How Big Does An Egress Window Well Need To Be

How to Plan Egress Windows

Updated: February. 12, 2020

When burn pounces, do you lot take a way out?

Family unit Handyman

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

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Egress window logic and the building code

The onetime saying "Always leave yourself an out" is especially truthful 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 expressionless-end bedroom, windows that are large enough for you to escape—and for firefighters to enter—become essential lifesaving equipment. These earth-shaking escape hatches are chosen egress windows.

The purpose of this commodity is threefold:

1. To inform you lot why and where you need egress windows and how large they should be.
2. To alarm you to the fact that, by today'due south standards, your bedrooms and basement may very well not have proper-sized egress windows.
3. To help you choose the correct egress windows and their placement every bit you lot build and remodel.

Y'all may have installed smoke detectors, simply if you haven't provided a way out once they blare, you've merely washed half the job. This is peculiarly true for upstairs bedrooms and basements, where the stairway is frequently the sole escape route. If that stairway is blocked, you can exist trapped.

According to the International Building Code, "Basements and sleeping rooms below the fourth story shall take at least i outside emergency escape and rescue opening. . . . Such opening shall open directly into a public street, alley, yard or court." This "escape and rescue opening" can be a bedroom window, skylight or patio door, merely it must run into certain criteria:

• It must take a minimum net clear opening of 5.7 sq. ft. Internet clear opening refers to the actual free and clear space that exists when the window is open. It is not the rough opening size or the drinking glass console size or whatsoever other size, but the actual opening a person can crawl through. Code officials want the opening large enough and so firefighters can comfortably clamber through the window in total protective gear with an air tank on their back. Ground-floor bedroom windows only need a net clear opening of 5 sq. ft.; they can exist smaller because a rescue ladder doesn't take upward part of the opening.
• The opening height must be at least 24 in., and the opening width must exist at to the lowest degree xx in.
• The bottom of the articulate opening must be inside 44 in. of the floor.
• The window or other opening must be operational from the inside without keys or tools. Bars, grilles and grates over windows must exist operational without tools or keys and still allow the minimum clear opening.

Note that a window opening that's the bare minimum of 24 in. high and 20 in. wide does not run across egress requirements, since its net articulate opening is just three.33 sq. ft. A window has to be taller and/or wider than these minimums to meet the 5.7-sq.-ft.-opening requirement.

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

Figure A: Basic Egress Window Requirements

Few of us recall of bedroom windows equally lifesaving equipment— but they are! When y'all need to escape a house fire or other disaster, or when rescue personnel need to enter—the right size egress window tin can make the difference between life and death. Note: You lot can download Figure A and enlarge it in the Boosted Information section below.

Older homes may not have egress windows

Codes require new homes to accept the proper size basement and bedroom egress windows. Only if you live in an older, "pre-owned" home, open up your bedroom windows fully, pull out a record measure and run into if the opening meets electric current egress requirements. Multiply the width past the height of the opening to determine whether it'south the required five.seven sq. ft., or 821 sq. in.

Some older homes were built before at that place were any egress window requirements. Many more homes were built when the egress window net free opening size was a mere 4.3 sq. ft. Yet even newer homes often lack proper egress windows. Attics and basements were ofttimes legally remodeled into family unit rooms or offices (which didn't require egress windows) then later converted into bedrooms (which at present practice require them). When bedrooms are added to basements without the knowledge of inspectors and without the requisite egress window, they create a unsafe clandestine fire trap. During remodeling, homeowners oftentimes unwittingly supplant large egress windows with smaller, non-egress windows. And while most inspectors will need 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 only besides difficult to monitor every situation.

Required or non, egress windows are crucial lifesaving equipment. If a room has even the remote possibility of later becoming a bedroom, include an egress size window.

Extra challenges for basements

Basement egress windows present an added challenge. Besides the acme, width and overall square-footage requirements that the chamber window must meet, there are certain requirements for the window well surrounding the window.

Window wells must:

• • Let the rescue window opening to be fully opened.
  • Provide 9 sq. ft. of "floor 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 project no less than 3 in. from the window well. Information technology tin't be obstructed by the open up window or encroach 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 can create steps forth i side, eliminating the need for a ladder.

We're not washed nonetheless. If an egress window is located nether a deck or porch, inspectors and firefighters want 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 than than 44 in. from the basement flooring, some inspectors will allow you to make up the difference with a permanently attached pace.

This sounds like a lot of rigmarole and it is. Installing basement egress windows is challenging. You need to excavate a large hole, cut through and remove concrete, install a large window and window well, keep the basement walls watertight and somehow make the entire thing look skillful when you're finished. It'south a huge project—but ask the family whose flaming television set blocked their exit from the basement; they'll tell you how glad they were to have had an egress window.

Figure B: Basement egress Window size Requirements

Basement egress windows and the window well both take to run across rigorous requirements that allow occupants to escape and rescue personnel to enter. Annotation: Yous can download Effigy B and enlarge it in the Additional Data section below for a total view of standard basement window size.

How to choose an egress window size

Figure C: Minimum size casement egress window

Casement windows—with hinged sashes that swing free and articulate of the opening—can be relatively small and still meet egress requirements. This makes them ideal for basement egress and for other areas where space is limited. The overall size of this "smallest" egress casement window is 8 sq. ft.

Effigy D: Minimum size double-hung egress window

Double-hung windows—with vertically sliding sashes that always fill more than one-half the opening surface area—have to be pretty large to run across egress requirements. The overall size of this "smallest" double-hung egress window is 14.85 sq. ft., almost twice the area of the egress casement window shown.

Effigy Eastward: Minimum size gliding egress window

Gliding windows— with horizontally sliding sashes that ever fill half the possible window opening area— also take to be big to come across egress requirements. The overall size of this "smallest" gliding egress window is fifteen.five sq. ft., almost twice the area of the egress casement window shown.

Effigy F: Minimum size awning egress window

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

When it comes to egress, not all bedroom windows are created equal. Figures C – F show how any style window tin meet egress requirements—some just practise it more space efficiently than others. As you remodel, you lot'll want new egress windows that match the style of the existing windows and meet egress requirements. This can be a challenge. Conduct in mind these pros and cons.

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

Double-hung windows: Even when information technology'south fully open up, more than one-half of a double-hung window'southward overall area is blocked past glass. This ways that to meet egress window height requirements, a sleeping accommodation window must be nearly 4 ft. ix in. in overall elevation. This top requirement takes it out of the running for near basement egress situations.

Gliding windows: To meet egress requirements, these horizontally sliding windows must be at least iv ft. wide and iv ft. high. This extra glass surface area and the light it lets in are pretty darn squeamish in a basement area, if you have the space.

Awning windows: These superlative-hinged windows brand lousy egress windows. They don't meet egress requirements in basements considering the opened sash impedes entrance and go out. And those with centre opening mechanisms don't meet lawmaking because the hardware gets in the way. Only those with special hardware volition see egress requirements—and there aren't many available.

Sure skylights see egress requirements as long as they're installed within 44 in. of the floor.

If you're replacing a smaller window with a larger one that meets egress requirements, acquit in heed that enlarging the superlative 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 oftentimes but a matter of lowering the height of the sill below the window.

Additional Information

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

Originally Published: June 24, 2019

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