Exterior Door Rough Opening Size Chart

These doors should be installed by a knowledgeable pro because the rough in opening in the wall will have to be enlarged.

Exterior door rough opening size chart.

You should add 2 1 2 to the height of the actual door. This will give you room to space the door frame off of the sub floor. This takes into account the thickness of a standard 3 4 inch doorjamb on each side. Therefore the rough opening would be 82 1 2 tall by 38 1 2 wide.

The rough opening size is the construction size with the side lumber studs and header. Framing rough opening sizes are really quite simple. Keep this in mind. If you re going to frame a rough opening for a door then you ll need to know the unit size.

You can also order a custom size pre hung door. Getting the rough opening size right the first time will save you from frustration when installing your doors. Just add 2 to the width of the actual door size. For example let s say we want to frame a 6 8 x 3 0 front entry door.

As you can see the standard exterior door size rough opening is a full 2 inches wider than 36 inches and 2 1 8 inches higher than 80 inches. Frames that butt wall block or exterior wood stud a opening width 4 1 2 b opening height 2 1 4 the rough opening would be 40 1 2 x 86 1 4 for a 3 0 x 7 0 door frame. Standard door rough openings. Add 2 to 2 1 2 inch to the measurement of the door s width to determine the total width of the rough opening.

Use shims and or caulk to seal gaps between wall and frame.