10.3% of Thomaston’s 3,328 housing units, 344 homes, are in buildings of five to nine units, and another 142 sit in buildings of ten to nineteen. Detached houses still make up 71.9% of the town, but that leaves a real block of homes whose roofs and walls are not controlled by the people living under them.
The median home dates from 1962. 26.5% of the stock predates 1940 and 21.8% comes from the 1940s and 50s, including 568 homes from the 1950s alone. After that, 16.7% dates from the 1960s and 70s, 20.9% from the 1980s and 90s and 14.1% from 2000 on, with 399 homes added in the 2000s against 172 in the 1990s. In all, 65.0% of Thomaston’s housing predates 1980, and 80.8% of occupied homes are owner-occupied.
Fuel oil or kerosene heats 49.1% of occupied homes, utility gas 24.4% and electricity 14.9%, with bottled gas at 5.5%. Sealing pays the same way whichever fuel it is: in what never gets burned. An oil house sees it in the tank, a gas house on the monthly bill.
The houses we insulate in Thomaston
Thomaston was Plymouth Hollow, part of the town of Plymouth, until it incorporated under its own name in 1875. Eli Terry set up a clock factory there in 1803, and the town is named for Seth Thomas, who opened his in 1812; the Seth Thomas factory building still stands. The town lies in southeastern Litchfield County on Waterbury’s northern border, where the Naugatuck River, Northfield Brook and Black Rock Brook meet, and the Route 8 expressway follows the river through the east side of town. Reynolds Bridge, Downtown, Highwood Farms, Hickory Hill and High Street Ext are its principal communities.
The flood of 1955 ravaged the town, and in the years after it the U.S. Army Corps of Engineers built flood control dams on all three watercourses. The dams manage the rivers, not groundwater, and a cellar on low ground can stay damp for reasons no dam touches. Among the 883 homes built before 1940, the cellar is often stone or old block with the sill resting low on it and gapped floorboards overhead. Closed cell foam on that rim and sill takes no harm from damp; a wall that actually takes on water stays uninsulated until the water is dealt with.
The 568 homes of the 1950s, the busiest decade since 1940, were mostly insulated once and never again. That first layer, often loose mineral wool or a thin paper-faced batt, has been packed down by storage boxes, roof leaks and electricians for seventy years. Beneath it, light fixtures pierce the plaster ceilings, and the tops of the walls are open at the plate.
The 522 homes of the 1980s and 399 of the 2000s have insulated walls, and their losses tend to be hidden. A finished basement is the usual one: the rim joist was covered with drywall or a dropped ceiling before anyone sealed it, so cold air runs along the top of the foundation behind a room that looks complete. Getting to that rim means working through the ceiling tiles or small openings, and it is worth doing.
Condominiums and the five-to-nine-unit building
In a building of five to nine units, whether its homes are owned as condominiums or rented, the roof, the attic, the outside walls and usually the foundation are shared. One owner cannot insulate them alone, and the association or landlord decides what happens to them.
A unit owner still has work of their own. Pipes and wires pass through the walls and floors shared with neighbors, and those holes carry air, sound and odors between units; sealing them happens inside the unit, along with the bath and kitchen fan housings and, on a top floor, the gaps in the ceiling. The attic above that ceiling is common property and waits for the association.
For an association, the building is one job. The attic over several units is sealed and insulated as a single space, the walls that separate units are checked where they meet the roof, and the rim joist is sealed along the whole foundation.
The programs draw their own line at four units. Energize CT describes Home Energy Solutions as suited to homes of one to four units and points owners of apartment buildings of five or more to its Multifamily Initiative, so a condominium owner in a larger building should ask which applies. Smart-E requires a condominium to be individually metered.
We seal before we insulate
Air moving through a gap carries heat out far faster than heat can soak through the insulation beside it. That is the reason the gaps come first.
In a Thomaston house of the 1950s the order is: pull the old mineral wool back from the eaves and the tops of the walls; seal the top plates, the fixture holes in the plaster ceilings, the chimney and the plumbing stack; weatherstrip and insulate the hatch; set baffles at the eaves; then blow new insulation over the old. In the cellar, seal and insulate the rim and sill, and close the holes where pipes and flues rise into the house.
If a quote specifies a depth of insulation and never mentions air sealing, it is half a job.
What insulation costs in Thomaston
Most of our projects run between $3,500 and $12,500. A 1950s house is priced on its attic area, how much old fill has to be moved to reach the top plates, and the length of the cellar rim. A newer house with a finished basement adds the work of reaching a hidden rim. A condominium or small apartment building is priced as a whole building once the association or owner agrees on the scope.
Open cell foam runs R-3.9 to R-4.2 per inch. Closed cell runs R-6.9 to R-7.1 per inch and also acts as a vapor retarder, which is why it costs more and why it is right in some assemblies and unnecessary in others. All products are manufactured in the United States and meet applicable building code and safety standards. ENERGY STAR says sealing air leaks and adding insulation can save up to 10% on annual energy bills.
Insulation rebates in Thomaston
Eversource is Thomaston’s electric utility and its gas utility. Home Energy Solutions, Energize Connecticut’s home assessment, is open to customers of Eversource, United Illuminating, Connecticut Natural Gas and Southern Connecticut Gas, whatever fuel heats the house, so an oil-heated home can apply with its electric account and a gas-heated one with either. A home the program served within the last six years has to wait, and a renter needs the landlord’s approval.
The copay for the standard visit has been $40 since 1 April 2026. The authorized contractor starts with health and safety testing, uses a blower door to find the drafts, tests the ducts where there is forced hot air or central air conditioning, and may leave low-flow showerheads and faucet aerators. Seven hours of air sealing are part of the visit at no charge; a bigger or older house that needs more pays a $10 hourly fee. Properties of two to four units always receive two visits. Demand can create a waiting list, and the program lasts as long as its funding.
The 2026 Energize CT insulation rebate pays up to $2.00 per square foot or 75 percent of the total cost, whichever is less, up to a maximum of $10,000, for attic floors, floored-over attics, walls, basement and garage ceilings and rim joists. A rim joist counts when it starts at R-6 or less and ends at R-13 or better. The program requires three things, in this order: a Home Energy Solutions visit that recommends the insulation, approval of the project before installation, and installation by an approved contractor from the Energize CT Insulation Installers Network. Foam sprayed on the underside of a roof deck is not a qualifying area, so get the program’s answer first.
For a household of three, Energize CT’s 2026–2027 figures set Income Eligible at $78,692 or less, with no-cost service and up to 100 percent of insulation costs covered. Enhanced Incentives runs from $78,693 to $104,924 by default, with a no-cost visit and up to $2.50 per square foot, and your zip code sets the actual range. The standard program starts at $104,925. Confirm the tier before paying a copay.
The rebate requires a contractor from the Insulation Installers Network, so put the question to every installer who bids, us included, and compare prices after any rebate. Capital for Change’s Energize CT Micro Loan offers up to $3,000 at 0 percent interest for 36 months, payable on the utility bill, to Eversource or UI customers who own and live in a home of one to four units, condominiums among them; the work must be recommended through Home Energy Solutions and put in by an approved contractor, and credit approval applies. The Connecticut Green Bank’s Smart-E Loan reaches $50,000, no money down, at 6.99% APR for 5, 7 or 10 years, 7.49% for 12 and 7.99% for 15 where the lender offers it, through participating contractors. HER and HEAR, the federal home energy rebates, are not available in Connecticut, and Section 25C ended for anything placed in service after 31 December 2025, so no federal tax credit is available for insulation installed in 2026. Each program is explained in our Connecticut rebate guide.
Code and climate in Thomaston
65.0% of Thomaston’s housing was built before 1980. The town is in climate zone 5A, the zone the code assigns to all eight Connecticut counties.
A new home or addition whose application was filed from 1 October 2022 is built to the 2022 Connecticut State Building Code, the 2021 IECC with Connecticut’s amendments. Its ceiling requirement is R-60, and R-49 satisfies it when the full, uncompressed depth runs over the wall top plate at the eaves. Wood-frame walls need R-13 cavity insulation plus R-10 continuous, R-20 cavity plus R-5 continuous, R-30 in the cavity, or R-20 continuous. Floors call for R-30, basement walls for R-13 cavity plus R-5 continuous, R-19 cavity, or R-15 continuous, and windows for U-0.30. On the prescriptive path, a new home’s blower-door result may not exceed 3.0 air changes per hour at 50 pascals, and no compliance path accepts more than 5.0. The next Connecticut code, based on the 2024 IECC, has been adopted in draft; its effective date has been delayed.
Common questions about insulation in Thomaston
Do you install insulation in Thomaston, CT?
Yes, in Downtown, Reynolds Bridge, Highwood Farms, Hickory Hill, High Street Ext and every other part of town. Most of the work is the 1950s houses with their original thin attic layer, the prewar houses with damp stone cellars, and the newer homes with finished basements hiding an unsealed rim. Condominium and apartment buildings are scoped whole, with the association or owner.
How much does insulation cost in Thomaston?
Most projects run $3,500 to $12,500. A 1950s house turns on its attic area, how much old fill has to be moved to reach the plates, and the cellar rim. A finished basement adds the work of opening a way to the rim. A multi-unit building is priced for the whole building once the association or owner settles the scope. We look first, at no charge, and put the price in writing.
Are there insulation rebates in Thomaston?
Yes. Eversource provides both electricity and gas in Thomaston, and Home Energy Solutions takes a home on any fuel for a $40 standard copay. The 2026 Energize CT rebate is worth up to $2.00 per square foot or 75 percent of cost, whichever is lower, with a $10,000 cap, after a visit has recommended the insulation, the project has been approved and a network contractor puts it in. Condominium owners in buildings of five or more units should ask the program which offering applies. Insulation installed in 2026 carries no federal tax credit.
We own a condominium in a Thomaston building of several units. What can we insulate?
Start with what is yours. Inside the unit, the holes where pipes and wires pass into shared walls and floors can be sealed, along with fan housings and, on a top floor, the gaps in the ceiling below the attic. The attic, roof, outside walls and foundation are usually common property, so those go through the association and are done for the whole building. Read the association’s documents or ask the board before any work begins.
Free estimate in Thomaston
Our free estimate is a visit of our own, kept separate from the Home Energy Solutions program, and it creates no rebate eligibility. In a 1950s house we pull back the old fill at the eaves to see the plates, then go to the cellar rim. In an older house we look at the sill, the stone and any sign of water. In a newer house we find a way to the rim behind the finished basement. For an association, we walk the whole building. The written scope and price are free.
Call 914-825-6824 on any day of the week between 8am and 8pm, or use the contact form. Our base is New Rochelle, NY, and the 100-plus in-house crew that does the work never hands a job to a subcontractor.
Learn more
- All of Litchfield County
- Plymouth, the town Thomaston was once part of
- Watertown, to the southwest
- Litchfield, to the north
- Basement and rim joist insulation
- Open cell and closed cell foam
- What spray foam costs