The Home Insulators

Insulation Contractors in Leonia, NJ

39.9% of Leonia’s housing predates 1940 and the median home was built in 1946. Only 24% of the borough was built after 1969, and only 3.5% since 2000, because Leonia kept single-family zoning and never rebuilt itself. The house you own is very likely the house that stood on the lot in 1930, with the walls it was born with and, often enough, the wiring.

This page is for the owner of a Leonia Heights colonial, foursquare or Craftsman house first, and then for the cape on the streets that filled in after the bridge opened in 1931.

The houses we insulate in Leonia

Leonia has 3,565 housing units, 69.9% of them owner-occupied; 61.0% are detached houses, 7.7% attached, 13.4% in two- to four-family buildings, 10.3% in buildings of five to nineteen and 7.3% in buildings of twenty or more. 39.9% predates 1940, 29.3% is 1940s and 50s, 14.5% is 1960s and 70s, 12.7% is 1980s and 90s, 3.5% is since 2000; 83.7% predates 1980. Gas heats 83.2% of homes, electricity 11.0%, oil 2.9%. In a borough this size the decade shares are shape rather than precision; the median year, tenure and detached share are the stable numbers.

Leonia Heights is the pre-war quarter. The Leonia Heights Land Company sold lots from 1899 and sold the town on the New York subways as “the Athens of New Jersey”; more than eighty artists settled from the 1890s on, and Harvey Dunn’s Leonia School of Illustration opened in 1915. The houses those buyers put up between 1899 and 1930 are colonials, foursquares and Craftsman houses, and nearly all of them are balloon-framed: stud bays open from the sill plate to the attic, plank sheathing under the siding, no insulation in the walls, a rubble or brick foundation with a rim that leaks all winter. Every exterior wall works as a flue the height of the house. In these houses knob-and-tube is the default assumption, and it has to come out before anything goes into a wall or gets buried in an attic floor; and we check the attic flat for vermiculite, which has to be tested before anyone disturbs it.

The stucco and Tudor share of the Heights is the exception: stucco on lath and half-timbering with no fillable cavity, and we do not drill to confirm it. The attic plane, the knee walls behind the third-floor rooms, the chimney chase and the rim carry those jobs, from inside.

Two Leonia houses are stone, the Cole-Allaire House of about 1765 and the 1786 sandstone Vreeland House, both on the National Register. Those are mortared rubble with plaster on the stone; there is nothing to fill and no drilling the exterior of a landmark. The garret from inside, the attic floor, the cellar and rim, and any frame wing are the scope.

The low ground is Overpeck. The 1859 railroad station sat on Fort Lee Road near the creek and the Grand Avenue marsh forced the school to move in 1905; the land has not changed its mind. Ida dropped 3.42 inches of rain on Leonia in one hour on 1 September 2021, a 200- to 500-year storm, and the borough now runs 1,500-gallon-per-minute pumps at its low points. On the streets by the creek we treat a finished basement that flooded as a lower level that will flood again: no closed cell foam on that wall, and the first-floor deck above it sealed and insulated instead. The same lowland continues into Englewood.

The bridge-era third of Leonia

29.3% of Leonia went up in the 1940s and 50s, the growth the George Washington Bridge brought after 1931, and it is a different house from the Heights. These are capes and story-and-a-half houses, and they fail in a pattern: a knee wall with no air barrier on its back side, joist bays running open from the heated room out to the eave, an unbaffled rafter slope, and a shallow flat attic with a few inches of settled fill. Many still carry their original cement shingle siding, so the walls are filled from inside or by lifting shingles, never by drilling through. The 14.5% from the 1960s and 70s are ranches and splits with a long low attic of unsealed bypasses and a bedroom over the garage. All of it went up before New Jersey’s first energy subcode took effect on 1 January 1977, and so did 83.7% of the borough.

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.

In a balloon-framed Leonia Heights house the sequence is the job, and it doubles as fire blocking. Block the stud bays at the top and bottom plates so the walls stop working as flues. Then close the attic plane: the chimney chase, the stair opening, the plumbing stack, the top plates, the knee walls behind any third-floor room. Then dense-pack the walls, then the attic floor, then the rim in the cellar. In a bridge-era cape it starts at the knee wall: air barrier on its back side, blocking in the joist bays, baffles in the slopes, then the flat.

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

What insulation costs in Leonia

Most of our projects run between $3,500 and $12,500. In Leonia what moves the number is the count of wall bays to block and dense-pack, whether the attic is a flat floor or a set of knee walls and slopes, and how reachable the rim is in a rubble cellar. Knob-and-tube removal, where it is needed, is an electrician’s cost ahead of ours, and in a house from before 1930 it should be assumed until proven otherwise.

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 Leonia

Leonia is PSE&G territory for both electric and gas, and with 83.2% of homes heating with gas, the utility that bills you for heat is the one that runs the programs.

The live money is PSE&G Whole Home Energy Solutions: 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 what each measure pays, so “up to $7,500” is as precise as anyone can be.

PSE&G’s Whole Home Energy Assessment is free for any PSE&G gas or electric customer, once a year. PSE&G Home Weatherization installs 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 at no cost for households at or below 250% of the federal poverty guidelines, $82,500 for a family of four, and refers homes heated with oil or propane 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.

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. The full picture is in our New York and New Jersey rebate guide.

Code and climate in Leonia

83.7% of Leonia’s units went up before 1980, and New Jersey’s first statewide energy subcode took effect on 1 January 1977, so more than eight in ten predate any energy code. 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. Existing homes fall under New Jersey’s Rehabilitation Subcode: insulating an attic does not require bringing the rest of the house to code and does not require a blower-door test. Blown-in or batt insulation installed 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. R-49 is the number the state considers right for this climate, and it is what we design to.

Common questions about insulation in Leonia

Do you install insulation in Leonia, NJ?

Yes, and most of what we do here is pre-1940 houses in Leonia Heights, 39.9% of the borough: balloon-framed colonials, foursquares and Craftsman houses that get their stud bays blocked at the plates and dense-packed, the attic plane sealed, and the rim in the cellar closed. The bridge-era capes get knee walls, slopes and the flat. Stucco, Tudor and the two stone houses get everything but the walls.

How much does insulation cost in Leonia?

Most projects run $3,500 to $12,500. The drivers are the number of wall bays to block and dense-pack, whether the attic is a flat floor or knee walls and slopes, and how reachable the rim is in a rubble cellar. Knob-and-tube removal, where it is needed, is an electrician’s cost ahead of ours. We give a written scope and price after a free walk-through.

Are there insulation rebates in Leonia?

Leonia is PSE&G territory for gas and electric. PSE&G Whole Home Energy Solutions offers up to $7,500 in rebates plus 0% on-bill repayment of up to $25,000, and it starts with a PSE&G home energy assessment. Comfort Partners and PSE&G Home Weatherization do the work at no cost for income-qualified households. New Jersey’s IRA rebates have not launched, and the federal 25C credit ended for anything placed in service after 31 December 2025.

Our Leonia Heights house still has knob-and-tube. Can you insulate around it?

No. Live knob-and-tube depends on open air around the conductors to shed heat, and burying it in a dense-packed wall or under an attic floor is a fire risk, so it has to come out before we fill anything. That is an electrician’s job ahead of ours, and in a house built between 1899 and 1930 we assume it is there until we see otherwise. While it is being replaced, the rim in the cellar can usually go ahead; the walls and the attic floor wait.

Free energy audit in Leonia

We walk the attic and look at the fill and the wiring before anything else, then the knee walls, the cellar and the rim, and we check any 1930s to 50s attic flat for vermiculite. Then a written scope and a price. No charge, no obligation. If the walls have to wait for an electrician, we tell you that and price the rest.

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.

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