The Home Insulators

Insulation Contractors in Gloucester County, NJ

The median Gloucester County home was built in 1979, and no single era owns the county. 26.2% of its 117,530 housing units came out of the 1960s and 70s, 26.6% out of the 1980s and 90s, 15.4% from the 1940s and 50s and 22.0% since 2000. 51.4% was standing before New Jersey’s first statewide energy subcode of 1 January 1978. Two houses four miles apart here can need opposite work.

The county is low-rise and it is owned. 73.5% of units are detached houses and 7.7% attached, only 5.5% sit in two- to four-unit buildings and 4.8% in buildings of twenty or more, and 79.4% of occupied homes are owner-occupied. 2,685 units, 2.3%, are mobile or manufactured homes. Gas heats 77.8% of occupied homes, electricity 10.5%, fuel oil 8.5% and bottled gas 2.0%. The person who answers the door here is usually the person who can say yes to the work.

The county runs from the Delaware River southeast across the coastal plain to the edge of the Pine Barrens, all of it low ground; the high point is about 180 feet. It works as three markets. The river end — Deptford, West Deptford and the boroughs around Woodbury, founded in 1683 — is early post-war Philadelphia suburb. The middle, along Route 42 and Route 55, is subdivision country: Washington Township, Mantua Township and Glassboro, where Rowan University has set the pace since 1923. The outer edge at Turnpike Exit 2, Woolwich and Harrison Township, was farmland until the 1990s, and Monroe Township sits alone in the pines. The eight town pages carry the detail.

The Gloucester County towns we work in

Each one gives the town’s numbers, the assemblies that fail there, and which utility pays.

  • Washington Township — 44.1% built in the 1980s and 90s, with the air handler in a vented attic.
  • Monroe Township — 8.5% mobile homes, 8.7% on oil, and Williamstown ranches sitting on vented crawl spaces.
  • Deptford — 18.7% built in the 1950s, plus attics still unfinished under roofs rebuilt after the 2021 tornado.
  • West Deptford — 20.8% heat with electricity, double the county share, in Colonial Manor capes and 1970s splits.
  • Glassboro — 59.9% owner-occupied and 13.6% in apartment blocks; our work is the glass-town houses and post-war capes.
  • Mantua Township — 16.4% built in the 1950s, 24.1% in the 1990s, and 406 manufactured homes with belly-board losses.
  • Harrison Township — 45.2% built since 2000: walls already full, so the job is attic ducts and bonus rooms.
  • Woolwich Township — 76.2% built since 2000; the money is in attic ducts, bonus rooms and party walls.

The houses across Gloucester County

The oldest suburban layer sits at the river end and along the older county roads. Deptford is 22.8% 1940s and 50s, 18.7% of it in the fifties alone; West Deptford 20.9%, Mantua Township 20.9%, Glassboro 15.7%. These are small capes, ranches and story-and-a-half houses on modest lots. A cape fails at the knee wall: batts facing the room with nothing behind them, floor joists running out to an open eave, unbaffled slopes and a shallow flat attic above, so three planes leak and only one shows from the hatch. The ranch of the same years fails across a long attic of loose-fill settled below its rated depth, with open top plates, an unblocked chimney chase and a bare hatch.

What is underneath matters as much. This is coastal-plain ground, and a great many of the older houses sit on a crawl space or a slab instead of a full basement. The standard failure is batts stapled between the floor joists that have sagged out of contact, bare soil pushing moisture up all summer, and ductwork leaking into the same vented space. We seal the vents, lay a ground cover, insulate the crawl walls and rim, and bring the crawl inside the house. On a slab house there is no floor to work on at all, so the attic plane and the ducts carry the job.

The 1960s and 70s brought the split-level and the bi-level, the houses people insulate twice and still find cold. Washington Township is 36.2% of that era, West Deptford 32.6%, Monroe Township 30.9%, Deptford 27.9%. A split has two or three attic planes at different heights with knee walls between them, so blowing the highest one leaves most of the ceiling area untouched. A bi-level puts a half-height wall against grade with a rim above it, a bedroom over the garage on joist bays open at the garage wall, and a chase running unblocked to the roof.

Then the county’s biggest cohort: 26.6% built in the 1980s and 90s, which is 44.1% of Washington Township, 38.3% of Mantua Township, 33.3% of Harrison Township and 31.5% of Glassboro. These came insulated, which is why owners assume there is nothing to do. R-11 to R-13 walls and R-19 to R-30 on the attic floor was the code of the day, and depth is not the main loss anyway. The air handler and supply trunk often sit on a platform in the vented attic, outside the envelope, and that one detail explains most of the cold upstairs bedrooms in this county. Add unbaffled cathedral and tray slopes, recessed cans, a dropped soffit over the kitchen cabinets, bath fans discharging into the attic and a bare plywood stair door, and you have the standard scope.

22.0% of the county has gone up since 2000, concentrated in Woolwich Township at 76.2%, Harrison Township at 45.2%, Monroe Township at 27.0% and Glassboro at 25.8%. Those walls were filled before the drywall went on, and nobody improves them by drilling; what was skipped is the air barrier and the duct run. At the other end, 9.8% of the county predates 1940 — the farmhouses and village houses of Woodbury, Swedesboro and Mullica Hill — balloon-framed, with knob-and-tube in some, where the wiring is settled before anything goes into a wall.

Three forms sit outside the ordinary job: the 2,685 manufactured homes, 8.5% of Monroe Township and 6.8% of Mantua Township, priced on belly and duct repair rather than depth; the apartment blocks that make up 13.6% of Glassboro and 11.1% of West Deptford, where the envelope belongs to a board or a landlord; and the electrically heated houses, 20.8% of West Deptford against 10.5% countywide, which have no gas account to bring to a gas utility’s program.

We seal before we insulate

Insulation slows heat moving through a surface. It does nothing about air moving through a gap. Bury the ducts in a Washington Township attic under a foot of new fill, leave the joints and the platform open, and the bedrooms are no warmer in January.

In the county’s dominant house, the 1980s or 90s colonial, the sequence is: seal the duct joints, boots and plenum with mastic, close the air handler platform and the return chase, seal the top plates, the soffit drop over the kitchen, the flue chase, the cans and the bath fans, baffle the eaves and tray slopes, then insulate to depth. In a post-war cape it is the joist bays under the knee wall; in a crawl-space ranch the vents, the ground and the crawl walls; in a townhouse the party wall at the attic plane.

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

What insulation costs in Gloucester County

Most of our projects run between $3,500 and $12,500. Across Gloucester the number moves with the attic’s shape and area, the feet of ductwork in unconditioned space, whether a bonus room over the garage or a run of tray slopes is in the scope, whether a crawl space has to be cleared and closed, and how many separate planes the house has — a split’s three attics against a ranch’s one. The foam side is broken out in what spray foam insulation costs.

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 Gloucester County

Gloucester is an Atlantic City Electric and South Jersey Gas county with a PSE&G corner on the Delaware River. Atlantic City Electric has the electric in 18 of the 24 municipalities, Washington Township, Monroe Township, Glassboro, Mantua Township, Harrison Township and Woolwich Township among them; PSE&G has it in Deptford, West Deptford, Woodbury, Woodbury Heights, Westville and National Park. South Jersey Gas has the gas in 20 of the 24, including most of Deptford; PSE&G has it in West Deptford, Woodbury, Westville and National Park. Deptford is split both ways inside one township, so there the bill settles it, not the map.

South Jersey Gas Whole Home Energy Solutions pays up to $7,500 per project and publishes its arithmetic: $2,000 once the model shows a five percent saving, then $200 for every further percentage point, capped at $7,500 and at half the project cost. It adds 0% on-bill repayment of $2,500 to $25,000, seven years up to $10,000 and ten above that. It needs an active account and gas heat, and covers houses, townhomes, condos and buildings under four units. Customers also get a complimentary Whole Home Energy Assessment.

Atlantic City Electric Whole Home Energy Solutions pays to the same $7,500 ceiling, no more than half the project cost, with 0% financing of $2,500 to $25,000. It publishes no per-measure formula, states no free walk-through, and is written for single-family residences only, with no separately metered unit above or below, so a townhouse owner in Woolwich or Washington Township goes to the gas side. It does not require gas heat, which makes it the door for the oil and propane houses of Monroe Township and Mantua Township.

In the PSE&G towns, PSE&G Whole Home Energy Solutions offers up to $7,500 in rebates plus 0% on-bill repayment of up to $25,000. It starts with an assessment by a BPI-certified contractor participating in PSE&G’s program, and PSE&G publishes no per-measure amounts. PSE&G’s Whole Home Energy Assessment is free once a year for a residential customer in a home of fewer than five units, and it covers electric heat as well as gas, which matters in West Deptford. Where the gas and the electric come from two different companies, either program can take the job; start with whoever bills your heating fuel and confirm with the other.

For income-qualified households the work can be free. PSE&G Home Weatherization, the Atlantic City Electric Home Weatherization Program and South Jersey Gas Home Weatherization for Income-Qualified Customers each install insulation, air sealing and duct sealing at no cost between 250% and 400% of the federal poverty guidelines. New Jersey Comfort Partners does the same at or below 250%, $82,500 a year for a family of four in 2026, and refers homes on oil, propane or kerosene to the state weatherization office. New Jersey’s IRA Home Energy Rebates have not launched; the state’s own page has them in development and not open for applications. The federal Section 25C tax credit ended for anything placed in service after 31 December 2025, whatever a flyer still says. The rest is in our New York and New Jersey rebate guide.

Code and climate in Gloucester County

51.4% of Gloucester County was built before New Jersey’s first statewide energy subcode of 1 January 1978, and in the river towns the share is higher still — 55.7% of Deptford. Gloucester County is climate zone 4A, the milder coastal-plain zone, so the cooling season carries a real share of the savings and a hot vented attic full of ductwork costs money in July as well as January.

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 in the 4A counties, 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.

An existing house falls under New Jersey’s Rehabilitation Subcode: insulating an attic does not require bringing the rest of the house to code, and no 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 Gloucester County

Do you install insulation in Gloucester County, NJ?

Yes, in the eight towns listed above and the county around them: the post-war capes and crawl-space ranches of the river end, the splits and bi-levels of the 1960s and 70s, the 1980s and 90s colonials with the air handler in the attic, the post-2000 subdivisions of Woolwich and Harrison Township, and the balloon-framed farmhouses of the old villages. Apartment buildings and manufactured homes are the two forms where we often say no, and we say it on the phone rather than after a visit.

How much does insulation cost in Gloucester County?

Most projects run $3,500 to $12,500. The drivers are the attic area and how many separate planes it has, the feet of duct running through unconditioned space, whether a bonus room over the garage or a run of tray ceilings is in the scope, and whether a crawl space has to be cleared, sealed and insulated. A 1950s cape is priced on knee wall and eave footage; a 2005 colonial on ducts and top plates. Every price follows a free walk-through and comes in writing.

Are there insulation rebates in Gloucester County?

Yes. South Jersey Gas, Atlantic City Electric and PSE&G all run Whole Home Energy Solutions at up to $7,500 per project for owner-occupied homes, with 0% financing on top. South Jersey Gas publishes its formula and gives customers a complimentary Whole Home Energy Assessment; PSE&G’s assessment is free once a year; Atlantic City Electric states no free walk-through and takes single-family houses only. Income-qualified households can have the work done at no cost through the utilities or New Jersey Comfort Partners.

Which utility do I have in Gloucester County?

Most of the county is Atlantic City Electric for electric and South Jersey Gas for gas, including Washington Township, Monroe Township, Glassboro, Mantua Township, Harrison Township and Woolwich Township. The Delaware River towns are PSE&G: West Deptford on both bills, and Deptford, Woodbury, Westville and National Park on one or both. Deptford is split two ways inside its own borders. Accounts near a boundary can be served across the line, so read the bill rather than the map, and tell us both companies when you call.

Free energy audit in Gloucester County

We start in the attic: depth and coverage, the perimeter and top plates, the eave baffles, the stair door, the cans and bath fans, then every foot of duct and the platform the air handler stands on. We look behind knee walls in the capes and splits, under a bonus room or a garage-side bedroom, and underneath at the crawl space, the slab edge or the rim. Then you get a written scope and a price, with no charge and no obligation.

Call 914-825-6824 or use the contact form. Open 8am–8pm, seven days. We work 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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