The Short Answer
If your finished basement will contain a bedroom, it needs a code-compliant emergency escape and rescue opening, and the little hopper window above the laundry sink does not count.
That requirement shapes where the bedroom can go, what the project costs, and whether the work passes inspection. An egress window is not a window purchase. It is excavation, a structural opening cut through the foundation, a window, a well, a drain, and restored grade, in that order.
Burlington County housing stock runs from older block-foundation homes in Burlington City and Riverside to later poured-wall colonials across Mount Laurel, Moorestown, Medford, and Evesham. Your foundation type changes the method, the schedule, and the price more than the window you pick.
Why Egress Decides Your Basement Layout
Most homeowners design the basement first and discover the egress requirement second. That order is expensive, because the opening has to go where the ground outside is workable.
Where the Opening Can Actually Go
The window has to land on an exterior foundation wall with enough exposed depth for a compliant opening, and with room outside for a well that is not under a deck, a driveway, an A/C condenser, a gas meter, or the property line. On a tight lot there may be only one or two viable walls. Find them before you draw a bedroom.
Bedroom Versus Habitable Space
A sleeping room triggers the requirement without question. A basement finished as a family room, office, or gym is murkier ground that depends on the code edition your township enforces and how its construction office reads it. Get that answer from the township rather than assuming it.
Sequence Matters
The opening, the well, and the drainage all get solved before framing, insulation, and drywall. Doing egress after the room is finished means cutting back into completed work. In a full basement finishing project, egress belongs in the first phase, alongside water management.
Planning a Basement Bedroom?
Altieri & Sons Construction handles basement finishing and window and door installation throughout Burlington County and the surrounding South Jersey area. We will walk the foundation with you and show you where egress can realistically go.
What the Code Actually Requires
New Jersey builds its residential requirements on the International Residential Code, administered through the state's Uniform Construction Code and enforced by your municipal construction office. The figures below govern an emergency escape and rescue opening in most editions. Confirm them against the edition your township enforces before ordering anything.
- Net clear opening area: generally 5.7 square feet, with a reduced 5.0 square foot allowance for grade-floor and below-grade openings under some code editions.
- Net clear height: at least 24 inches.
- Net clear width: at least 20 inches.
- Sill height: no more than 44 inches above the finished floor.
- Operation: openable from inside without tools or keys.
Net Clear Is Not Rough Opening
This is where projects fail inspection. Net clear opening means the actual hole a person can pass through with the sash fully open. It is smaller than the rough opening and smaller than the unit size on the sticker, because frame, sash, and hardware all eat into it. A window can satisfy the area figure and still fail the 24-inch height minimum, or clear both and fail on sill height. Verify net clear dimensions from the manufacturer's data for the exact unit.
Finished Floor, Not Slab
The 44-inch sill measurement is taken from the finished floor. Adding a subfloor panel system or thick flooring over the slab changes that height, so account for the finished assembly when the opening is laid out, not after the floor goes in.
Window Wells, Ladders, and Covers
Below-grade openings need a window well, and the well's requirements are as enforceable as the window's.
Well Size
A well serving an escape opening generally needs a minimum horizontal area of 9 square feet with a minimum projection and width of 36 inches, so the window can open fully and still leave room to stand and climb. A well sized to the window instead of to the code is a common and avoidable failure.
Ladders and Steps
A well deeper than 44 inches needs a permanently affixed ladder or steps, and those are detailed too: typically at least 12 inches wide, projecting at least 3 inches from the wall, with rungs no more than 18 inches apart vertically. Homes with high foundation walls almost always land in ladder territory, which is a cost driver worth knowing early.
Covers
A cover is not required by code in every case, but in South Jersey it is close to mandatory in practice. An uncovered well collects leaves, rain, snow, and the occasional animal, and it is a fall hazard in the yard. A clear polycarbonate cover keeps weather out, lets daylight through, and must open from inside the well without tools. Covers that screw down from the outside defeat the escape path and do not belong on an egress well.
Which Window Type Fits Your Foundation
Three unit types cover nearly every below-grade installation, and the choice follows the wall and the well, not taste.
Casement
A casement swings out on side hinges and delivers the most net clear opening per unit of wall removed, which makes it the workhorse for egress. Because the sash swings into the well, the well needs enough projection that the open sash does not block the climb.
Sliding
A horizontal slider opens half its width, so it needs a wider opening to reach the same net clear area. It suits a foundation band that is short and wide, where a swinging sash would crowd the well.
In-Swing Hopper
Egress-rated in-swing units open into the basement, keeping the well clear. They are the common answer in tight wells, and they require keeping furniture and storage clear of the opening inside.
Whatever the type, cutting the wall is structural work. In a poured foundation the opening is saw-cut to a layout that respects the load above and carried by a properly sized lintel or header; masonry block is detailed differently again. That belongs with a contractor who does concrete and foundation work, not a window installer alone.
Planning Cost Ranges in Burlington County
As a planning range rather than a quote, a complete below-grade egress installation in South Jersey commonly lands in the low-to-mid four figures, and involved jobs run higher. Treat any single number you see online with suspicion: the spread comes almost entirely from site conditions. What actually moves the price:
- Foundation material. Cutting poured concrete costs more than cutting block, and both cost more than enlarging an existing opening.
- Well depth. Deeper means more excavation, more spoil to remove, a taller well assembly, and a ladder.
- Access. A wall a machine can reach is cheaper than one dug by hand between a fence and a patio.
- Drainage. Tying the well drain to a perimeter drain, a sump, or daylight is work you least want skipped.
- Restoration. Backfill, grading, landscaping, and interior trim and drywall are separate line items.
A written estimate should name each of those items. If it is a single number with the word "egress" next to it, ask what happens to the water and who restores the grade. For how egress fits a larger budget, see our breakdown of basement finishing costs.
Permits and Inspections
Cutting a new opening in a foundation wall is permitted work. In New Jersey, permits are issued and inspected by the municipal construction office in your own town, so the counter in Mount Laurel is not the counter in Medford or Moorestown, and submission details vary even though the underlying code does not.
Expect the application to cover the structural opening, the window, and usually the broader basement scope with its own building, electrical, and sometimes plumbing and fire subcode reviews. Inspections happen at defined stages, which is another reason egress goes in before walls close up. A contractor who pulls permits in your town routinely is worth more than a slightly cheaper one who asks you to pull it yourself.
Keeping Water Out of the Well
An egress window is a deliberate hole in the part of your house that holds back soil. Built right, it stays dry for decades. Built as an afterthought, it is the most efficient water delivery system a basement can have.
- Drain the well. A drain at the bottom, carried to daylight, the perimeter drain, or a sump, over a bed of clean stone rather than compacted soil.
- Slope the grade away. Surface runoff should never be heading toward the well. Several inches of fall in the first few feet is the target.
- Move the roof water. A downspout discharging near an egress well is a predictable leak, so extensions and proper gutter and downspout work are part of the job.
- Flash and seal properly. The connection between window, frame, and foundation is where installation quality shows up.
- Cover it. A clear cover keeps rain and snow out of the well and still lets someone out of the basement.
Parts of Burlington County sit on flat lots with high seasonal water tables, where the drainage detail deserves more attention than the window brand. If your basement already takes on water, solve that first: our guide to wet basement solutions covers the order of operations.
Mistakes That Cost Homeowners Twice
- Buying the window first. The unit is selected to satisfy net clear dimensions at a specific sill height in a specific wall. Reverse that order and the window does not fit the requirement.
- Sizing the well to the window. The well has its own minimum area and projection, and one built to the window alone fails.
- Treating the opening as carpentry. Cutting a foundation wall without a proper lintel or header shows up later as cracking above the opening.
- Skipping the drain. The single most common cause of a leaking egress well, and the hardest to fix once the yard is restored.
- Framing first, egress later. It doubles the demolition.
- Calling a basement room a bedroom without egress. It is a safety issue long before it is a resale issue.
About Altieri & Sons Construction
Altieri & Sons Construction is a family-owned remodeling and construction contractor headquartered in Doylestown, serving Burlington County and Marlton along with Camden, Gloucester, and Atlantic counties in New Jersey and Bucks, Montgomery, and Chester counties and Philadelphia in Pennsylvania. We handle basement finishing, windows and doors, concrete, and the full range of interior and exterior services. Request a free estimate or call 215-416-8783.
Get Egress Right the First Time
Altieri & Sons Construction is a family-owned contractor headquartered in Doylestown, serving Burlington County and the surrounding area since 1976. Licensed, insured, and committed to quality.
Frequently Asked Questions
Do I need an egress window to finish a basement in Burlington County NJ?
If any part of the finished basement will be used as a bedroom, an emergency escape and rescue opening is required, and a small existing hopper window almost never satisfies it. If the basement is finished as living space with no sleeping room, the requirement depends on how your township's construction office reads the code edition it enforces, since some jurisdictions treat any habitable basement as needing a second means of escape. The safe sequence is to sketch your layout, take it to the local construction office with your permit application, and get the egress question answered in writing before framing starts rather than at the rough inspection.
What size does a basement egress window have to be?
Under the International Residential Code that New Jersey builds on, an emergency escape and rescue opening generally needs a net clear opening of 5.7 square feet, with a reduced 5.0 square foot allowance for grade-floor and below-grade openings in some code editions. Alongside the area figure there are hard minimums that trip people up: at least 24 inches of net clear height, at least 20 inches of net clear width, and a sill no more than 44 inches above the finished floor. Net clear means the actual hole a person can pass through with the sash open, not the rough opening or the frame size on the sticker, which is why a window that looks big enough on paper often is not. Confirm the exact figures against the code edition your township enforces.
How much does a basement egress window cost in South Jersey?
As a planning range rather than a quote, a complete below-grade egress installation in South Jersey commonly lands somewhere in the low-to-mid four figures, and more involved jobs run higher. What moves the number is the foundation: cutting a new opening in poured concrete costs more than cutting block, a deeper well needs more excavation and a taller well assembly with a ladder, and tying the well drain into existing drainage or a sump adds work. Restoring grade, landscaping, and interior finish work around the new opening are separate line items that get forgotten in early budgets. Get a written estimate that spells out excavation, cutting, header or lintel work, the window, the well, drainage, backfill, and interior trim.
Can an egress window be cut into a poured concrete foundation?
Yes, and it is routine work for a contractor set up to do it, but it is structural work and it is not a weekend project. The opening is saw-cut to a layout that respects the span above it, the load over the opening is carried by a properly sized lintel or header detail, and the cut has to be made without compromising the wall on either side. Poured walls and masonry block walls each have their own detailing. This is the part of the job where a permit, a drawing, and an inspection protect you, because an opening cut without regard for what sits above it is a problem that surfaces years later as cracking.
Will an egress window well leak or flood my basement?
A well that is built correctly does not, and a well that is built as an afterthought is one of the most reliable ways to introduce water into a dry basement. The well needs a drain at the bottom carried to daylight, to the perimeter drain, or to a sump, a stone bed rather than compacted soil underfoot, and grade around it that slopes away so surface runoff never heads for the opening. A clear cover keeps out leaves, snow, and rain while still allowing escape from inside. In parts of Burlington County with high water tables and flat lots, the drainage detail matters more than the window itself.
Does an egress window add value to a house?
It does two things that matter at resale. It is what allows a finished basement bedroom to be described honestly as a bedroom, which changes how the space is presented and appraised, and it brings daylight into a level of the house that usually has almost none. It is also the difference between a finished basement that passes inspection and one that has to be explained to a buyer's inspector. Of the money spent finishing a basement, the egress opening is among the least visible and most defensible parts of the budget.
