Attic insulation, air sealing, basements, rim joists and walls across Cumberland, York and Sagadahoc counties: 64 towns and cities from Kittery to Bath and inland to the Sebago Lake towns. It starts with a free assessment that measures the R-value you actually have.
One trade: insulation and air sealing, across greater Portland and southern Maine, from the Casco Bay islands to the York County coast and the lake towns.
The one that pays for itself first. We measure what is up there, air seal the ceiling plane underneath it, then blow to a depth we mark on a ruler you can see from the hatch.
Insulation slows heat. It does not stop air. Sealing the top plates, chases and penetrations before insulating is the difference between a warm house and a deep pile of fiber.
Efficiency Maine's own advice is that cold air usually comes into a house low, through the basement, and leaves through the attic. We seal and insulate the rim joist and sill first, because that is where it gets in.
No Maine house built before June 2010 was held to a state energy code, Efficiency Maine points out, so the walls hold whatever the builder chose. Dense-pack goes in through small holes and fills what is empty.
Rodent-contaminated, water-damaged or simply exhausted. It comes out under negative pressure into sealed bags, and the deck gets treated before anything new goes down.
Before anything is quoted: what R-value you actually have, where the air is going, and what the fix is worth. A written report with photographs, yours whether you hire us or not.
We measure the R-value you actually have before quoting anything, and we hand you the number in writing.
The sealing goes in before the insulation, never after — this is what a properly insulated attic is built from, and what to look for, line by line, in any written quote.
Efficiency Maine, the state's independent efficiency trust, pays the insulation and air sealing rebates for Maine homes, whichever utility sends the bill. What it pays turns on two things: the household's income tier and how many square feet of each zone get insulated.
The rebate is paid only when one of its Residential Registered Vendors does the work to its own checklist, and the claim goes in within six months of the job. Low- and moderate-income tiers need the household verified first. We work out which tier and which zones apply before quoting.
Read the full rebate guide →for each attic, wall or basement zone with 500 square feet or more insulated: $2,000 at any income, $3,000 moderate income, $4,000 low income (250–499 square feet: $1,000 to $2,000). Up to $8,600 per home for life, on upgrades completed on or after October 1, 2026.
for sealing all the accessible air leaks in the attic, by income tier, with smaller amounts for the basement and the living space. One air sealing rebate per zone.
The 30% Energy Efficient Home Improvement Credit is not available for work placed in service in 2026. Anyone still quoting it as part of your price is quoting something that no longer exists.
Four steps, and you know what is happening at each one. No surprise change orders, no crew that opens up a crawl space and disappears for a week.
We get in the attic and the crawl space, measure what is really there, run the infrared, and send you the whole set of photographs — yours to keep, hire us or not.
One line-itemed proposal: what gets sealed, what gets insulated, the R-value we are building to, and which program, if any, your address qualifies for. One number, and it is the number.
Floors and stairs protected, hoses run on drop cloths, and the depth marked on a ruler at the hatch so you can check the job yourself from the ladder.
A blower-door number before and after where the job called for one, and photographs of the finished depth.
NOAA's 1991–2020 normals for the Portland Jetport put 6,795 heating degree days in a year against 447 for cooling, and 144.1 nights at or below freezing. An attic here works for the furnace, the boiler or the heat pump, not the air conditioner.
Efficiency Maine explains what that does to a house: warm air leaks into the attic and melts the snow on the roof, the water refreezes at the cold edge, and the ice dam that forms can push water back under the shingles and down into ceilings and walls. It calls roof raking hard to keep up with and heat tape expensive to run, and says weatherizing the house can eliminate ice dams: seal the attic's air leaks, then add insulation.
Have someone look at it →Somebody comes out, gets in the attic and under the floor, measures what is there and finds where the air is going. Takes about an hour, and you get the report whether or not you hire us.
We look up the house, the vintage and the code that applies in your jurisdiction before anyone knocks on the door.
Depth, material, condition, and the ceiling plane underneath it. Infrared where the picture needs it.
Current R-value, target R-value, the cost, and which rebate program, if any, your address qualifies for.
Maine does not license insulation contractors. What it does require is a written contract for any home job over $3,000, with no more than one-third down and the statutory warranty, and Efficiency Maine pays its rebates only on work by one of its Residential Registered Vendors. Each town page says what that town's code office publishes.
Every city below has its own page with the energy code that jurisdiction actually enforces, the R-value it requires, whether an attic job needs a permit there, and the building department's own number.
See every city we cover →
Free assessment, a measured R-value, and photos you keep either way.
Book my free assessment →