Basement Egress Window Code in New York: The Numbers That Matter
New York requires every sleeping room, including basement bedrooms, to have an emergency escape opening with at least 5.7 square feet of net clear opening, a minimum 24 inch opening height, a minimum 20 inch opening width, and a sill no more than 44 inches above the finished floor.
If you are finishing a basement and putting a bedroom in it, this is the requirement that decides whether the room is legal. It is also the requirement most often failed, because the numbers are easy to misread and the mistake is expensive to correct after the concrete is cut.
Here are the actual figures and the specific ways people get them wrong.
The required dimensions
| Requirement | Minimum | Notes |
|---|---|---|
| Net clear opening area | 5.7 square feet | The actual hole, fully open |
| Net clear opening height | 24 inches | Measured on the clear opening |
| Net clear opening width | 20 inches | Measured on the clear opening |
| Sill height above floor | 44 inches maximum | Finished floor to the bottom of the clear opening |
| Window well horizontal area | 9 square feet | Where a well is required |
| Window well projection | 36 inches minimum | From the foundation wall |
| Ladder required when well depth exceeds | 44 inches | Permanently affixed |
| Opening operation | Without keys, tools or special knowledge | From the inside |
Meeting the 24 inch height and 20 inch width minimums alone does not satisfy the requirement. 24 by 20 inches is only 3.3 square feet. You still need 5.7 square feet total.
The four mistakes that fail inspection
- Measuring the rough opening or the window frame instead of the net clear opening. The clear opening is the space a person can actually pass through with the window fully open, and it is always smaller than the unit.
- Choosing a slider. A two-panel slider only opens to half its width, so it needs to be very large to reach 5.7 square feet. Casements swing fully clear and are the efficient choice.
- Setting the sill too high. Forty-four inches from the finished floor is the ceiling, and it is easy to exceed when the foundation cut is placed for convenience rather than for code.
- Installing a shallow decorative window well. Wells need a minimum projection and horizontal area, and a well deeper than forty-four inches needs a permanently attached ladder.
Why the window well is half the requirement
A window well that is not properly sized and drained fails on two counts. Functionally, it is a bathtub against your foundation, and water collecting in it will eventually find its way past the new window into the basement you just finished. For code, the well has to provide enough clear area for a person to get out and stand, which is why the minimum horizontal area and projection exist. A well over forty-four inches deep needs a permanently affixed ladder, not a stepstool. The cover has to shed snow load and still be openable from the inside, because a well packed with February snow is not an escape route.
What it costs to do properly
| Component | Typical cost | Notes |
|---|---|---|
| Permit and inspection | $150 to $600 | Varies by municipality |
| Excavation and spoil removal | $500 to $1,500 | Access affects this most |
| Saw cutting the foundation | $800 to $2,000 | Poured concrete costs more than block |
| Lintel and structural support | $200 to $600 | Sized to the opening |
| Egress-rated window | $500 to $1,200 | Casement is usually the efficient choice |
| Window well, backfill, drainage | $700 to $2,000 | Depth drives the cost |
| Cover and ladder | $200 to $700 | Ladder required over 44 inches deep |
| Interior framing and finish | $400 to $1,200 | Drywall return and trim |
| Typical total | $3,500 to $8,500 |
Ranges reflect typical Capital Region projects and are for planning only. Every Sundog quote is written, itemized, and free.
Frequently asked questions
Does my basement need an egress window?
If there is a sleeping room down there, yes. Code requires an emergency escape and rescue opening in every sleeping room. An unfinished basement or a finished basement with no bedroom does not require one under the residential code, though some municipalities require one for any habitable basement space. Confirm locally.
What size window meets the 5.7 square foot requirement?
It depends on the style, because the requirement is on the net clear opening, not the unit size. A casement swings fully clear so a relatively modest unit qualifies. A two-panel slider only opens to half its width so it needs to be much larger. Your contractor should be able to state the net clear opening figure for the specific unit being quoted.
Can a basement bedroom be listed as a bedroom without an egress window?
Generally no, and this is the practical reason most people do the work. Appraisers and buyers' inspectors check for it, and a basement room without compliant egress is typically listed as a bonus or recreation room instead of a bedroom, which affects the value of the house directly.
How long does egress window installation take?
Two to four days for the excavation, cutting, lintel, window setting, well installation and backfill, plus additional time for interior finish work and for scheduling the final inspection. Weather affects the schedule because the excavation is open during the work.
Will cutting the foundation damage my house?
Not when it is done correctly. The opening gets a properly sized lintel that carries the load above it, the same principle as a header over a door. The real risk comes from breaking the opening out with a hammer rather than saw cutting it, which fractures the surrounding concrete. Insist on saw cutting.
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