Basement Finishing Cost in South Jersey (2026)

What finishing a basement costs

A finished basement adds living space without building new walls, a floor or a roof, which is why it usually costs less than an addition of the same size. For a published benchmark:

In the Middle Atlantic region, a basement remodel cost about $60,644, according to the Remodeling 2025 Cost vs. Value Report (www.costvsvalue.com).© 2025 Zonda Media, a Delaware Corporation. Complete data from the Remodeling 2025 Cost vs. Value Report can be downloaded free at www.costvsvalue.com.

Where a project lands around that number depends on what the basement becomes (one open room, or several rooms with a bathroom, bedroom and bar) and on what the basement needs first: drainage or a sump pump, an egress window for any bedroom, and an ejector pump if a bathroom sits below the sewer line.

Moisture comes first

Nothing should be framed or drywalled over a wet basement. A basement that floods needs interior drainage and a sump pump before any finishing starts; a damp one needs the right vapor control and insulation; a dry one needs neither. Stone foundations in older homes can be managed but rarely made bone-dry, so the finish has to be built for that. A walkthrough should look at the walls, the floor and the grading outside before anyone prices drywall.

Ceiling height and the building code

New Jersey uses the International Residential Code, New Jersey Edition. Section R305.1 sets the minimum ceiling height: 7 feet for habitable space, 6 feet 8 inches for bathrooms and laundry rooms, with beams, girders and ducts allowed down to 6 feet 4 inches above the finished floor. Parts of a basement without habitable space need 6 feet 8 inches, or 6 feet 4 inches at beams and ducts (R305.1.1). Making a low basement habitable means lowering the floor (underpinning), which is the most expensive thing a basement project can involve.

Bedrooms need an escape window

Section R310.1 requires an emergency escape and rescue opening in every sleeping room, including sleeping rooms in basements. The New Jersey edition does not require one for a basement family room or office. The opening needs at least 5.7 square feet of clear opening, 24 inches of clear height and 20 inches of clear width, with the sill no more than 44 inches above the floor, and a below-grade opening needs a window well of at least 9 square feet (R310.2, R310.4). In a home with an automatic sprinkler system, a basement bedroom is excused only if the basement has one code-compliant way out plus an escape opening, or two ways out. Details: what a basement bedroom needs in New Jersey.

Why basements vary more in older towns

Age drives basement cost more than any other room, because older homes are more likely to have low ceilings, stone or block walls, moisture and older wiring. Census data shows how different the housing is across the towns we work in:

Homes built before 1978 also fall under the EPA's lead-safe renovation rule for any work that disturbs painted surfaces, including basement stairs, trim and walls.

The work costs the same to build in each of these towns; the housing is what differs.

Basement finishing cost in Haddonfield

In Haddonfield, the median home was built in 1938, 87% of homes were built before 1980, and the median home value is $755,300 (Census ACS 2024 5-year). In practice, most homes here predate 1980, so opening walls often turns up original supply lines, older wiring and paint that falls under EPA's lead-safe renovation rule (homes built before 1978). More on remodeling in Haddonfield.

Basement finishing cost in Pitman

In Pitman, the median home was built in 1945, 89% of homes were built before 1980, and the median home value is $279,300 (Census ACS 2024 5-year). In practice, most homes here predate 1980, so opening walls often turns up original supply lines, older wiring and paint that falls under EPA's lead-safe renovation rule (homes built before 1978). More on remodeling in Pitman.

Basement finishing cost in Cherry Hill

In Cherry Hill, the median home was built in 1968, 73% of homes were built before 1980, and the median home value is $386,300 (Census ACS 2024 5-year). In practice, more than half the homes predate 1980, so older plumbing, wiring and pre-1978 paint are common once walls are open. More on remodeling in Cherry Hill.

Basement finishing cost in Voorhees

In Voorhees, the median home was built in 1983, 38% of homes were built before 1980, and the median home value is $429,700 (Census ACS 2024 5-year). In practice, the housing is mixed: older homes carry the hidden-condition risk of pre-1980 construction, while newer ones usually open up cleanly. More on remodeling in Voorhees.

Basement finishing cost in Washington Township

In Washington Township, the median home was built in 1982, 43% of homes were built before 1980, and the median home value is $337,600 (Census ACS 2024 5-year). In practice, the housing is mixed: older homes carry the hidden-condition risk of pre-1980 construction, while newer ones usually open up cleanly. More on remodeling in Washington Township.

Permits

Finishing a basement means framing, wiring and usually plumbing, none of which is ordinary maintenance (N.J.A.C. 5:23-2.7), so it needs a construction permit (N.J.A.C. 5:23-2.14), with the framing, rough electrical, rough plumbing and final inspections. The permit belongs in the quote. More: when a New Jersey remodel needs a permit.

Why the cheapest basement quote is the riskiest

The cheapest way to finish a basement is to skip the moisture work and drywall straight over a damp wall. It looks fine for a couple of years, then the baseboards swell and the finish has to come out. A quote that comes in far below the others usually leaves out the drainage, the vapor control or the sump. Ask each contractor how water is handled before a wall goes up.

Is a finished basement worth it at resale?

In the Cost vs. Value numbers above, the basement remodel recouped 63.4% of its cost at resale in the Middle Atlantic region.

Basement or addition?

If the basement is dry and tall enough, finishing it is almost always the cheaper way to add space. If it is not, compare it with an addition: our home additions cost guide has the numbers.

Get a price for your basement

We start with the basement itself: moisture, ceiling height, foundation, drains and electrical, then price the space you want. Estimates are free. Request a basement estimate, call (856) 214-9156, or see our basement remodeling page.