Crawl space encapsulation is a bigger job than the plastic on the ground suggests, and in Camden County it is a common one, because a great deal of the county was built without a basement under it. The land is low, flat coastal plain, and a builder working here in the 1950s, 60s or 70s could set a house on a slab or on two or three feet of block and skip the excavation. 31.3% of the county’s 213,188 units came out of the 1960s and 70s and 22.8% out of the 1940s and 50s, so the shallow crawl is a mid-century feature thousands of households live over.
What sits down there is usually the same: bare dirt, block walls with open vents, batts sagging out of the floor joists, and ductwork or a water heater keeping company with the humidity. In summer the outdoor air those vents let in carries more moisture than the cool surfaces below the floor can hold, and it condenses on joists, ducts and subfloor. Encapsulation closes that loop: the vents shut, the ground is covered and sealed, the walls and rim take the insulation instead of the floor, and something dries the air year-round.
Where crawl space encapsulation pays in Camden County houses
The post-1970 townships, where whole subdivisions sit on crawl spaces. Winslow Township, median year built 1985, is the county’s largest municipality and about 80% of it lies inside the Pinelands National Reserve; the Levitt-built sections around Sicklerville date from the 1970s, when 23.5% of the township went up. Gloucester Township, median 1978, and Voorhees, 47.6% built in the 1980s and 90s, add thousands more. These are the houses where the furnace, the water heater or the duct trunk lives in the crawl space, and sealing the space is what finally puts that equipment inside the building.
Mid-century ranchers and splits. Cherry Hill is 48.4% 1960s and 70s work and Gloucester Township 38.1%. Where those houses are not on slab they are usually on a low crawl with a dirt floor and 24 to 30 inches of headroom, which decides the price more than square footage does. Cold floors in February and a musty smell in July are one problem reported in two seasons.
The crawl space attached to a basement. In the older inner-ring towns a full cellar often stops where a later wing begins, and the rest of the footprint is crawl. Haddonfield is 51.0% pre-1940, Collingswood 46.5%, Haddon Township 26.9% and Pennsauken 18.9%, and the additions came later on shallower footings. An open doorway between a conditioned basement and a vented crawl means the basement is drawing crawl space air, so the two get treated as one space or separated properly.
Houses near the water. The county’s low point is sea level along the Delaware River, and the Cooper River runs between Haddonfield and Cherry Hill. In a flood hazard area the residential code requires flood openings in the walls enclosing an under-floor space, with a narrow exception for construction built to FEMA Technical Bulletin 11, and openings work against sealing. On low ground near the Delaware, the Pennsauken riverfront at Delair included, the flood zone gets checked at FEMA’s Flood Map Service Center before anything else is planned.
How we do crawl space encapsulation in Camden County
Water first, and it is not our trade. A liner over wet ground holds the water underneath it, and a dehumidifier removes vapor, not puddles. Grading that falls at least 6 inches in the first 10 feet, downspouts carried away from the wall, drains and sump pumps belong to a waterproofing contractor or a plumber, and they go in before we do. Where the water table can rise within 6 inches of the crawl space floor at the perimeter, the code wants the inside grade as high as the outside unless an approved drainage system is installed.
Then radon, which matters more once a space is closed. A vented crawl dilutes it with outdoor air and a sealed one can concentrate it, so the order is: test, mitigate if the number calls for it, seal, test again. The EPA says to fix a home at 4 picocuries per liter or more and to consider fixing between 2 and 4; the Department of Energy’s crawl space guidance is stricter, calling for mitigation at 2 or more before closing. A radon zone map does not answer the question for one address. Submembrane suction shares its membrane with our liner, so a mitigation contractor’s piping goes in before the plastic is sealed over it. Any gas or oil appliance down there gets checked by a heating contractor first, because a closed space changes where its combustion air comes from.
Our part starts with clearing: vegetation, wood forms, debris and the old floor insulation, out under containment through a HEPA insulation vacuum. Mold on the joists or sheathing is a remediation trade, and no coating over it counts as a fix. Then the shell. The rim joists and sill get air sealed, the vents are closed, and the walls and rim are insulated — closed cell spray foam at R-6.9 to R-7.1 per inch, or rigid board where the wall is flat enough to take it. A continuous Class I liner covers the ground, seams lapped at least 6 inches and taped, piers and pipe penetrations wrapped, edges carried at least 6 inches up the wall and sealed to the wall or the insulation. The access door is insulated and weatherstripped like any other part of the envelope.
Liner thickness is a durability decision, not a code one: the code sets a class, 0.1 perm or less, and names no mil. Plain 6-mil suits a space nobody enters again; a heavier or scrim-reinforced sheet earns its price where somebody kneels to service a sump pump or furnace. Where a termite inspection strip is wanted, we leave a band of bare wall above the foam — ask the pest company and the construction office before the walls are covered, not after.
What crawl space encapsulation costs in Camden County
Most of our projects run between $3,500 and $12,500, and on an encapsulation that covers our side: the liner, the wall and rim insulation, the air sealing, the vents and access door, and whatever comes out. Inside that range a Camden County crawl moves with floor area and wall height, the headroom a crew has to work in, the number of vents and piers, the liner weight, and how much wet batt and debris has to be hauled. Drying equipment, electrical work, drainage, radon mitigation and remediation are priced by the trades that do them. Our insulation cost guide breaks the envelope side down.
Rebates for crawl space encapsulation in Camden County
Utility territory splits the county on roughly the line the housing does. PSE&G bills both fuels in Pennsauken, Collingswood, Haddon Township, Haddonfield and most of Cherry Hill. Atlantic City Electric has the electric in Winslow Township, Voorhees and much of Gloucester Township, with South Jersey Gas on the gas side; the last two towns are split with PSE&G, so the account settles it. These programs fund a measured whole-house scope: the insulation and air sealing in a crawl space count toward it, the dehumidifier and the drainage do not.
PSE&G Whole Home Energy Solutions offers up to $7,500 in rebates with 0% on-bill repayment of up to $25,000, seven years at $10,000 or less and ten above that or for income-qualified customers, starting with an assessment by a BPI-certified contractor participating in PSE&G’s program; per-measure amounts are not published, and the free PSE&G Whole Home Energy Assessment is a lighter walk-through. South Jersey Gas Whole Home Energy Solutions pays up to $7,500 on a published formula — $2,000 at a modeled 5% saving plus $200 a point above that, capped at half the project cost — with 0% on-bill repayment of $2,500 to $25,000, an active account and gas heat, and a complimentary assessment. Atlantic City Electric Whole Home Energy Solutions reaches $7,500 with 0% financing of $2,500 to $25,000, single-family residences only, and publishes no formula or free walk-through.
Between 250% and 400% of the federal poverty guidelines, PSE&G Home Weatherization, the Atlantic City Electric Home Weatherization Program and South Jersey Gas Home Weatherization for Income-Qualified Customers do this class of work at no cost, and New Jersey Comfort Partners does the same at or below 250%, $82,500 for a family of four in 2026. New Jersey’s IRA Home Energy Rebates have not launched, and the federal 25C tax credit ended for anything placed in service after 31 December 2025. Ask any installer, ourselves included, whether they take part in the program you choose. The detail is in our New York and New Jersey rebate guide.
Code and climate in Camden County
Camden County is climate zone 4A, and the A stands for moist, which is the argument for closing a crawl space here rather than venting it. Under the 2024 IECC New Jersey adopted on 17 August 2026, a sealed crawl space wall in zone 4 takes R-10 continuous or R-13 cavity, about 1 1/2 inches of closed cell foam, against the R-15 continuous the northern counties need. Walls stay bare only where the space is vented and the floor above insulated.
The unvented crawl space is defined by two requirements: a continuous Class I vapor retarder over the ground, sealed and carried up the walls, and one drying method — a continuous exhaust fan at 1 cubic foot per minute per 50 square feet of floor, conditioned supply air at the same rate, the space used as a plenum in an existing house, or dehumidification sized to the manufacturer’s specifications. A liner and closed vents with nothing drying the air is not a legal unvented crawl space. A crawl that stays vented is at least rewarded for a ground cover: the required vent area drops from 1 square foot per 150 to 1 per 1,500. Foam on the walls can go without a thermal barrier only where the space is entered just for repairs and the product is tested for that use or covered by an ignition barrier. Foam plastic also needs a permit in New Jersey, which we pull as part of the job.
Towns we serve in Camden County
We encapsulate crawl spaces across Camden County; these eight have their own pages.
Common questions about crawl space encapsulation in Camden County
Who are the crawl space encapsulation contractors in Camden County?
We are one of them, for the envelope half of the job, with our own crew rather than a subcontractor’s: removal, air sealing, vents, wall and rim insulation, the liner and the access door. The dehumidifier or supply duct, the outlet it plugs into, the drainage, the radon system and any mold work are hired directly by you from those trades, and we give you the order they go in. That sequence is the part most quotes leave out.
How much does crawl space encapsulation cost in Camden County?
Most of our projects run between $3,500 and $12,500 for the insulation and liner side. A 30-inch crawl under a Gloucester Township rancher, dry ground and a few vents, sits low in that range; a large Winslow Township footprint with wet batts to remove, low headroom and a crawl opening into a finished basement sits high. The drying equipment and any drainage, electrical or radon work are separate prices from separate contractors, which is why two quotes can look so different.
Does a sealed Camden County crawl space need a dehumidifier?
It needs one of the four drying methods, and a dehumidifier is the usual pick here because most of these houses have no spare supply duct. The code sizes the unit to the manufacturer’s specifications: one maker rates a 70-pint crawl space model to 2,600 square feet tightly sealed and 1,800 loosely sealed, and capacity is measured warm, 70 pints at 80 degrees and 43.7 pints at 65. Crawl spaces run cool, so choose a model rated for low temperatures and plan the drain and the outlet before the liner goes down.
Is a vapor barrier enough, or does a Camden County crawl space need waterproofing first?
They answer different problems. A ground cover stops moisture rising out of the soil; it does nothing about the humid air the vents bring in all summer, which is what rots joists on this coastal plain. Standing water and a rising water table are a third problem again, and waterproofing is not our trade — grading, drains and sump pumps come from a waterproofing contractor or plumber first. Once the water is handled, the sealed version is the one that keeps performing: liner, closed vents, insulated walls and a drying method.
Free energy audit in Camden County
We go down there before we price anything: the ground and any sign of water and where it came from, the vents, the rim joists, what is left of the floor insulation, the piers, the headroom, and every duct, pipe and appliance sharing the space. We check how the crawl connects to a basement or garage, and whether the house sits low enough to need its flood zone read. You get a written scope, the order the other trades work in, and our price.
Call 914-554-2289 or use the contact form, 8am–8pm, seven days. The Home Insulators is family-owned in New Rochelle, NY, with a 100-plus-person in-house crew; we never subcontract.
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