28.4% of New Haven’s occupied housing units are owner-occupied. Of 59,626 units, 14.5% sit in buildings of fifty or more, apartments and condominiums have filled in around the Green since about 2000, and 360 State Street alone holds 500 units in 32 stories. The city founded in 1638 around the Nine Square Plan has little room for the detached house: 19.8% of units.
So in most of New Haven the people in a unit do not own the roof or the walls around them. A downtown apartment building or a Yale-area rental belongs to a landlord, a condominium board or an institution, and Energize Connecticut sends buildings of five or more units to its multifamily program. The work is the owner-occupied house: the 17.4% of units in two-unit buildings and 23.5% in three- and four-unit buildings where an owner lives on one floor, and the single-family houses of the residential neighborhoods.
The stock is old. 40.8% predates 1940 and the median unit dates from 1952. Gas heats 60.7% of occupied units, electricity 25.9% and fuel oil only 9.2%, so for most owners the case for sealing and insulating is written on the Southern Connecticut Gas bill.
The houses we insulate in New Haven
By era, 40.8% of New Haven predates 1940, 18.2% is from the 1940s and 50s, 20.4% from the 1960s and 70s, 11.4% from the 1980s and 90s and 9.2% has been built since 2000. After the Civil War the population doubled by the start of the 20th century, largely with immigrants from southern Europe, especially Italy, and the city reached its peak population after the Second World War. A large share of the city’s land area lies in National Register historic districts.
The neighborhoods ring Downtown: Dixwell and Dwight, The Hill and waterfront City Point, Beaver Hills, Edgewood and Westville to the west, East Rock and Newhallville to the north, Wooster Square, Fair Haven between the Mill and Quinnipiac rivers, and The Annex and East Shore, or Morris Cove, facing the harbor.
The pre-1940 two- and three-family is the core of the owner-occupied work. It is usually wood frame with a full-height stair hall, a cellar under the first floor, and either a low-slope roof with a shallow cavity or a steep roof with a finished third floor tucked into it. In either case the walls are balloon-framed, open from sill to roof, and empty. Old knob-and-tube wiring is presumed to be in those bays until proven otherwise, and an electrician retires any live runs before dense-packing starts. A top floor under the roof slope has knee walls and a short attic above the collar ties, and it is the coldest and hottest apartment in the house.
The single-family houses range from 19th-century frame houses to Colonial Revival homes, the style Alice Washburn set a standard for across the region, to post-war capes and ranches. A Colonial Revival house loses heat at the attic floor, the top of every balloon-framed wall and a sun porch over an open crawl space. A cape fails at the knee wall and the eave. The 1960s and 70s houses have settled loose-fill and leaky top plates.
The shore neighborhoods add weather. The 1938 hurricane, Hurricane Carol in 1954 and Hurricane Gloria in 1985 all struck New Haven, and a house facing the harbor in Morris Cove or City Point takes the wind directly. There the air sealing matters more than the depth of insulation, and a cellar or crawl space that has taken water gets closed cell foam at the rim and nothing fibrous on its walls.
Apartments, campus and the house you own
New Haven’s rental stock runs from downtown towers to converted houses around Yale. A downtown tower has no attic or wall cavity reachable from one unit, and its envelope is the owner’s or the board’s decision. A student apartment in a converted house belongs to a landlord, and the landlord is the one who decides; Energize Connecticut requires that landlord’s approval.
The city’s 15,157 owner-occupied units are different. If you own a two- or three-family and live in it, the whole building is yours to fix, top-floor roof to cellar, including the stair hall that ties the apartments together. That is the job we price, and Home Energy Solutions, the Energize CT insulation rebate and the Smart-E Loan are all written for homes of one to four units.
We seal before we insulate
Insulation slows conduction. It does nothing about air, and in a balloon-framed house air is the bigger loss: the open stud bays run like flues from the cellar to the roof, and warm air rises through them all winter.
In a New Haven two- or three-family the order is: seal the stud bays at the cellar sill and the top plates; seal the stair hall where it meets the roof; seal around the chimney, the plumbing stack and any old gravity vent; block the joist bays behind the top-floor knee walls at the eave; then dense-pack the walls, insulate the roof cavity or the slopes and the short attic, and finish with the cellar rim.
If a quote specifies a depth of insulation and never mentions air sealing, it is half a job.
What insulation costs in New Haven
Most of our projects run between $3,500 and $12,500. We price a two- or three-family as a single building. The total depends on how many stories of balloon-framed wall need dense-packing, whether that happens from inside to spare historic clapboards, how much knee wall and slope the top floor has, and whether old wiring has to be retired first. A single-family cape or Colonial Revival house is usually a smaller scope. See what spray foam costs for foam pricing.
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 New Haven
New Haven is United Illuminating (UI) for electricity and Southern Connecticut Gas (SCG) for gas, both part of 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. Its sweet spot is the one- to four-unit home, a home served by the program within the past six years is not eligible again yet, and a tenant must get the landlord’s approval.
Since 1 April 2026 a standard Home Energy Solutions assessment has cost a $40 copay. The authorized contractor tests for health and safety hazards, runs a blower door to find where air gets in, tests the ducts in a house with forced hot air or central air, and does up to seven hours of air sealing free before a $10 hourly charge starts. In a New Haven two- to four-family the program always splits the work into two visits: assessment first, air sealing and approved upgrades second. High demand can mean a wait, and every visit depends on the program’s funding.
The 2026 Energize CT insulation rebate is worth $2.00 per square foot or 75% of the total cost, whichever comes out lower, with one overall maximum of $10,000. Single and multifamily homes with up to four units qualify, and the eligible areas are the attic floor, a floored-over attic, walls, the rim joist, and the ceiling of a basement or garage. Every address in New Haven 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. Nothing is paid unless the insulation was recommended at the assessment, the project was approved before work began, and the installer belongs to the Energize CT Insulation Installers Network. Spray foam under a roof deck is not among the listed areas; ask the program before you count on a rebate for it.
The tier follows household income. On Energize CT’s 2026–2027 figures for a household of three, $78,692 or less is Income Eligible, at or below 60% of state median income, with up to 100% of insulation costs covered; $78,693 to $104,924 is Enhanced Incentives, below 80% of area median income, with a no-cost visit and insulation at up to $2.50 per square foot, the exact range set by zip code; $104,925 and above is the standard tier. If your income sits near a boundary, confirm the tier before paying a copay; the middle tier’s visit is free and its insulation incentive is higher.
An owner who lives in the building can borrow through the Connecticut Green Bank’s Smart-E Loan, which covers one- to four-unit homes, needs no money down and goes up to $50,000. The APR is 6.99% whether the term is 5, 7 or 10 years, 7.49% at 12 years and 7.99% at 15 years with lenders that offer that term. Smart-E is handled through the Green Bank’s participating contractors, so ask whether your contractor participates.
Program contractors handle the assessment, and the rebate follows only network installers, so before signing, ask any installer, including us, whether they belong to that network. Federally, nothing is left for a 2026 job: the Section 25C credit does not apply to anything placed in service after 31 December 2025, meaning there is no federal tax credit for insulation installed in 2026, and Connecticut has not made the IRA home energy rebates available. More in our guide to Connecticut insulation rebates.
Code and climate in New Haven
79.4% of New Haven’s housing was built before 1980. The city, like all of Connecticut, is in climate zone 5A.
The 2022 Connecticut State Building Code, built on the 2021 IECC with the state’s own amendments, has applied since 1 October 2022. A new New Haven home needs an R-60 ceiling, R-49 being enough where the insulation keeps its full depth over the top plate at the eaves; framed walls of R-13 plus R-10 continuous, R-20 plus R-5 continuous or R-30 in the cavity; R-30 in floors; R-13 plus R-5 continuous or R-15 continuous on basement walls; U-0.30 glass; and a blower-door result no leakier than 3.0 air changes per hour at 50 pascals on the prescriptive path. 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 New Haven
Do you install insulation in New Haven, CT?
Yes, in owner-occupied houses: the two- and three-family houses where the owner lives on one floor, 17.4% of units in two-unit buildings and 23.5% in three- and four-unit buildings, and the single-family houses from Westville and Beaver Hills to East Rock and Morris Cove. In an apartment building or a downtown tower the roof and the outside walls belong to the owner or the association, and in a rental the owner, not a tenant, is the one who decides.
How much does insulation cost in New Haven?
Most projects run $3,500 to $12,500. A two- or three-family is priced as one building, and the drivers are the floors of balloon-framed wall to dense-pack, whether they are filled from inside to leave historic siding alone, the knee walls and slopes of the top floor, and whether old wiring must be retired first. A single-family house usually costs less to do. The walk-through is free, and the scope and price are written down.
Are there insulation rebates in New Haven?
Yes. New Haven is UI for electric and Southern Connecticut Gas for gas, and Energize Connecticut’s Home Energy Solutions visit carries a $40 copay, or no cost for income-qualified households. Every New Haven address is in an environmental justice community, which can raise the insulation incentive to $2.50 per square foot, up to $15,000, on work recommended at that visit, approved first and done by an Energize CT Insulation Installers Network contractor. There is no federal tax credit for insulation installed in 2026.
I rent an apartment in New Haven and it is freezing. Can I get it insulated?
The walls, the roof and the cellar belong to whoever owns the building, so the owner, not a tenant, is the one who decides, and Energize Connecticut’s Home Energy Solutions program requires the landlord’s approval for a renter to take part. Tell your landlord about the program: it is written for buildings of one to four units, and every New Haven address is in an environmental justice community, which can raise the insulation incentive.
Free estimate in New Haven
In a two- or three-family we go from the cellar sill up the stair hall to the knee-wall spaces and attic of the top floor, checking which walls are empty and what wiring runs through them. In a single-family house it is the attic floor, the porches and the rim. You get a written scope and a price. The walk-through is our own free estimate, which is a different thing from the program’s Home Energy Solutions assessment and earns no rebate by itself.
The number is 914-825-6824, answered 8am–8pm seven days, and the contact form works too. We are family-owned, based in New Rochelle, NY, and our 100-plus person crew is in-house, with no subcontractors.
Learn more
- Insulation contractors across New Haven County
- Insulation contractors in West Haven
- Insulation contractors in East Haven
- Insulation contractors in North Haven
- Insulating older homes
- Air sealing
- Basement ceiling insulation