The Home Insulators

Insulation Contractors in Nanuet, NY

Fewer than half of Nanuet’s 7,566 housing units are detached houses: 46.2%. The rest is 13.5% attached townhouses, 15.0% in two- to four-family houses, 14.2% in buildings of five to nineteen units, 9.6% in buildings of 20 or more, and 116 mobile homes.

Nanuet built itself in two waves. 34.5% of the stock went up in the 1960s and 70s, after the Thruway, the Tappan Zee Bridge and the Palisades Parkway opened the hamlet to commuters, and another 29.5% in the 1980s and 90s, much of it townhouses and garden condominiums. Those are two different jobs, and this page covers both.

It is written for the owner of a split-level with a settled attic, and for the owner of a 1980s townhouse who has just learned that the association owns the roof.

The houses we insulate in Nanuet

The median Nanuet home was built in 1974. 10.1% of the stock predates 1940, 15.8% is 1940s–50s, 34.5% is 1960s–70s, 29.5% is 1980s–90s and 10.0% has gone up since 2000; 60.5% predates 1980. 64.3% of units are owner-occupied, so about a third of the hamlet rents. Gas heats 80.9% of homes and electricity 14.4%.

Nanuet is a hamlet of Clarkstown, named in 1856 for the Munsee chief Nannawitt; the railroad reached it in 1869 on what is now the Pascack Valley Line. The Nanuet Mall opened on 4 November 1969, as the 1960s houses were still going up, was demolished from January 2012, and came back as the open-air Shops at Nanuet in 2013, renamed Nanuet Town Centre in May 2025 with housing planned on the former Sears site and no start date announced. The numbers here are for the Census-designated place, which is smaller than the mailing address; the Nanuet address reaches into Bardonia, West Nyack and Pearl River. Bardonia, across the line, is 60.5% 1960s–70s and 26.9% 1980s–90s, the same two waves.

The 1960s–70s houses are ranches, splits and bi-levels. Some insulation went in when they were built, and the standard has moved since; the attic is where they leak. The loose-fill has settled and blown back from the eaves, and the bypasses were never sealed: the chimney chase, the plumbing stacks, bath fans dumping into the attic, a dropped soffit over the kitchen cabinets that opens straight into the attic, and the hatch. Splits add a cantilevered floor over the entry and a bedroom over the garage, both with open joist bays. The job is to seal every one of those, then bring the attic to full depth.

The 1940s–50s capes, 15.8% of Nanuet, are the knee-wall houses: finished rooms upstairs with a triangular attic behind them, nothing on the back of the knee wall, joist bays open to the eave, and 2×6 slopes with no baffles. The pre-1940 tenth around the old station is balloon-framed and gets checked for knob-and-tube before anything goes into a wall. The 15.0% in two- to four-family houses and the 9.6% in buildings of 20 or more are landlord and board work, scoped as a building rather than unit by unit.

And there are 116 mobile homes, nearly all of Clarkstown’s 117. A mobile home is a different product: a belly board and 2×6 floor with batts sagged or torn, skirting that is missing or unvented, a metal or low-slope roof with 2 to 4 inches of batt, ducts in the belly and a furnace closet short of combustion air. Dense-packing the walls is rarely the answer; belly repair, skirting, duct sealing and roof-cavity work are.

If your Nanuet home is a 1980s townhouse or garden condo, the association owns the attic

29.5% of Nanuet went up in the 1980s and 90s, and the 13.5% attached and 14.2% five-to-nineteen-unit shares are that decade’s product: townhouse rows and garden condominiums with a homeowners’ association that owns the roof and the attic plane. They were built with R-11 or R-13 walls and a code-minimum attic, so the walls are not the job. The attic is.

The party walls between units run up into a shared attic, and the cavity is usually open at the plate, so warm air from one unit ends up over the next. The common attic’s ventilation is unbalanced, end units take the exposure, and there is often an air handler up there with leaky ducts. Where a unit has a garage under a bedroom, the joist bays over the garage run open into the floor. The recessed lights and bath fans were not built for contact with insulation.

The honest scope is two scopes: one for the board, covering the common attic plane, the party-wall tops, the ducts and the ventilation, and one for the unit owner, covering the rim, the garage ceiling, the cans and the fans inside their own walls. We write either, and we will tell you when the part you control is the smaller part.

We seal before we insulate

Insulation slows heat moving through a surface. It does nothing about air moving through a gap. Blow another eight inches over a Nanuet split’s attic without sealing it and the chimney chase still pulls heated air out of the house all winter, under more cellulose.

The sequence for a Nanuet split or ranch: seal the chimney chase with sheet metal and high-temperature sealant, foam the plumbing stacks and wire penetrations at the ceiling plane, cap the dropped soffit with a rigid air barrier, vent the bath fans outside and seal their housings, seal or replace the recessed cans, weatherstrip and insulate the hatch, block the cantilever and garage-ceiling joist bays, then bring the attic to full depth with baffles at the eaves. In a townhouse, the party-wall top plate heads that list.

If a quote specifies a depth of insulation and never mentions air sealing, it is half a job.

What insulation costs in Nanuet

Most of our projects run between $3,500 and $12,500. In Nanuet what moves the number is the count of attic bypasses to seal before the fill goes in, whether a cantilever or a bedroom over the garage has to be opened up, and, in a townhouse, how much of the work sits in a common attic that the association commissions. Spray foam pricing for the hamlet is on our Nanuet spray foam cost page.

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 Nanuet

Nanuet is Orange & Rockland territory for both electric and gas, as all of Rockland County is, and 80.9% of the hamlet heats with gas. O&R has no insulation or air-sealing rebate of its own; its weatherization page sends homeowners to NYSERDA.

The live money is NYSERDA Comfort Home: $2,500 to air seal and insulate the attic and rim joist, $3,000 if wall and floor insulation goes in too, and $2,000 more toward ENERGY STAR windows afterwards. O&R customers are eligible. The incentive is paid to the contractor and passed to you as a credit on the contract, and the contractor must be on NYSERDA’s Comfort Home participating list.

For the third of Nanuet that rents, and for owners on a tight budget, EmPower+ is the bigger program. Rockland counts as downstate: income-eligible households (at or below 80% of area median income, or on HEAP, SNAP or SSI) get the work at no cost up to $14,000, and moderate-income households pay half the cost up to $7,000. It is how New York delivers federal HEAR money, which adds up to $1,600 for air sealing, insulation and ventilation. Any owner of a one- to four-family home can also get NYSERDA’s no-cost Home Energy Plan assessment. See the full New York 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.

Code and climate in Nanuet

Six in ten Nanuet units, 60.5%, went up before 1980, and New York had no statewide residential energy code until the late 1970s. Rockland County is climate zone 5 — not Westchester’s zone 4 — under the 2025 Energy Conservation Construction Code of New York State, in force since 31 December 2025 and based on the 2024 IECC.

For new construction and additions it sets R-49 ceilings, R-30 wood-framed walls (R-20 cavity plus R-5 continuous is the usual alternative), R-30 floors, R-15 continuous or R-19 cavity in basement walls, windows at U-0.27 and air leakage of 3.0 air changes per hour at 50 pascals. Those are the same numbers New York wrote for zone 4, so a Nanuet attic and a Westchester attic are designed to the same depth. None of it forces a change on a house already standing. The code applies only to the portion being altered, and adding attic insulation does not trigger a blower-door test or a whole-house upgrade. Permit rules for insulation-only work are set by each town. R-49 is the number the state considers right for this climate, and it is what we design to.

Common questions about insulation in Nanuet

Do you install insulation in Nanuet, NY?

Yes. Most of what we do here is the 1960s and 70s ranches and splits, 34.5% of the hamlet, where the job is sealing the attic bypasses and bringing settled loose-fill to full depth, and the 1980s and 90s townhouses and garden condos, 29.5%, where we write one scope for the association’s common attic and one for the unit. We also work in the capes, the two-families and the mobile homes.

How much does insulation cost in Nanuet?

Most projects run $3,500 to $12,500. For a split or ranch the drivers are the number of bypasses to seal at the attic floor, whether a cantilever or a garage ceiling has to be opened, and the attic’s area. In a townhouse the unit owner’s share is usually the smaller number, because the common attic plane belongs to the association and is priced to the board.

Are there insulation rebates in Nanuet?

Nanuet is Orange & Rockland territory for gas and electric, and O&R has no insulation rebate of its own; it sends customers to NYSERDA. Comfort Home pays $2,500 for air sealing plus attic and rim joist, $3,000 with walls and floors, through a contractor on its participating list. EmPower+ does the work at no cost up to $14,000 downstate for households at or below 80% of area median income.

I own a 1980s townhouse in Nanuet. Can you insulate just my unit?

Partly. The rim, the garage ceiling, the recessed lights and the bath fans inside your unit are yours to fix, and sealing them helps. The attic plane and the party-wall tops above you belong to the association, and warm air moves between units through them, so the bigger gain needs a board scope. We write both, and the board scope usually goes on the association’s next capital agenda rather than on your invoice.

Free energy audit in Nanuet

We walk the attic first, because in a Nanuet split that is where the loss is: the chase, the stacks, the soffit, the fans, and the depth and condition of what is already there. Then the cantilever, the garage ceiling and the rim. In a townhouse we look at the party wall from the attic side and tell you what is yours and what is the association’s. You get a written scope and a price, with no charge and no obligation.

Call 914-825-6824 or use the form on this page. Open 8am–8pm, seven days. We work out of New Rochelle, NY with a 100-plus in-house crew.

Learn more