37.6% of Norwich’s housing was built before 1940: 7,168 of its 19,057 units. The median unit dates from 1958. Detached houses are 43.9% of the city, while 13.0% of units are in two-unit buildings and 12.2% in buildings of three or four, and only 54.0% of occupied units are lived in by the people who own them.
So a large part of Norwich is rented, and nobody can sell a tenant an insulation job on walls the tenant does not own. The apartment buildings, from the 8.5% of units in buildings of five to nine up to the 4.6% in buildings of fifty or more, belong to landlords and associations, and what happens to a wall or a roof there is the owner’s or the board’s decision. What is ours is the owner who lives on one floor of a two- or three-family and holds the deed to all of it, the landlord who wants a house that costs less to heat, and the owner of a single-family house.
Heat is split three ways: utility gas warms 36.7% of occupied units, fuel oil 31.5% and electricity 26.3%. The gas and the electricity both come from Norwich Public Utilities, which the city owns, and no other Connecticut municipality has its own gas distribution system. That ownership decides which rebate program a Norwich house can use.
The houses we insulate in Norwich
By era, 37.6% of Norwich predates 1940, 14.9% is from the 1940s and 50s, 19.8% from the 1960s and 70s, 15.9% from the 1980s and 90s and 11.8% has been built since 2000. The 1970s, at 11.4%, built more of today’s city than any post-war decade.
Settlers from Saybrook Colony founded Norwich in 1659 around what is now the Norwichtown Green, and by the early 19th century the center had moved down to the harbor at Chelsea, where city hall, the courts and the large 19th-century urban blocks stand. Mills rose at the falls on the Yantic, Shetucket and Quinebaug, the largest the Ponemah Mill in Taftville. The neighborhoods still post their own boundary signs: Norwichtown, Bean Hill, Yantic, Taftville, Greeneville, Occum, East Great Plains, Thamesville, Laurel Hill and Chelsea.
The pre-1940 two- and three-family is the center of our Norwich work. Picture the usual one: an apartment on each floor of a wood-frame house, a common stair along one side, a porch at each level, and balloon-framed walls, so every stud bay is an open channel from the cellar sill to the attic. Those bays are usually empty, often behind siding laid over clapboard. The sill usually rests on stone, the top apartment sits under a shallow roof cavity, and the wiring is treated as knob-and-tube until someone has looked; live knob-and-tube is taken out of service before a wall is filled.
The 1950s added capes and ranches. A cape’s weak spot is the knee wall behind the upstairs bedrooms, insulated toward the room and open to cold air behind, over floor joists that run out to the eave. A ranch’s is a low attic of loose-fill settled thin, with a gap around every ceiling fixture and pipe. The 1970s added raised ranches and splits with a bedroom over the garage on an open floor, and in the city’s 1,096 attached single-family homes a party wall can run open into a shared attic.
Fuel sets the payback. In the 31.5% of homes on oil, the saving is counted in fewer deliveries over a winter. Under electric baseboard, every draft shows on the monthly bill.
Owners, tenants and the Norwich multi-family
In a Norwich two- or three-family the first question is who can say yes. The owner can, for the whole building, and the scope has to be the whole building, because the stair, the wall bays and the roof run past every apartment; sealing one floor leaves the air path open through the others. If you rent and your apartment is cold, call your landlord.
The second question is who pays for the heat. Where each apartment has its own utility account, the tenants’ bills fall and the building gets easier to rent. Where one boiler in the cellar heats every floor, the whole saving lands on the owner. Either way the work is priced once, for one building. And timing helps: 2,217 of Norwich’s units stood vacant, and an apartment between tenants, with nothing against the walls, is the easiest time to dense-pack them and seal the ceiling.
We seal before we insulate
Insulation slows heat conducting through a wall. It does not stop air, and in a balloon-framed house air is the bigger loss: each open stud bay works like a flue.
In a Norwich two- or three-family we work from the cellar up. Seal the rim where the sill meets the stone and close the bottoms of the wall bays. Over the top apartment, cap the tops of the bays and seal the top plates. Seal the stair hall ceiling and the plumbing stack, close the gap around the chimney with flashing and fire-rated caulk rather than foam, and block where porch roofs open into the walls. Then dense-pack the walls floor by floor and insulate over the top apartment.
If a quote specifies a depth of insulation and never mentions air sealing, it is half a job.
What insulation costs in Norwich
Most of our projects run between $3,500 and $12,500. For a pre-1940 Norwich two- or three-family, one price covers the building, and it moves with the stories of empty wall to dense-pack, how the bays are reached, the roof cavity over the top floor, and any knob-and-tube to retire first. Asbestos siding is never drilled; those walls are filled from inside. A 1950s cape or ranch is usually a smaller scope. See spray foam insulation cost for the foam side.
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 Norwich
Norwich’s electricity and gas come from Norwich Public Utilities (NPU), a municipal utility, and Energize Connecticut sends municipal utility customers to their own utility’s programs. Eversource’s own list of electric towns also names Norwich, without saying how much of the city, if any, it serves. The name on your electric bill settles which route below is yours.
NPU customers. NPU’s Home Energy Savings program is a free service for homes of one to four units, done by NPU’s contractor: a health and safety check with combustion and carbon monoxide testing, a blower door test to find and correct air leakage, a duct test, and LED and water-saving measures. NPU’s FY 27 insulation rebate pays up to $1.75 per square foot for attic insulation and $1.25 for wall insulation, for products purchased and installed from 1 July 2026 through 30 June 2027, with the form received by 15 July 2027. An attic must gain at least R-19 and finish at R-38; a wall must finish at R-13 in 2×4 framing or R-21 in 2×6. The lifetime maximum is $8,000, pre-approval is required above $5,000, the rebate cannot exceed actual cost, and the form requires a licensed insulation contractor. The Energize CT figures below do not apply to an NPU customer.
Homes billed by Eversource. Home Energy Solutions is open to customers of Eversource, United Illuminating, Connecticut Natural Gas and Southern Connecticut Gas, whatever fuel heats the house, for homes of one to four units without the program’s services in the last six years. An authorized Home Energy Solutions contractor does the visit for a $40 copay, in effect since 1 April 2026: health and safety tests, a blower-door test, a duct test where there is forced hot air or central air, and up to seven hours of air sealing at no cost, then $10 an hour. A two- to four-unit property takes two visits, and there may be a waiting list.
For such a home the 2026 Energize CT insulation rebate pays the lesser of $2.00 per square foot or 75% of the total cost, to a $10,000 cap, on attic floors, floored-over attics, walls, basement and garage ceilings and rim joists. Every address in Norwich is in a state-designated environmental justice community, which can raise the Energize CT insulation incentive to $2.50 per square foot, up to $15,000. It requires three things in order: a recommendation at the visit, program approval before installation, and installation by an approved contractor from the Energize CT Insulation Installers Network. Roof-deck foam is not a listed area; ask the program first. On Energize CT’s 2026–2027 figures for a household of four, $93,681 or less is Income Eligible, with up to 100% of insulation costs covered; $93,682 to $124,908 is Enhanced Incentives, a no-cost visit and up to $2.50 per square foot, with the range set by zip code; above that is the standard tier.
An Eversource-billed household should ask any installer who quotes, including us, whether they are in that network, and compare prices after that rebate. On either utility, an owner-occupied home of one to four units can use the Connecticut Green Bank’s Smart-E Loan: nothing down, up to $50,000, 6.99% APR across 5, 7 or 10 years, 7.49% across 12, 7.99% across 15 where offered. The Green Bank’s participating contractors arrange it; ask the contractor. No federal credit remains: Section 25C excludes anything placed in service after 31 December 2025, so 2026 insulation earns no federal tax credit. More in our Connecticut rebate guide.
Code and climate in Norwich
72.3% of Norwich’s housing was built before 1980. Like all of Connecticut, it is in climate zone 5A.
Anything new, a house or an addition filed since 1 October 2022, is held to the 2022 Connecticut State Building Code and its energy chapter, the 2021 International Energy Conservation Code with state amendments. Those rules set ceilings at R-60 (R-49 qualifies where it keeps its full uncompressed depth above the top plate at the eaves), floors at R-30 and windows at U-0.30. Wood-frame walls take R-30 in the cavity, R-20 plus R-5 of continuous insulation, or R-13 plus R-10; basement walls take R-15 continuous, R-19 in the cavity, or R-13 plus R-5 continuous. A blower door must show a new home at 3.0 air changes per hour at 50 pascals on the prescriptive path, with 5.0 the worst any path allows. A draft of the next code, based on the 2024 IECC, has been adopted, though its effective date has been delayed.
For an attic that already exists, the working targets come from the rebate forms: R-38 on NPU’s, R-49 or more on Energize CT’s.
Common questions about insulation in Norwich
Do you install insulation in Norwich, CT?
Yes, where the owner of the building makes the call. That covers the pre-1940 two- and three-family houses, with 2,468 units in two-unit buildings and 2,322 in buildings of three or four, single-family houses of every era, and townhouses. In a larger building the roof and the outside walls belong to the owner or the association, and in a rental they belong to the landlord, not the tenant.
How much does insulation cost in Norwich?
Most projects run $3,500 to $12,500. A pre-1940 two- or three-family is priced as one building, on the stories of empty wall to dense-pack, the roof cavity over the top apartment and any old wiring to retire first. A cape is priced on its knee walls, eaves and slopes, a ranch on its attic area and bypasses. We walk the building for free and put the scope and price in writing.
Are there insulation rebates in Norwich?
Yes, and the utility decides which. Norwich Public Utilities customers use NPU’s free Home Energy Savings visit and its rebate of up to $1.75 per square foot for attics and $1.25 for walls. A home whose electric bill comes from Eversource is in Energize Connecticut: a $40 Home Energy Solutions visit and up to $2.00 per square foot or 75% of cost, which can rise to $2.50 and $15,000 because all of Norwich is an environmental justice community. No federal tax credit applies in 2026.
We rent a drafty apartment in Norwich. Can you insulate it?
That is the owner’s call to make. The walls, roof and cellar belong to your landlord, and in a two- or three-family the air leaking into your apartment usually travels through wall bays and a stair hall shared with the other units, so the fix is a whole-building job. If the landlord calls us, we will scope the building from cellar to roof and price it once.
Free estimate in Norwich
In a Norwich two- or three-family our free estimate starts in the cellar at the sill, the rim and the heating plant, climbs the stair hall, checks a wall bay behind an outlet cover or under a lifted course of siding for fill and old wiring, and ends in the roof cavity over the top apartment. Then a written scope and price. It is not NPU’s Home Energy Savings visit or Energize CT’s Home Energy Solutions visit, and it does not qualify a house for either rebate.
Phone 914-825-6824 any day from 8am to 8pm, or send the contact form. We work out of New Rochelle, NY, and every job is done by our own 100-plus in-house crew, never subcontractors.
Learn more
- Insulation contractors across New London County
- Insulation contractors in Montville
- Insulation contractors in Ledyard
- Insulation contractors in Griswold
- Insulating older homes
- Wall insulation
- Air sealing