3, 4, 5, 6, 7, 8, 9, 10) · legislature.maine.gov · www2.census.gov · maine.gov · en.wikipedia.org (2) · zip-codes.com · efficiencymaine.com (2, 3, 4) · energystar.gov · data.census.gov. These change; confirm with the building department at 207-443-4342 or Efficiency Maine at 866-376-2463 first.
Free assessment, a measured R-value, and photos you keep either way.
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