More homes in Brooklyn, Connecticut were built in the 2000s than in any other decade: 535, or 16.8% of the town’s 3,184 housing units. This is the Windham County town named for the Quinebaug River, or Brook Line, that forms its eastern boundary, incorporated in 1786 from parts of Canterbury and Pomfret. It has nothing to do with the borough in New York, and its housing is spread across every era.
The median unit dates from 1978. 14.8% of the stock predates 1940, 13.7% is from the 1940s and 50s, 24.8% from the 1960s and 70s, 24.6% from the 1980s and 90s and 22.0% from 2000 on; 53.3% was standing before 1980. 74.9% of units are detached houses, and 78.6% of occupied homes are owner-occupied.
Fuel oil heats 59.3% of occupied homes. Electricity heats 12.8%, wood 9.7%, bottled gas 9.2% and utility gas 7.2%. On oil or bottled gas, every leak sealed means fewer deliveries each winter, and more of them in an older, leakier house; on wood it means fewer cords. In a newer house the heating savings are smaller, and the stronger reason is usually comfort: the cold bonus room, the hot upstairs.
The houses we insulate in Brooklyn
Brooklyn was settled in the late 17th century on land that had belonged to the Wabaquasset. The National Register lists the Brooklyn Green and Bush Hill historic districts, Trinity Church, the Unitarian Meetinghouse and Putnam Farm; General Israel Putnam had a farm in Brooklyn, died there in 1790, and lies in the foundation of his 1888 statue near the green. A house of that age, one of 472 built before 1940, usually has empty walls, a sill that leaks where it meets the foundation, and an attic floor with little on it. We check for knob-and-tube wiring and have any live circuit evaluated before we fill a wall.
The Quinebaug Mill–Quebec Square Historic District marks Brooklyn’s mill history by the river. The town’s 172 units in two-unit buildings and 189 in three- and four-unit buildings share cellars, stairs and roofs, and we price each as a whole building.
The 1950s built 299 homes, the 1960s 338 and the 1970s 452: capes, ranches, raised ranches and split-levels. The cape leaks at its knee walls and the open joist bays below them. The raised ranch leaks at the above-grade rim around its lower level, at the ceiling of the garage under a bedroom, and through a long attic of thin, flattened fiberglass over unsealed plates and ceiling boxes.
The 460 homes of the 1980s and 324 of the 1990s are colonials, capes and contemporaries with insulated walls. Their losses are overhead and at the rim: pull-down stairs, recessed lights, bath fans, top plates, and cathedral ceilings with batts against the deck. The 85 units in buildings of fifty or more sit under a roof the owner or the association controls. The 77 mobile homes are different again: no walk-in attic and no ordinary stud cavity to fill, with the floor, the belly, the ducts and the skirting where the heat goes.
When the house went up after 2000
22.0% of Brooklyn has been built since 2000, including the 535 homes of the 2000s and 167 from the 2010s. Those houses have full walls and a respectable attic, and anyone offering to blow insulation into their walls is selling the wrong job. What goes wrong in them is different, and it is mostly air.
The bonus room over the garage is the most common complaint. Its floor sits over an unheated garage, often with batts that never touched the subfloor; its knee walls face an attic with no air barrier behind them; and its sloped ceiling is thin. The cure is to air-seal and fill the floor cavity, put an air barrier and insulation behind the knee walls, and baffle and fill the slopes.
Next come the ducts. Many houses of this era run their ducts, and sometimes the air handler, through a vented attic that is outside the insulation. Every leaky joint heats or cools the attic instead of the rooms, and sealing them is often worth more than adding depth. Then the rim joist, usually a batt pushed against the band in an unfinished basement, and the recessed lights, bath fans and attic hatch that pierce the ceiling.
A rebate note for these houses: the Energize CT rebate counts a rim joist only if it starts at R-6 or less, and a garage ceiling only if it starts at R-6 or less, so a bare rim may qualify while a bonus-room floor that already has batts may not. Our free estimate shows what is there.
We seal before we insulate
Insulation limits heat moving through a surface. Air moving through a gap goes straight past it, which is why a 2005 house with full walls can still have a cold room and a hot attic.
In a Brooklyn colonial with a bonus room the order runs: in the attic, seal the top plates, the light boxes, the bath fan housings and the duct boots, and weatherstrip the hatch; at the bonus room, block the joist bays under the knee walls, air-seal the garage ceiling and fill the floor cavity; in the basement, seal and insulate the rim joist all the way around. Only then does the attic get more depth, if it needs it.
If a quote specifies a depth of insulation and never mentions air sealing, it is half a job.
What insulation costs in Brooklyn
Most of our projects run between $3,500 and $12,500. A post-2000 colonial is priced on the bonus room, the rim joist, the attic sealing and any duct work, and it often lands toward the lower end. A 1970s raised ranch is priced on its attic, the lower-level rim and the garage ceiling. A house on the green or in Bush Hill is priced mostly on its walls, and a two- or three-family on the whole building.
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 Brooklyn
Eversource is Brooklyn’s electric company, and also its gas company where mains run. An Eversource account is therefore how Brooklyn households reach Energize Connecticut: Home Energy Solutions is open to customers of Eversource, United Illuminating, Connecticut Natural Gas and Southern Connecticut Gas, whatever fuel heats the house. It is for homes of one to four units; renters need the landlord’s approval, and a home served within the past six years is not yet eligible again.
The standard Home Energy Solutions visit costs a $40 copay, effective 1 April 2026, and is carried out by the program’s authorized contractor. It opens with health and safety tests, uses a blower door to pinpoint drafts and air leaks, tests the ducts in a house with forced hot air or central air conditioning, which matters in a post-2000 house with ducts in the attic, and includes up to seven hours of air sealing at no cost, then $10 an hour. There may be a waiting list, and the program is subject to available 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, to a maximum of $10,000, for attic floors, floored-over attics, walls, basement and garage ceilings and rim joists. Foam on the underside of a roof deck is not on the list; ask the program before counting on a rebate there. The steps are fixed: the insulation is recommended during a Home Energy Solutions visit, approved before installation, and installed by an approved contractor from the Energize CT Insulation Installers Network. Part of Brooklyn is designated an environmental justice community; the state’s map shows whether a specific address qualifies, and a qualifying home can receive up to $2.50 per square foot, up to $15,000.
Income decides the tier. On Energize CT’s 2026–2027 figures the Income Eligible line is $78,692 for a household of three and $93,681 for four, with no-cost service and up to 100 percent of insulation costs covered. Enhanced Incentives runs to $104,924 for three and $124,908 for four, by default and adjusted by zip code, with a no-cost visit and up to $2.50 per square foot. Above those, the standard tier applies. Ask which tier you are in before you pay the copay.
The rebate is paid only on work by the program’s network installers, so ask whoever quotes, including us, whether they are in that network, and compare the prices after any rebate. The Connecticut Green Bank’s Smart-E Loan finances insulation with no money down, up to $50,000, on an owner-occupied Connecticut home of one to four units: 6.99% APR over 5, 7 or 10 years, 7.49% over 12 and 7.99% over 15 where the lender offers that term. A Home Energy Solutions visit is suggested but is not a requirement for Smart-E, and the loan is arranged through the Green Bank’s participating contractors, so ask whether yours participates. There is no federal tax credit for insulation installed in 2026: Section 25C ended for anything placed in service after 31 December 2025. Our Connecticut rebate guide has the full picture.
Code and climate in Brooklyn
53.3% of Brooklyn’s housing was built before 1980. Brooklyn is in climate zone 5A, as is all of Connecticut.
Today, new homes and additions with applications filed since 1 October 2022 follow the 2022 Connecticut State Building Code, which adopts the 2021 IECC with Connecticut amendments. The ceiling target is R-60, met by R-49 where that depth runs uncompressed over the wall top plate at the eaves. Wood-frame walls need R-30 in the cavity, R-20 cavity plus R-5 continuous, R-13 plus R-10 continuous or R-20 continuous. A floor over a garage or other unheated space needs R-30; basement walls need R-15 continuous, R-19 cavity or R-13 cavity plus R-5 continuous; windows need U-0.30. A new home must pass a blower-door test at 3.0 air changes per hour at 50 pascals on the prescriptive path, and never worse than 5.0. Connecticut’s next code, based on the 2024 IECC, has been adopted in draft, but its effective date has been delayed.
Common questions about insulation in Brooklyn
Do you install insulation in Brooklyn, CT?
Yes, in Brooklyn, Connecticut, from Brooklyn Center and the green to East Brooklyn, Quebec, West Village, Bush Hill, Tatnic Hill and the other villages. Much of the work is the houses built since 1980, including the 535 from the 2000s, where bonus rooms, attic ducts and rim joists are the targets, plus the raised ranches of the 1960s and 70s and the older houses of the historic districts. If you are looking for Brooklyn, New York, that is a different place.
How much does insulation cost in Brooklyn?
Most projects run $3,500 to $12,500. A post-2000 house is usually priced on its bonus room, rim joist, attic sealing and ducts, and often lands toward the lower end. A raised ranch depends on the attic area, the rim around the lower level and the garage ceiling. An older house near the green is priced mostly on its walls. We walk the house at no charge and put the scope and price in writing before anyone starts.
Are there insulation rebates in Brooklyn?
Yes, through Energize Connecticut. Brooklyn is Eversource for electricity and gas, and oil-, wood- and propane-heated homes sign up through the electric account. The Home Energy Solutions visit is $40 on the standard tier. Insulation recommended there, approved first and installed by an Energize CT Insulation Installers Network contractor can earn up to $2.00 per square foot or 75 percent of cost, whichever is less, to $10,000, more in the part of town designated an environmental justice community. A rim or garage ceiling must start at R-6 or less. No federal credit applies in 2026.
The bonus room over our garage is cold in winter and hot in summer. What fixes it?
Usually three things together. The floor over the garage often has batts that sag away from the subfloor, so cold garage air moves through the cavity; we air-seal the garage ceiling and fill the cavity completely. The knee walls face an attic with no air barrier, so we add one and insulate behind them, blocking the joist bays underneath. The sloped ceiling gets baffles and fill. Sealing the garage ceiling also keeps car exhaust out of the room above, and a duct run to the room may need sealing too.
Free estimate in Brooklyn
Our free estimate is a walk-through, separate from the Home Energy Solutions visit, and it does not qualify anyone for a rebate. In a post-2000 house we start at the bonus room, its floor, knee walls and slopes, then go to the attic for the ducts, lights and plates, and down to the rim joist. In an older house we look into the walls and the sill. You get a written scope and a price, with no charge.
Call 914-825-6824, 8am–8pm, seven days a week, or use the contact form. We work out of New Rochelle, NY, and our 100-plus in-house crew does the work; we never subcontract.
Learn more
- Insulation contractors across Windham County
- Putnam, the town named for the general buried in Brooklyn
- Killingly and Danielson, where many Brooklyn students attend high school
- Woodstock, Connecticut, home of Woodstock Academy
- Garage and bonus room insulation
- Spray foam insulation