What is an egress window?

Monday, August 20, 2018

Egress is “a way out,” and an egress window in the building code is defined as a required alternate route out of the home in an emergency, typically a fire. All sleeping rooms must have a window of adequate size opening for a person to get out and a rescue fireman with a backpack to get in. The minimum specifications in the International Residential Code (IRC) and Florida Building Code (FBC) are: 

  • Minimum width of window opening: 20 inches
  • Minimum height of window opening: 24 inches
  • Minimum square area of opening: 5.7 square feet (5.0 square feet for ground floor)
  • Maximum window sill height: 44 inches

   Windows that are egress-rated are marked as such in the manufacturer’s catalogs, and it’s worth noting that the minimum width times the minimum height does not equal the minimum required square footage of opening. One of the two dimensions has to be significantly larger than the minimum. A 20-inch wide window needs to be at least 42-inches high, for example, to be acceptable. An easier solution than doing math calculations, though, is to just stick to the manufacturer’s egress-rated windows. 

    If you have a home that was built before the egress window building code standard, when you decide to replace the bedrooms windows it is likely your local building department will require that one new window in each bedroom meet the egress window specifications.

  The egress opening of a single hung or sliding window is a little less than half of the total window area because only one side can be opened at a time. But there are also specially designed windows for replacements for smaller existing openings that have a secondary hinge point on one side and the entire window assembly opens outward when the securing latch is released from inside the bedroom.

   When discussing emergency exit routes, it’s also important to note that your primary exit route should not have any obstructions. No dual-keyed locks (key required on both sides of a deadbolt) are allowed at primary exit doors.  While it might seem safe enough to have a key hanging on a hook near the door for a double-deadbolt lock, finding that key and then getting it into the keyhole in the dark in a smoke-filled room is not something anyone should have to endure in a fire emergency. 

    Also, see our blog post Why are window security bars dangerous?

• • • • • • • • • • • • • • • • • • • • • • • • • • • • • • 

  To learn more about doors and windows, see these other blog posts:

What causes sweating (condensation) on the inside of windows in the winter? 

Is every exterior door of a house required to have a landing outside? 

 What are the small slots at the bottom of the outside of my window? 

Why does condensation form on the outside of some windows and not others in the morning? 

Why if the garage door track a white tube? 

What is the raised metal plate on the floor under the garage door?

 Why do I have to hold down the button to close the garage door? 

 Where is safety/tempered glass required for the windows of a house?

How can I tell if a window or glass door is safety glass? 

Should a front door swing in or out? 

Why is pressure washing double pane windows an expensive mistake? 

How many exit doors are required for a house?

 How many exit doors are required for a mobile/manufactured home? 

Are openable windows required to have window screens? Will windows with no screens pass a home inspection? 

Can a bedroom door open into the garage?

What are the building code requirements for a door from the garage to the house?

What is "low-E" window glass? 

What does ANSI 297.1 on glass mean?

Why is a double cylinder deadbolt lock on an exterior door a safety hazard?

How can I check my garage door to make sure it is safe?  

Does a home inspector test all the windows and doors in a home? 

How difficult is it to change a window to french doors or a sliding glass door?

How do you determine if a door is left-handed or right-handed?

Why are window security bars dangerous? 

What are the common problems you find inspecting windows?

What is causing a foggy haze on my windows? 

What do those numbers on the manufacturer's stickers in new windows mean?

What does a home inspector check on an electric garage door? 

• What is the tempered label on glass at windows and sliding glass doors called?

• Do I need to have two exterior exit doors in my house? 

• When is safety glass required for windows at stairs and stair landings?

    Visit our DOORS AND WINDOWS page for other related blog posts on this subject, or go to the INDEX for a complete listing of all our articles.

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