The Home Insulators

Insulation Contractors in Hillsdale, NJ

Hillsdale owns its houses. 90.3% of occupied units are owner-occupied, a higher share than any other Bergen County town we cover, and 91.8% heat with gas, also the highest. The person reading this is almost certainly the person who owns the attic, and the bill that goes down is a PSE&G gas bill.

The house is most likely a 1960s split-level or ranch, or a 1950s cape, on a street that was surveyed as a summer enclave in 1891 and built out after 1945. Six in ten Hillsdale homes date from 1940 to 1979, insulated to a standard that has since moved. This page is for that owner.

The houses we insulate in Hillsdale

The median Hillsdale home was built in 1959. Of 3,479 units, 24.9% predate 1940, 28.0% went up in the 1940s and 50s, and 32.2% in the 1960s and 70s, the biggest cohort. Only 4.7% has been built since 2000; 85.1% of the borough predates 1980. Detached houses are 84.4% of the stock, two- to four-family buildings 5.7%, and buildings of 20 or more units 1.7%.

Hillsdale Manor is the name people know, and it is younger than it sounds. The tract from Lincoln Avenue to Knickerbocker and Piermont Avenues, and from Broadway to St. Mary’s and Raymond Streets, was surveyed and subdivided in 1891 as a summer enclave with its own station, hotels and a newspaper. 250 lots sold at a 1910 auction, but most stayed undeveloped until the post-war boom filled the neighborhood with houses. The borough had 891 people in 1900 and 8,734 in 1960, so what stands on an 1891 lot today is usually a 1950s cape or a 1960s split.

Those 1960s splits and ranches, in the Manor and on the west side, are the most common job, and they are insulated, which is the trap. The owner sees loose-fill in the attic and assumes the envelope is handled. What we find is fill settled to a fraction of its depth, wind-washed eaves where the insulation stops short of the soffit, and a long, low attic of unsealed bypasses: top plates, the dropped soffit over the kitchen cabinets, a bath fan blowing into the attic, recessed lights. A split adds a cantilevered bay and a bedroom over the garage with open joist bays under the floor, which is why that bedroom is the cold one.

The 1940s–50s capes come next. A cape’s weak point is the knee wall, a short stud wall with insulation on the room side and no air barrier behind it, facing a triangular attic that is open to the eaves. The floor joists run under the knee wall out to the eave, so outdoor air travels under the bedroom floor. The slopes are 2×6 rafters with no baffle and the flat attic above is shallow. Many of these capes carry asbestos-cement shingle siding; we fill those walls from inside or by lifting shingles, never by drilling through the siding.

A quarter of the borough is older than 1940: the railroad-era houses around the Register-listed station, on a line whose Pascack Valley stops opened on 4 March 1870. They are balloon-framed, with stud bays open from sill to attic, plank sheathing, no wall insulation and a rubble or brick foundation with a leaky rim. We block the plates and dense-pack. In these houses we check for pre-1950 wiring and vermiculite in the attic flat before anything else, because either one stops the job until it is dealt with.

The stone houses and the brook

Hillsdale keeps three Register-listed Jersey Dutch sandstone houses, the John Banta, Garret Durie and Vanderbeek houses, and across the county unlisted ones survive as frame-wrapped or stuccoed farmhouses. Those walls are mortared rubble sandstone with no cavity to fill, and we will not drill them. The work in a stone house is the garret under the gambrel roof from inside, the attic floor, the rubble cellar and its wet rim, and the later frame wing, which behaves like any balloon-framed house.

Then there is Pascack Brook. The police run a two-stage flood siren for it, sounded at 3.5 and 4.5 feet, and the 2013 engineering study that named Beechwood Drive pointed to the Woodcliff Lake reservoir dam upstream as the lever. On the low streets we find garages and crawl spaces that flooded once and will again, batts fallen out of the joist bays, and lower-level walls stripped after a flood and never re-insulated. We do not put closed-cell foam on a basement wall that floods. We seal and insulate the first-floor deck over any crawl or garage you have written off, so the rooms above stay warm whatever the brook does.

We seal before we insulate

Insulation slows heat moving through a surface. It does nothing about air moving through a gap. Blow another foot of cellulose over a 1960s attic full of open bypasses and you have a deeper attic that leaks exactly as much as it did.

In a Hillsdale split or ranch the sequence is: seal the top plates, the dropped soffits, the plumbing and flue chases, the bath fan and the recessed lights; baffle the eaves; then add depth. In a cape, the knee wall gets an air barrier on its back side and the joist bays under it are blocked at the eave before anything is added. Then the rim joist in the basement. In that order the insulation performs at the depth on the quote.

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

What insulation costs in Hillsdale

Most of our projects run between $3,500 and $12,500. In Hillsdale the number moves with the attic: how much settled fill has to be topped up or removed, how many bypasses, cans and soffits need sealing, and whether a cape’s knee walls and slopes are in the scope. A bedroom over the garage or a crawl space that floods adds a floor assembly to the job.

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 Hillsdale

Hillsdale is PSE&G territory for both electric and gas: PSE&G electric, not Rockland Electric, which serves Montvale and runs a different rebate program. With 91.8% of the borough heating with gas, the savings land on the gas bill.

PSE&G Whole Home Energy Solutions offers up to $7,500 in rebates toward air sealing, insulation and related work, plus 0% on-bill repayment of up to $25,000 over 7 or 10 years. It starts with PSE&G’s home energy assessment, and the work must be done by a BPI-certified contractor participating in PSE&G’s program. PSE&G does not publish per-item amounts. The Whole Home Energy Assessment itself is free for any PSE&G gas or electric customer, once a year.

Two no-cost programs sit under that. PSE&G Home Weatherization provides insulation, air sealing and duct sealing at no cost for households above 250% and below 400% of the federal poverty level. New Jersey Comfort Partners does the same for households at or below 250% of the federal poverty guidelines, for example $82,500 for a family of four; homes heated with oil or propane are referred to the state weatherization office. The New Jersey IRA Home Energy Rebates have not launched — the state’s page says “under development” — so they are not available yet. See the full New Jersey 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 Hillsdale

85.1% of Hillsdale’s housing went up before 1980, and New Jersey’s first statewide energy subcode took effect on 1 January 1977, so nearly the whole borough was built before there was one. Bergen County is climate zone 5A; Essex, Hudson and Union next door are 4A.

New Jersey adopted the 2024 IECC on 17 August 2026. For new construction it sets R-49 ceilings — the 2021 edition it replaced called for R-60, and a permit application filed under the old code is still accepted for six months, until about mid-February 2027 — with walls at R-20 plus R-5 continuous, windows at U-0.28, and air leakage of 3.0 air changes per hour at 50 pascals. R-49 is the number the state considers right for this climate, and it is what we design to.

A house already standing falls under New Jersey’s Rehabilitation Subcode: insulating the attic does not require bringing the rest of the house to code or a blower-door test. Blown-in or batt insulation against the interior finish is ordinary maintenance with no permit; spray foam and other foam plastic insulation need a permit, which we pull as part of the job.

Common questions about insulation in Hillsdale

Do you install insulation in Hillsdale, NJ?

Yes. Most of what we do in Hillsdale is the detached house, which is 84.4% of the borough: 1960s splits and ranches with settled attic fill and open bypasses, 1940s–50s capes with unsealed knee walls, and the balloon-framed houses around the station that need their stud bays blocked and dense-packed. We also work the stone houses from inside and the crawl spaces and garages along Pascack Brook.

How much does insulation cost in Hillsdale?

Most projects run $3,500 to $12,500. For a split or ranch the drivers are in the attic: the depth of settled fill to top up or remove, the count of bypasses, cans and soffits to seal, and whether a bedroom over the garage needs its floor done. A cape adds knee walls and slopes. A crawl space or garage that floods is priced as a floor-deck job, not a wall job.

Are there insulation rebates in Hillsdale?

Yes. Hillsdale is PSE&G territory for gas and electric, not Rockland Electric. PSE&G Whole Home Energy Solutions offers up to $7,500 in rebates plus 0% on-bill repayment of up to $25,000, starting with a free home energy assessment. Households at or below 250% of the federal poverty guidelines can get the work at no cost through New Jersey Comfort Partners. There is no federal 25C credit on a 2026 job.

Our Hillsdale garage and crawl space flooded when Pascack Brook came up. Can they still be insulated?

Yes, but not the way a dry basement would be. We will not put closed-cell foam on a basement wall that floods, and batts that fell out of the joist bays after the last event should not go back in. The right move on the low streets near the brook is to air seal and insulate the first-floor deck above the crawl or garage, so the living space stays warm whatever happens below it.

Free energy audit in Hillsdale

We walk the attic first — depth of fill, the eaves, where the bath fan goes — then the knee walls if it is a cape, the basement or crawl, the rim joist and the floor over any garage. In a stone house we look at the garret and frame wing and tell you we will not touch the stone. Then 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 work out of New Rochelle, NY with a 100-plus in-house crew, and we hold manufacturer installer certifications from the spray foam manufacturers we use.

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