Attic insulation, air sealing, crawl spaces, rim joists and walls across the whole metro: 45 cities and jurisdictions on the Missouri side and in the Metro East. It starts with a free assessment that measures the R-value you actually have.
We are not a remodeler that also blows attics. Every crew and every truck here points at one thing — across greater St. Louis, from the city out to Franklin County and across the river into the Metro East.
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.
The coldest floor in a St. Louis house is usually over a vented crawl space. We fix the rim joist first, because that is where the air is actually moving.
Pre-war St. Louis brick and frame houses were built with nothing in the walls. Dense-pack goes in through small holes and comes back out as a wall that does not radiate cold.
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.
This is the strangest thing about insulating a house in this metro, and almost nobody tells you. Two houses of the same age, twenty minutes apart, get completely different money for exactly the same work — because one is an Ameren Missouri customer and the other is an Ameren Illinois customer, and the two states regulate efficiency programs differently.
We check which one applies to your address before quoting and tell you what that program asks for. Both run the work through contractors enrolled in the program — Program Allies on the Illinois side, the program's own partners inside Pay As You Save on the Missouri side — and the guide sets out each step.
Read the full rebate guide →attic insulation on Ameren Illinois' 2026 discount table. Wall insulation the same, $2.50 per linear foot rim joist, $3.75 per linear foot crawl space wall, $0.70 per cubic foot per minute (CFM) of air leakage reduced for air sealing. Taken off a registered Program Ally's price following a home energy assessment, not mailed to you.
ceiling and attic insulation inside the Pay As You Save program, the 2026 program year — but only where the attic starts at R-20 or below and reaches R-38. The incentive lowers the cost of the work; the rest is repaid through a monthly charge on the electric bill, and that charge cannot exceed 80% of the estimated saving. For income-eligible households, CommunitySavers can include attic insulation at no charge instead.
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 Lambert put 84.9 nights a year at or below freezing, but only 19.3 days that never climb back above it. Most St. Louis freezes thaw the same day.
That daily swing is what makes an under-insulated, under-sealed attic here different from one in Minnesota. Warm wet air pushes up through the ceiling all night, hits cold sheathing, condenses, and then everything warms up and dries just enough that nobody ever sees it — until the plywood is dark and the batts are matted flat. And in a zone 4A summer, the same missing insulation runs the other way through 1,713 cooling degree days.
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.
Neither Missouri nor Illinois licenses insulation contractors at state level. What does exist is municipal contractor registration — a good number of metro cities require it before a permit is pulled — and utility program enrollment, which decides whether a program discount can be applied to the job. Each city page says what that city publishes about registration.
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. In Missouri those change from one side of a street to the other.
See every city we cover →
Free assessment, a measured R-value, and photos you keep either way.
Book my free assessment →