The Home Insulators

Insulation Contractors in Greenburgh, NY

Greenburgh is a town of 38,167 housing units that contains
six incorporated villages and four unincorporated hamlets, and almost everyone
who lives in it answers with a village or hamlet name when asked where they
live. Worth stating plainly, because it decides which set of numbers your house
actually belongs to.

The houses we insulate in Greenburgh

The six villages are Ardsley, Dobbs Ferry, Elmsford, Hastings,
Irvington and
Tarrytown, each with
its own government and its own housing stock. The unincorporated hamlets are
Hartsdale, Edgemont,
Greenville and Fairview. Town-wide the numbers read: median year built
1959, 74.0% owner-occupied, 46.7% detached
(54.6% with attached houses), 23.7% built in the 1950s —
the largest single decade — 22.4% before 1940, 15.6% in the 1960s, 12.9% in
buildings of 50 units or more and 8.1% in three- and four-unit buildings. Read
that as a blend of ten places, not a description of one.

The bulk of our single-family work here is in the unincorporated belt, and
the Edgemont and Greenville side of it is the heart of the town’s post-war
stock: capes, expanded ranches, split levels and raised ranches from the 1950s
and 1960s, with a pre-war layer nearer the rail line and later infill on top.

The capes and story-and-a-half houses are the defining defect in this town,
and they are why plenty of people here have paid for insulation twice. A cape has
a short knee wall where the sloped ceiling meets the upstairs floor, and behind
that knee wall is an open triangular void running the length of the house. The
floor joist cavities pass straight under the knee wall and out to the eave with
nothing blocking them, so outdoor air enters at the soffit and travels beneath
the bedroom floor. The sloped ceiling bays above usually have no baffles and no
air barrier at all. The fix is knee-wall air sealing plus dense-packing
the slopes, not another six inches on the attic floor — the attic
floor is not the surface losing the heat.

The ranches and splits are more conventional: roughly R-19 attics and
R-11 to R-13 walls, settled loose fill, an attached garage with an
unsealed common wall and open bays above it, and on a split level a mid-level
floor cantilevered over that garage. The bypass list barely changes house to
house — dropped soffits over kitchen cabinets and hallways, plumbing
stacks, an uninsulated hatch in a bedroom closet, a whole-house-fan louver left
in place. The 1980s and later infill is a different job again: attic depth is
usually fine, the envelope is leaky, and the ducts sit in a vented attic.

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 — the air still moves, it just moves through
something softer.

In a Greenburgh cape that means blocking the floor cavities at the eave and
putting a real air barrier on the back of the knee wall before any material goes
in, because a batt stapled between knee-wall studs with open attic on the far
side is doing almost nothing. In a ranch or split it means the garage common
wall, the bays above it, the soffits, the stacks and the hatch, plus baffles at
every rafter bay. Then we insulate.

If a quote gives you a depth and never mentions air sealing, it is half a
job.

What insulation costs in Greenburgh

Most of our projects run between $3,500 and $12,500. A
Greenburgh ranch with a clear walk-up or pull-down attic, a garage ceiling and a
hatch sits in the lower half of that. A cape sits higher than its square footage
suggests, because knee-wall work is done on hands and knees in a triangular
space, the floor cavities are blocked one bay at a time, and the sloped ceilings
are dense-packed rather than blown. That is labor, not material.

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.

Insulation rebates in Greenburgh

One thing does not change anywhere in this town: village, hamlet or
unincorporated, Greenburgh is Con Edison for both gas and
electricity. That helps less than it sounds. Con Edison’s residential
Weather Ready program is not accepting
applications, and Con Edison’s own page tells Westchester customers to
expect news about 2027 incentives and to use NYSERDA in the meantime. The $4,000
figure still on one of its index pages is stale.

The live program is NYSERDA Comfort Home:
$2,500 to air seal and insulate the attic and rim joist,
$3,000 if wall and floor insulation is added, and
$2,000 more toward ENERGY STAR windows afterwards. The
contractor has to be on NYSERDA’s Comfort Home list and the house has to meet the
conditions of the whole package, not half of one. Households at or below 80% of
area median income should look at EmPower+: no cost up to
$14,000 downstate, or half the cost up to $7,000
at moderate incomes. See the full New York
rebate guide for the mechanics.

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.

Code and climate in Greenburgh

Add the pre-1940 stock to the 1950s wave and 46% of Greenburgh was standing
before 1960, before New York had an energy code at all. The current one is the
2025 Energy Conservation Construction Code of New York State, in
force since 31 December 2025 and based on the 2024 IECC.
Westchester is climate zone 4A.

For new construction and additions it sets R-49 in the
ceiling, R-30 in wood-framed walls (or R-20 cavity plus R-5
continuous), R-30 in floors, and R-15 continuous or R-19 cavity in basement and
crawl space walls. Anyone quoting R-60 is quoting Connecticut’s code.
None of it applies to a house already standing. The code does not
require an existing building to be altered, only that an alteration not leave you
with less R-value than you had. The Department of Energy separately recommends
R-60 for a retrofit attic here, which is guidance, not law.

Common questions about insulation in Greenburgh

Do you install insulation in Greenburgh, NY?

Yes, across the whole town: the unincorporated hamlets of Hartsdale,
Edgemont, Greenville and Fairview, and the six villages inside it. Most of our
work here is post-war capes, ranches and split levels, which is what the town’s
biggest decade produced.

How much does insulation cost in Greenburgh?

Most projects run $3,500 to $12,500. A ranch with an accessible attic and a
garage ceiling sits in the lower half. A cape costs more than its size suggests,
because the knee-wall voids, the blocked floor cavities and the dense-packed
sloped ceilings are all hand work in tight spaces.

Are there insulation rebates in Greenburgh?

Yes, through NYSERDA. The entire town is Con Edison for gas and electric, and
Con Edison’s weatherization program is not accepting applications, so Comfort
Home is the live one: $2,500 for air sealing plus attic and rim joist, $3,000
with walls and floors. EmPower+ covers income-qualified households. No federal
credit applies to a 2026 job.

Our Greenburgh cape is still cold upstairs after we added attic insulation. Why?

Because the attic floor was probably never the problem. In a cape the upstairs
rooms are bounded by knee walls and sloped ceilings, not by the attic floor, and
outdoor air runs in at the soffit, through the open floor cavities and out under
your bedroom. Blowing more material on the flat does not touch that. Blocking the
cavities and sealing the knee walls does.

Free energy audit in Greenburgh

We open the knee-wall doors, walk the attic, check the garage ceiling and the
rim joist, and give you a written scope and a price. No charge, no obligation. If
your attic depth is already adequate and the real problem is a knee wall and an
unblocked eave, that is what the report will say.

Call 914-825-6824 or use the form on this page. Open
8am–8pm, seven days. We have insulated hundreds of homes across New York,
Connecticut and New Jersey with a 100-plus in-house crew, and we hold
manufacturer installer certifications from the spray foam manufacturers we
use.

Learn more