Required sizes for basement bedroom window in Ontario

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Posted by: from Mississauga
3/29/2017 at 5:24:17 PM

According to OBC what are the min required sizes for basement bedroom window and can you explain with a picture?


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Date/Time3/29/2017 at 6:54:52 PM

When opened must be 3.9 sq.ft and no less then 18" in any direction.

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Victoria Zamchevska Designs in Ottawa
Date/Time3/29/2017 at 7:12:04 PM

Hi Sam,

You only need one for the level that contains a bedroom but doesn't have an exit leading directly to the outside.

You can see the size requirements here:

Good luck,


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Date/Time3/30/2017 at 8:43:03 PM

For bedrooms, provide an unobstructed opening of NOT less than 0.35 m (3.8ft ) in area with no dimension less than 380 mm (15 ).

This window shall be openable from the inside without the use of tools or special knowledge. Normally, only slider and casement type windows meet this requirement.

Required sizes for basement bedroom window in Ontario
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Donny in Chatham
Date/Time10/19/2017 at 10:32:19 AM

Two Parts.

1) OBC - minimum window glass area for a bedroom is 5%.

i.e. Area of bedroom is 120 sqft; therefore the glazed area of the window is 6 sqft

2) OBC - an egress window can be placed in the bedroom or any other location in the basement; minimum area of unobstructed opening not less than 3.8 ft (0.35 m ) with no dimension less than 15" (380 mm) (3.9 ft ). This will also depend on what kind of window you are using ie. casement, slider, or awning.

If you have an egress window located in the basement level but not in the bedroom then Part 1 applies. If you want to place a egress window in the bedroom then part 1 and 2 apply.

Hope this makes sense.

Required sizes for basement bedroom window in Ontario

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