The Home Insulators

Insulation Contractors in Union County, NJ

Union County was built after the Second World War. 34.8% of its 211,269 housing units went up in the 1940s and 50s, 47,380 of them in the 1950s alone, and another 20.6% followed in the 1960s and 70s. 24.1% predates 1940. Together that puts 79.5% of the county on the ground before New Jersey’s first statewide energy subcode of 1 January 1978: four houses in five framed with no insulation requirement at all. The median unit dates from 1956.

The stock is simpler than Essex next door. Detached houses are 49.7% of it, 105,038 of them, with 5.0% attached. 35,836 units sit in two-unit buildings and 16,593 in buildings of three or four, 24.9% between them, and only 12.6% are in buildings of twenty or more. 57.6% of occupied homes are owner-occupied. Gas heats 82.1% of them, electricity 10.3%, oil 4.2% and bottled gas 2.0%, so the bill this work is aimed at is almost always a gas bill.

The ground explains the rest. Most of Union is flat and low-lying; the Watchung Mountains cross only the northwestern corner, where the high points, two areas about 560 feet up, sit in Berkeley Heights, and the lowest ground is sea level at the Arthur Kill. The Rahway and Elizabeth Rivers and Robinson’s Branch run between them. It works as three markets: the two-family cities on the tidal flats east, the post-war tract belt across the middle, and the older ridge towns northwest, where the gas company changes with the elevation. The ten town pages carry the detail.

The Union County towns we work in

Each page sets out that town’s numbers, the assemblies that fail there, and which company bills the heat.

  • Elizabeth — 47.1% of the city is two- to four-family; the owner-occupied side of that stock is the work.
  • Union Township — 41.7% built in the 1940s and 50s; capes whose dormers and additions were never tied together.
  • Linden — a two-family city: 26.1% of units in two-unit buildings, sealed as one envelope, stair chase included.
  • Westfield — 36.0% predates 1940, with balloon-framed walls and floored walk-up attics that need a decision first.
  • Cranford — 86.3% predates 1980 and 6.9% still burns oil, on low ground along the Rahway River.
  • Scotch Plains — 33.3% built in the 1950s alone; split-levels here hide four separate roof cavities, not one attic.
  • Summit — a third of the city predates 1940: balloon-framed ridge houses, garrets, knee walls and 6.3% oil heat.
  • Clark — only 3.0% predates 1940; split-levels with two attics and an uninsulated wall between the roofs.
  • New Providence — no home on oil and 87.6% on gas, with 11.9% of all units built in the 2010s.
  • Berkeley Heights — 95.5% owner-occupied: wind-washed eaves on the Watchung ridge, wet crawl spaces down in the valley.

The houses across Union County

The post-war cape and ranch is the county’s house, and every town on the list has a stack of it. Union Township is 41.7% 1940s and 50s, Clark 41.0%, Scotch Plains 40.7%, Cranford 40.1%, Summit 37.5%, Linden 36.8%. A cape fails at the knee wall: batts on the room side with no air barrier behind, floor joists running out under the bedroom to an open eave, unbaffled slopes and a shallow flat attic over the middle — three attics pretending to be one. A ranch fails across one long low attic where the loose-fill has settled to half its depth, the top plates, flue chase and bath fan were never sealed, and wind has pushed the insulation off the outer three feet of every ceiling.

The 1960s and 70s, 20.6% of the county, brought the split-level. Clark is 38.3% 1960s and 70s, Berkeley Heights 34.7%, New Providence 32.0%, Scotch Plains 27.1%. A split is not one attic. It is two or three roof cavities at different heights with an uninsulated stepped wall between them, a bedroom over an unheated garage, and a band joist between levels nobody has touched. Depth over the top bedrooms with that stepped wall bare is the most common half-finished job we are called to repair.

Under the older half of the county is balloon framing. Westfield is 36.0% pre-1940, Summit 33.4%, Cranford 30.8%, Elizabeth 27.5%, Union Township 20.9%, Linden 20.7%. In those houses the stud bays run from the sill plate to the attic floor without a fire stop, so each exterior wall is a chimney: cellar air enters low and leaves at the top plate, and whatever lies on the attic floor sits in that draft. They come with plaster on lath, a stone cellar and a bare rim joist, a floored walk-up attic to be lifted or bypassed at the roof line, and knob-and-tube wiring often enough that we assume it until an electrician says otherwise. Summit, at 87.0% pre-1980, has the largest pre-code share of the ten.

East of the Parkway the two-family takes over. 17.0% of the county’s units sit in two-unit buildings and 7.9% in buildings of three or four. Elizabeth is 47.1% two- to four-family, Linden 33.5%, Union Township 19.4%. An up-and-down two-family is one envelope, not two: a stair chase open from the cellar to the roof at every landing, a floor cavity between the units running wall to wall, a low-slope roof with barely two inches above the top ceiling, and a shared cellar. We price it as a single building. Ownership decides whether it can happen at all, which is why Elizabeth’s 25.4% owner-occupied share matters more than its 48,940 units.

Two patterns finish the picture. Oil is 4.2% countywide and clusters on the older, lower ground — Cranford 6.9%, Summit 6.3%, Linden 5.8%, Clark 5.1%, against 0.0% in New Providence — and an oil-heated house pays more for every unit of heat it loses, so the same scope pays back faster there. And low ground is wet ground: along the Rahway River and Robinson’s Branch, basements and crawl spaces take water, which decides materials. Closed cell foam does not go against a foundation wall that floods, and a wet crawl space is drained and sealed first.

We seal before we insulate

Insulation slows heat moving through a surface. It does nothing about air moving through a gap. Blow a Scotch Plains split to full depth over the bedrooms, leave the stepped wall between roof levels bare, and the cold still arrives from the side.

In the county’s dominant house, the post-war cape, the sequence is: block the joist bays under the knee wall so the eave stops washing under the bedroom floor, put a rigid air barrier on the back of the knee wall, baffle the slopes, seal the top plates, chimney chase and bath fans at the flat attic, then insulate. In a split it starts at the stepped wall and the band joists; in a two-family at the stair chase and the floor between the flats; in a balloon-framed house by plugging the wall cavities top and bottom.

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

What insulation costs in Union County

Most of our projects run between $3,500 and $12,500. Across Union the number turns on how many roof cavities the house actually has — a cape’s three or a split’s four against a ranch’s one — the feet of knee wall, eave and stepped wall to block before anything is blown, whether a stair chase and an inter-floor cavity are in the scope, and whether a walk-up attic has to be lifted or old wiring replaced. A two-family is priced as one building. See what spray foam insulation costs for the foam side of the price.

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 Union County

Three utilities serve the county and they split along the same line. Electricity is PSE&G in seventeen of the twenty-one municipalities, including Elizabeth, Linden, Union Township, Westfield, Scotch Plains, Cranford and Clark; it is JCP&L in Berkeley Heights, New Providence, Summit and Springfield. Gas is Elizabethtown Gas in sixteen municipalities, those seven among them, and PSE&G in Berkeley Heights, New Providence, Summit, Springfield and Plainfield. So the northwestern ridge towns pair JCP&L electric with PSE&G gas, and the rest of the county pairs PSE&G electric with Elizabethtown Gas.

A house whose gas and electric come from two different companies can go through either one’s Whole Home Energy Solutions program. Start with whichever utility bills you for the fuel you are trying to burn less of — for the 82.1% of the county on gas heat, that is Elizabethtown Gas or PSE&G — and confirm with the other. The ceiling is the same everywhere, up to $7,500 per project, and every project must include air sealing along with the envelope work the assessment calls for.

Elizabethtown Gas Whole Home Energy Solutions publishes its formula: $2,000 for a modeled five percent energy saving plus $200 for every percentage point above that, capped at $7,500 and at half the project cost, with 0% on-bill repayment of $2,500 to $25,000, up to 7 years for $10,000 or less and up to 10 above that or for income-qualified customers. It needs an active Elizabethtown Gas account and gas heat, and covers a house, townhome, condo or a building under four units. JCP&L Whole Home Energy Solutions uses the same formula and cap on the electric side in the ridge towns, with 0% on-bill financing of $2,500 to $25,000.

PSE&G Whole Home Energy Solutions publishes no formula. It pays up to $7,500 in rebates toward air sealing and insulation plus 0% on-bill repayment of up to $25,000, over 7 years for a project of $10,000 or less and 10 years above that, with no per-measure amounts published, so “up to $7,500” is as precise as anyone can be. It starts with an assessment by a BPI-certified contractor in PSE&G’s program, who sets that fee. Read the gas-heat requirement carefully if you are one of the 4.2% on oil or the 2.0% on propane: the gas utility program is closed to you, and the electric side is the way in.

Note which visit is free. It is the lighter walk-through called the Whole Home Energy Assessment, offered at no cost by Elizabethtown Gas, PSE&G and JCP&L, with small items installed on the spot; the deeper Whole Home assessment behind the rebate carries a contractor-set fee. Below those sit the no-cost programs: Elizabethtown Gas Home Weatherization for Income-Qualified Customers and JCP&L Home Weatherization for Income-Qualified Customers each cover up to $14,000 in upgrades and $2,500 in health and safety repairs for households between 250% and 400% of the federal poverty guidelines, $82,501 to $132,000 for a family of four, and PSE&G Home Weatherization serves the same band. New Jersey Comfort Partners works at no cost at or below 250%, $82,500 for a family of four; homes on oil, propane or kerosene go to the state’s weatherization office.

The New Jersey IRA Home Energy Rebates have not launched — the state’s own page says they are in development and not open for applications. The federal Section 25C tax credit ended for anything placed in service after 31 December 2025, so there is no federal insulation credit on a 2026 job, whoever is still advertising one. What is live is in our New York and New Jersey rebate guide.

Code and climate in Union County

79.5% of Union County’s housing was standing before 1980, and New Jersey’s first statewide energy subcode took effect on 1 January 1978. Whatever is in those walls and attics was put there by a builder deciding how much to spend. Union is climate zone 4A; Morris and Somerset over the line are 5A.

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 — walls at R-30 in the cavity or R-20 plus R-5 continuous, windows at U-0.30 for a 4A county, and air leakage of 3.0 air changes per hour at 50 pascals. A complete permit application filed under the old code is still accepted until about 16 February 2027.

Existing homes fall under New Jersey’s Rehabilitation Subcode. Insulating an attic does not oblige anyone to bring 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 what the state considers right for this climate, and what we design to.

Common questions about insulation in Union County

Do you install insulation in Union County, NJ?

Yes, in the ten towns listed above and the municipalities around them. The work is the post-war cape and ranch that makes up a third of the county, the split-level with its stepped wall and its room over the garage, the balloon-framed pre-1940 house in Westfield, Summit and Cranford, and the owner-occupied two-family in Elizabeth and Linden. A unit in a building of twenty or more, where a board owns the envelope, is not a job one homeowner can order.

How much does insulation cost in Union County?

Most projects run $3,500 to $12,500. What moves the number is how many roof cavities the house has, since a split-level can hide four and a ranch has one; the feet of knee wall, eave and stepped wall to block before anything is blown; whether a stair chase and the floor between two flats are in the scope; and whether a walk-up attic has to be lifted or old wiring replaced. A two-family is priced as one building.

Are there insulation rebates in Union County?

Yes. Most of the county goes through Elizabethtown Gas Whole Home Energy Solutions, which pays $2,000 at a modeled five percent saving plus $200 for each point above that, up to $7,500 and no more than half the job, with 0% on-bill repayment of $2,500 to $25,000. Berkeley Heights, New Providence and Summit use PSE&G gas and JCP&L electric, both with the same $7,500 ceiling. Comfort Partners works at no cost at or below 250% of the federal poverty guidelines.

Which utility do I have in Union County?

Electricity is PSE&G in seventeen of the twenty-one municipalities and JCP&L in Berkeley Heights, New Providence, Summit and Springfield. Gas is Elizabethtown Gas in sixteen and PSE&G in those same four plus Plainfield. So Elizabeth, Linden, Union Township, Westfield, Scotch Plains, Cranford and Clark are PSE&G electric with Elizabethtown Gas, while the ridge towns are JCP&L electric with PSE&G gas. Accounts near a boundary are sometimes served across the line, so read the bill rather than a map.

Free energy audit in Union County

We count the roof cavities first, because a cape has three and a split can have four, then look at the knee walls, the eaves, the stepped wall between roof levels, the band joists, the hatch and the ceiling under any room over a garage. Then the basement or crawl space, the rim joist and how dry the ground is there. In a two-family we add the stair chase and the floor between the flats. Then a written scope and a price, no obligation.

Call 914-825-6824 or use the contact form. Open 8am–8pm, seven days. We are family-owned, working out of New Rochelle, NY with a 100-plus in-house crew we never subcontract, and we hold manufacturer installer certifications from the spray foam manufacturers we use.

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