We insulate houses across all 23 towns in Fairfield County, from Greenwich to
Sherman. This page covers what is true county-wide — the climate zone, the
code, and how the Connecticut rebate actually works. The town pages below cover
what is true only there: what the houses are, and how they fail.
Fairfield County is a colder zone than most people expect
Fairfield County is climate zone 5A. That puts it a full
zone colder than Westchester County, twenty minutes over the state line, and it
is why the same house needs more attic insulation on this side of the border
than on that one.
You will see Fairfield County listed as zone 4A in some places, including on
some contractor sites. That comes from a 2021 ASHRAE addendum that Connecticut
has not adopted. Under the code actually in force here, it is 5A.
The code in force is the 2022 Connecticut State Building Code,
based on the 2021 IECC, effective 1 October 2022. The next edition was expected
in July 2026 and has been delayed pending legislative review, so the 2022 code
still applies. For new construction and additions it sets:
- Ceiling: R-60
- Wood-framed wall: R-30, or R-20 cavity plus R-5 continuous,
or R-13 plus R-10 continuous, or R-20 continuous - Floor: R-30
- Basement and crawl space wall: R-19 cavity, R-15 continuous, or
R-13 plus R-5 continuous
None of that applies to a house that is already standing.
The code expressly does not require an existing building to be altered. It only
requires that if you alter an assembly, you do not end up with less insulation
than you started with. Treat R-60 as a benchmark, not a violation notice —
though it happens to be the same number the Department of Energy recommends for
a retrofit attic in this zone, so it is a benchmark worth aiming at.
The rebate, in one paragraph
Connecticut runs insulation incentives through Energize
Connecticut, funded by the utilities. The programs are identical whether
Eversource or United Illuminating delivers your power. The rebate is
$2.00 per square foot or 75% of the job, whichever is less, capped at
$10,000, and $2.50 per square foot up to $15,000 for
income-qualified households and homes in designated environmental justice
communities. Households under 60% of state median income can have approved
insulation covered at up to 100%.
The order is not negotiable: a Home Energy Solutions
assessment first ($40 copay as of April 2026), insulation
recommended during that visit, the project
approved before anyone installs anything, and the work done by
a contractor on the Energize CT Insulation Installers Network.
One limit that matters more here than anywhere: attic floors, floored-over attics, above- and below-grade walls, basement and garage ceilings and rim joists qualify.
Attic roof decks and rafters do not. Crawl spaces are not on that list either. A crawl space ceiling may or may not be accepted as a floor over unconditioned space depending on how the job is written up, so if the crawl is the work, confirm it with the program before installation rather than after. If someone has quoted you
spray foam at the roof deck and told you the rebate covers it, they are wrong,
and you would find out at the application. Full mechanics, income tiers and
sources are on the Connecticut rebate
guide.
The federal Section 25C tax credit ended for anything placed in service after
31 December 2025. There is no federal insulation credit on a
2026 job.
Which utility serves your town
Same programs either way — but you will want to recognise the name on
your own bill.
| United Illuminating | Eversource |
|---|---|
| Bridgeport, Easton, Fairfield, Shelton, Stratford, Trumbull | Bethel, Brookfield, Danbury, Darien, Greenwich, Monroe, New Canaan, New Fairfield, Newtown, Norwalk, Redding, Ridgefield, Sherman, Stamford, Weston, Westport, Wilton |
What we find, by kind of town
Fairfield County is not one housing market. Grouped by what the houses
actually are:
The pre-war urban cores. Bridgeport, Norwalk and Danbury
hold most of the county’s two- and three-family stock. A third of Bridgeport’s
housing sits in two- to four-family buildings, and four in five Bridgeport homes
predate 1980. The recurring job is balloon framing — open stud bays running
from the sill to the attic — plus unsealed common walls between units and
knob-and-tube wiring that has to be dealt with before anything gets blown in.
The post-war cape and ranch belt. Stratford, Fairfield and
Trumbull. Stratford has the highest pre-1980 share in the county at 84%, and a
third of the town went up in the 1940s and 50s. The knee walls behind the
second-floor bedrooms of an untouched cape are usually the single biggest heat
loss in the house, and adding depth to the flat attic does nothing for them.
The Gold Coast. Greenwich, Darien, New Canaan and Westport.
Old stock and an active teardown-and-rebuild market at the same time —
Westport has the county’s highest post-2000 share at 23%, in a town with no new
land. Masonry estate houses cannot be dense-packed and should not be sold as if
they can. New Canaan’s mid-century modernist houses are a really specialised
problem: flat roofs with no ventilated cavity, window walls, slabs with no
perimeter insulation.
The two-acre wooded towns. Wilton, Weston, Ridgefield,
Redding and Easton. These market themselves on colonial Main Streets, and the
housing does not match the branding: only 12% of Ridgefield and 11% of Wilton
predate 1940. The volume job is a 1960s or 70s colonial with R-11 walls, six
inches of settled fiberglass, and an attached garage nobody has ever sealed.
The late-developing outer ring. Shelton, Monroe, Newtown,
Brookfield and Bethel. The newest stock in the county, which produces the most
common objection we hear: my house is newer, it must be fine. A 1985 colonial
has code-minimum walls and an attic full of gapped batts, and its ductwork is
usually sitting in a vented attic.
The Candlewood Lake towns. New Fairfield, Sherman, and the
lake frontage of Brookfield and Danbury. The lake was created in 1928 and its
shore sold in small lots for summer cottages. Most of those are year-round
houses now, winterized in stages, with floors over vented crawl spaces or piers
and roofs framed too shallow to insulate conventionally.
Fairfield County towns we serve
Every town has its own page with that town’s housing stock, its utility, and
the questions people there actually ask.
Coastal and Gold Coast
The Housatonic and the post-war belt
The wooded inland towns
The northern towns and Candlewood Lake
We seal before we insulate
Insulation slows heat moving through a surface. It does nothing about air
moving through a gap. Pack a leaky attic with cellulose and you have a leaky
attic with cellulose in it.
So the first half of a real job is closing the holes: the chimney chase, the
open framing above a dropped soffit, the plumbing stack, the top plates, the
attic hatch, the recessed lights. That work is unglamorous, it photographs
badly, and it decides whether the insulation you paid for actually performs.
Then we insulate. If a quote specifies a depth of insulation and never mentions
air sealing, it is half a job.
What it costs
Most of our spray foam projects run between $3,500 and
$12,500. 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. After air sealing and insulating, homeowners typically
save 20% or more on heating and cooling.
Common questions about insulation in Fairfield County
Do you work across all of Fairfield County?
Yes, all 23 towns. We have insulated hundreds of homes across New York,
Connecticut and New Jersey with a 100-plus in-house crew. Travel time to the
northern towns is longer than to the coast, which we will tell you when we
schedule rather than after.
What is the difference between Fairfield County and Westchester for insulation?
Climate zone, code and rebate program, all three. Fairfield County is zone 5A
with an R-60 ceiling standard under Connecticut’s code. Westchester is zone 4A
with R-49 under New York’s. The rebate programs are entirely separate: Energize
Connecticut on this side, NYSERDA on that one. A contractor who quotes you the
same numbers in both places has not checked.
Does the Connecticut rebate cover spray foam?
It covers spray foam applied to the attic floor, to walls, and to the ceiling
of an unconditioned basement or crawl space. It does not cover attic roof decks
or rafters, which is where a lot of spray foam goes. That is a real limitation
and worth knowing before you plan the job rather than after. We will price both
approaches after incentives so you can compare them properly.
How long does a job take?
Most attic and crawl space jobs are one to two days on site. Whole-house work
on a large or complicated house can run longer. The Home Energy Solutions
assessment and the rebate pre-approval have to happen first, and that scheduling
is outside our control — Energize CT notes there can be a waiting list.
Start earlier than you think you need to if you want the work done before
winter.
Free energy audit anywhere in Fairfield County
We walk the attic, the basement and the crawl space, find where the house is
losing air and heat, and give you a written scope and a price. No charge, no
obligation. Call 914-825-6824 or use the form on this page.
Open 8am–8pm, seven days. We hold manufacturer installer certifications
from the spray foam manufacturers we use.