Egress just means a safe way out. An egress window is the one a firefighter can get in through and a person can get out through, without a ladder inside the room and without a key — and the building code asks for one in every sleeping room, and in any basement you have turned into living space.
It is the least glamorous thing a window does and the only one that is not optional. Plenty of houses in this region were built before the rule tightened, and plenty more failed it the moment somebody put a bedroom in the basement. Most people find out at a permit inspection, or when they come to sell.
These are the model-code figures — the ones New Jersey and New York State build on. Every one of them applies to the CLEAR opening you actually get when the window is wide open, not to the size of the unit you bought.
A window with a 20 in × 24 in clear opening hits both minimums and gives you 3.3 sq ft — well under the 5.7 sq ft the code wants. The height and width are floors, not a recipe. To reach 5.7 sq ft you have to be generous on at least one of them, which is why an egress unit is usually noticeably bigger than the window it replaces.
The question is never the style on its own — it is how much of the opening the sash gives back when it moves.
The sash swings completely clear of the opening, so almost the whole frame counts toward the 5.7 sq ft. That is why a casement can meet the requirement in a physically smaller hole than any other type, which matters most in a basement wall you would rather not cut twice.
Only one sash moves, so you get roughly half the frame at best, and the 24 in minimum height applies to that half. A double-hung can absolutely be an egress window; it just has to be a large one, and a lot of the original units in older bedrooms are not.
One panel slides behind the other, so again you are working with about half the frame — this time against the 20 in minimum width. Wide units qualify comfortably; narrow ones do not.
A picture window does not open at all, so it can never be an escape opening. An awning hinges at the top and swings out into the space you would be climbing through, and in the sizes people use them at, it will not give you the clear opening either.
If the opening is below ground, the code wants a window well outside it that you can actually stand up and climb out in: at least 9 sq ft, and at least 36 in measured out from the wall and across it. If that well is deeper than 44 in, it needs a permanently fixed ladder or steps — which may encroach a little into the well, and that is allowed.
This is the part that turns a window job into a bigger job. Making a small basement window into a legal escape opening usually means enlarging the hole in a masonry or concrete wall, and digging, lining and draining a well outside it. That is structural and excavation work sitting either side of the window itself.
New Jersey builds to the Uniform Construction Code, which adopts the International Residential Code with state amendments. New York State has its own Residential Code built on the same model. Across both, the figures above are the ones you will meet.
New York City is the exception, and it is a real one: the city is not on the IRC at all. It has its own Building Code, and a bedroom or a cellar conversion in the five boroughs has to be checked against that, not against the numbers on this page.
Editions change, towns amend, and the building department that issues your permit has the last word. Treat everything here as what to expect, not as what you have been granted.
At the free in-home consultation we measure the clear opening you have now, not just the frame, and tell you plainly whether it reaches the numbers above and what size of unit would. Where an opening is close, that is often a straightforward swap to a casement. Where it is not close, you are looking at a larger opening, and we will say so rather than sell you a window that fits the hole and fails the inspection.
Enlarging a masonry opening and building a window well is excavation and structural work alongside the window. Tell us what you are trying to do at the visit and we will be straight with you about what is ours to do and what needs another trade.
And the honest limit: we do not sign off on compliance and neither does the manufacturer. The inspector does. What we can do is make sure the opening you are paying for is measured against the right numbers before anything is ordered.
A clear opening big enough to climb through — the model code asks for 5.7 square feet, at least 24 inches high and 20 inches wide, with the bottom of the opening no more than 44 inches above the floor, opening from inside without a key or tools. It is the opening that has to meet those figures, not the window frame.
No, and this is the most common misunderstanding. A 20 by 24 inch opening meets both minimums and still gives only 3.3 square feet, well short of 5.7. The height and width are floors; the area has to be reached on top of them.
Every sleeping room, and a basement containing habitable space. That is why finishing a basement into a bedroom or a den so often brings the requirement up at permit time.
Usually yes. A casement sash swings clear of the opening, so nearly the whole frame counts toward the area. A double-hung gives back only the half that moves, so it has to be a physically larger window to reach the same clear opening.
If the opening is below ground, yes — the model code asks for a well of at least 9 square feet, at least 36 inches measured out from the wall and across it, with a permanently fixed ladder or steps where the well is deeper than 44 inches.
No. New Jersey and New York State build on the International Residential Code; New York City has its own Building Code and is not on the IRC. A bedroom or cellar conversion in the five boroughs has to be checked against the city code rather than the figures on this page.
We can measure your clear openings against the figures the code asks for and tell you plainly where each one stands, and we do that at the free in-home consultation. Compliance itself is the building department’s call, not ours and not the manufacturer’s.
No deposit · No pressure
Most people have never measured a clear opening, and there is no reason they should have. We will measure every one of them at the free consultation and tell you where you stand — including the rooms where the answer is that nothing needs doing.
No obligation. No high-pressure sales. Just expert design advice.
