How Big Does An Egress Window Need To Be

How to Plan Egress Windows

Updated: Feb. 12, 2020

When fire pounces, do you have a way out?

Family unit Handyman

Egress windows provide emergency exits in instance of burn down. We tell you lot how big they should be and where you lot need them in your home. If your existing windows aren't large plenty, consider remodeling to include them.

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Egress window logic and the building code

The former saying "Ever leave yourself an out" is especially true when it comes to home fires. When the basement stairs are blocked by a flaming telly (truthful story), or fire and thick, black smoke are racing down a hallway toward a dead-terminate bedroom, windows that are big plenty for you to escape—and for firefighters to enter—get essential lifesaving equipment. These all-important escape hatches are called egress windows.

The purpose of this article is threefold:

1. To inform you lot why and where y'all need egress windows and how big they should be.
2. To alert you to the fact that, by today's standards, your bedrooms and basement may very well not take proper-sized egress windows.
3. To help you choose the correct egress windows and their placement equally you build and remodel.

You may have installed fume detectors, but if you haven't provided a fashion out one time they blare, you've but done half the job. This is especially true for upstairs bedrooms and basements, where the stairway is often the sole escape route. If that stairway is blocked, you can be trapped.

According to the International Building Code, "Basements and sleeping rooms below the quaternary story shall have at to the lowest degree one exterior emergency escape and rescue opening. . . . Such opening shall open directly into a public street, alley, 1000 or court." This "escape and rescue opening" can exist a bedroom window, skylight or patio door, simply it must meet sure criteria:

• It must have a minimum net clear opening of 5.vii sq. ft. Net articulate opening refers to the actual gratis and clear infinite that exists when the window is open. It is not the crude opening size or the glass console size or any other size, just the actual opening a person can clamber through. Code officials desire the opening large enough and then firefighters tin can comfortably crawl through the window in full protective gear with an air tank on their back. Basis-floor sleeping room windows but need a cyberspace articulate opening of 5 sq. ft.; they can be smaller because a rescue ladder doesn't take up part of the opening.
• The opening summit must be at to the lowest degree 24 in., and the opening width must be at to the lowest degree 20 in.
• The bottom of the clear opening must be within 44 in. of the flooring.
• The window or other opening must be operational from the within without keys or tools. Bars, grilles and grates over windows must be operational without tools or keys and nevertheless let the minimum clear opening.

Note that a window opening that'due south the bare minimum of 24 in. loftier and 20 in. wide does not run into egress requirements, since its cyberspace clear opening is only three.33 sq. ft. A window has to be taller and/or wider than these minimums to meet the 5.vii-sq.-ft.-opening requirement.

All these numbers may seem daunting, but selecting a new egress window doesn't demand to be. Window manufacturers list the internet free opening of their windows and skylights in their catalogs, and whether they meet egress requirements.

Effigy A: Bones Egress Window Requirements

Few of us think of bedroom windows equally lifesaving equipment— only they are! When you need to escape a firm fire or other disaster, or when rescue personnel need to enter—the right size egress window tin brand the divergence between life and expiry. Notation: You can download Figure A and enlarge information technology in the Boosted Information department below.

Older homes may not have egress windows

Codes require new homes to take the proper size basement and chamber egress windows. Merely if you live in an older, "pre-owned" abode, open your bedroom windows fully, pull out a tape measure and come across if the opening meets electric current egress requirements. Multiply the width past the acme of the opening to determine whether it's the required 5.7 sq. ft., or 821 sq. in.

Some older homes were congenital before there were any egress window requirements. Many more than homes were built when the egress window net free opening size was a mere 4.3 sq. ft. Yet even newer homes frequently lack proper egress windows. Attics and basements were often legally remodeled into family rooms or offices (which didn't require egress windows) so later converted into bedrooms (which now do require them). When bedrooms are added to basements without the knowledge of inspectors and without the requisite egress window, they create a dangerous undercover burn down trap. During remodeling, homeowners frequently unwittingly supercede large egress windows with smaller, non-egress windows. And while nigh inspectors will demand egress windows be installed when bedrooms are remodeled or added on, they won't necessarily dictate that windows in existing bedrooms be enlarged to egress size; it's simply also difficult to monitor every situation.

Required or not, egress windows are crucial lifesaving equipment. If a room has even the remote possibility of later becoming a sleeping room, include an egress size window.

Extra challenges for basements

Basement egress windows nowadays an added challenge. Too the peak, width and overall foursquare-footage requirements that the bedroom window must meet, there are certain requirements for the window well surrounding the window.

Window wells must:

• • Allow the rescue window opening to exist fully opened.
  • Provide 9 sq. ft. of "floor surface area," with a minimum dimension of 36 in. in width and in length.
  • Incorporate a permanently affixed ladder or steps for climbing out if the window well depth exceeds 44 in. The ladder must be at least 12 in. wide and projection no less than 3 in. from the window well. It can't be obstructed by the open window or interlope on the required window well dimensions by more than than 6 in. If you build the window well from timbers or modular concrete blocks, you lot can create steps forth one side, eliminating the need for a ladder.

We're not washed even so. If an egress window is located under a deck or porch, inspectors and firefighters desire at least 36 in. between the top of the window well and the bottom of the deck or porch joists; they much prefer 60 in. If the bottom of your egress opening is more 44 in. from the basement floor, some inspectors volition permit you to make up the difference with a permanently fastened step.

This sounds similar a lot of rigmarole and it is. Installing basement egress windows is challenging. You need to excavate a big hole, cut through and remove physical, install a big window and window well, proceed the basement walls watertight and somehow brand the unabridged thing look adept when y'all're finished. Information technology's a huge project—but ask the family whose flaming television blocked their exit from the basement; they'll tell yous how glad they were to have had an egress window.

Effigy B: Basement egress Window size Requirements

Basement egress windows and the window well both accept to meet rigorous requirements that allow occupants to escape and rescue personnel to enter. Annotation: You can download Effigy B and overstate it in the Additional Information section below for a full view of standard basement window size.

How to cull an egress window size

Figure C: Minimum size casement egress window

Casement windows—with hinged sashes that swing free and clear of the opening—can be relatively pocket-size and notwithstanding meet egress requirements. This makes them ideal for basement egress and for other areas where infinite is express. The overall size of this "smallest" egress casement window is viii sq. ft.

Figure D: Minimum size double-hung egress window

Double-hung windows—with vertically sliding sashes that always fill more than than half the opening area—have to exist pretty big to meet egress requirements. The overall size of this "smallest" double-hung egress window is 14.85 sq. ft., about twice the expanse of the egress casement window shown.

Effigy E: Minimum size gliding egress window

Gliding windows— with horizontally sliding sashes that e'er fill half the possible window opening area— besides have to be big to meet egress requirements. The overall size of this "smallest" gliding egress window is 15.5 sq. ft., well-nigh twice the area of the egress casement window shown.

Figure F: Minimum size awning egress window

Awning windows are problematic. Since the opened sash prevents escape from most window wells, they're unsuitable for basement egress. And with about awning windows, the opening hardware and height don't meet egress requirements. Some manufacturers offer models with detachable operators that meet egress requirements.

When information technology comes to egress, not all bedroom windows are created equal. Figures C – F evidence how any style window can run into egress requirements—some but do it more space efficiently than others. Equally you remodel, you'll want new egress windows that match the fashion of the existing windows and come across egress requirements. This can be a challenge. Bear in mind these pros and cons.

Casement windows: These side-hinged windows fulfill egress requirements while taking upward the smallest amount of wall space. This makes them ideal for egress windows in basements or other areas where space is limited. Some manufacturers tin can install a special operator arm that allows the window to open wider than the standard sleeping room window size operating arm to encounter egress requirements. Others have an operator arm that can be pushed to open the window wider in an emergency. These meet egress requirements as long as you exit the "PUSH Hither" label in place.

Double-hung windows: Even when it's fully open, more than one-half of a double-hung window'south overall expanse is blocked by glass. This means that to meet egress window peak requirements, a bedroom window must be nearly 4 ft. ix in. in overall peak. This tiptop requirement takes it out of the running for most basement egress situations.

Gliding windows: To come across egress requirements, these horizontally sliding windows must exist at to the lowest degree four ft. wide and 4 ft. high. This extra drinking glass area and the light it lets in are pretty darn nice in a basement area, if you have the space.

Canopy windows: These top-hinged windows make lousy egress windows. They don't meet egress requirements in basements because the opened sash impedes entrance and exit. And those with center opening mechanisms don't run into code because the hardware gets in the mode. Only those with special hardware will meet egress requirements—and there aren't many available.

Certain skylights meet egress requirements every bit long as they're installed within 44 in. of the floor.

If y'all're replacing a smaller window with a larger one that meets egress requirements, bear in listen that enlarging the height of the opening takes less structural work than enlarging the width. Increasing width means installing a larger, beefier horizontal structural header over the window opening—a major project. Increasing height is often only a matter of lowering the tiptop of the sill below the window.

Additional Information

• Figure A: Basic egress window requirements
• Figure B: Basement egress window requirements

Originally Published: June 24, 2019

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