Insulation in Biddeford, Maine

Insulation and air sealing in Biddeford

Biddeford runs to about 30 square miles and roughly 22,498 people. It sits about 17 miles southwest of downtown Portland. Around 10,502 housing units sit inside those boundaries. The community dates back to 1653. We cover ZIP codes 04005, 04006 and 04007.

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

The housing stock in Biddeford

The typical home in Biddeford dates to around the early-1950s. 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 Biddeford rather than one corner of it — Biddeford Pool, Hills Beach, Fortunes Rocks, Granite Point, Five Points, Fort Hill, Guinea Corner, Oak Ridge, Newtown and Timber Point 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.

Biddeford, the principal commercial center of York County, grew as a mill city: large textile mills such as the Laconia and Pepperell companies rose at the Saco River falls in the 1840s and 1850s, drawing Irish, Albanian and French-Canadian workers. Its ocean shore holds the seaside neighborhoods of Hills Beach, Biddeford Pool, Fortunes Rocks and Granite Point. The city's historic preservation ordinance covers exterior alterations in its designated downtown and mill-area historic districts.

Biddeford homes in the Census numbers

The Census Bureau estimates 10,502 homes in Biddeford. 4,270 of them (41%) went up before 1940 — the 3rd-highest share of pre-1940 housing among the 64 places on this site. More of today's homes date from before 1940 than from any single decade since, and 74% predate 1980. For York County as a whole the pre-1940 share is 20%, so Biddeford sits above it.

Of 9,204 occupied homes, 8% heat with utility gas and 12% with electricity; another 13% burn propane or other tank gas. Electric heat here is more common than across the county (10%), and ranks 20th 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.

48% of occupied homes are owner-occupied and 41% of all homes are single-family detached houses, with 147 mobile homes in the count. On a housing mix like this, the likely starting points are wall insulation for walls built empty and a vermiculite check before anything is disturbed.

10,502 homes, Census ACS 2020–2024 (B25034, B25040, B25003); 9,204 occupied.

Sealing comes first in Biddeford

2,683 of Biddeford's 10,502 homes (26%) 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.

What the energy code requires in Biddeford

Biddeford enforces the Maine Uniform Building and Energy Code (2021 IECC with Maine amendments). Biddeford's Code Enforcement page says the office follows the codes the state adopted, the 2021 energy code among them, although the city's own ordinance (Chapter 18, Section 18-76) still names the 2003 editions.

That edition sets R-60 for the attic in new work, and R-30, or R-20 + R-10 continuous, or R-13 + R-15 continuous, or R-20 continuous for walls. The Department of Energy's recommendation for this climate zone is no lower: R60 for an attic with nothing in it, R49 where a few inches are already down.

Table R402.1.3 of the 2021 IECC for climate zone 6, with the wall row as Maine rewrote it (08-003 C.M.R.

Do you need a permit to insulate here?

Nothing Biddeford publishes settles this. Its permit lists name the work types it cares about, and insulation is not among them in either direction. Biddeford's permit pages do not say whether insulation needs a permit; building permits cost a $60 application fee plus $15 per $1,000 of project value, and projects of $5,000 or less pay only the $60. 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 Biddeford

The published number is 207-284-9236. The department page is here.

Permitting is on us, not on you.

Rebates a Biddeford homeowner can actually use

In Biddeford, 64% of occupied homes heat with fuel oil or kerosene, 13% with propane or other tank gas and 12% with electricity, and 8% utility gas (Census ACS 2020–2024). Efficiency Maine pays the same rebates in Biddeford 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. Only a Residential Registered Vendor can do rebated work, the claim goes in within six months, and a lifetime limit of $8,600 per home applies. Income-qualified households in York County can apply to York County Community Action Corp (207-324-5762) for free weatherization through MaineHousing instead. The York County page and the rebate guide carry the full rules.

Nearby

Biddeford borders Saco, Dayton, Arundel, Kennebunkport, Saco River and Atlantic Ocean. These are the ones we also cover, each with its own energy code and permit rule:

Elsewhere in York County we also cover:

How Biddeford 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 Biddeford

Code and permit facts checked October 24, 2026, rebates October 24, 2026; housing: Census ACS 2020–2024. Sources: biddefordmaine.org (2, 3, 4, 5, 6) · ecode360.com (2, 3, 4) · maine.gov (2) · en.wikipedia.org (2) · pressherald.com · www2.census.gov (2) · prd-tnm.s3.amazonaws.com · efficiencymaine.com (2, 3, 4) · energystar.gov · data.census.gov. These change; confirm with the building department at 207-284-9236 or Efficiency Maine at 866-376-2463 first.