Exterior Door Rough Opening Size Chart

Framing rough opening sizes are really quite simple.

Exterior door rough opening size chart.

Getting the rough opening size right the first time will save you from frustration when installing your doors. 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. You can also order a custom size pre hung door. You should add 2 1 2 to the height of the actual door.

This takes into account the thickness of a standard 3 4 inch doorjamb on each side. Keep this in mind. Of frame is 40 x 86 as the frame face is 2 around all 3 sides. Therefore the rough opening would be 82 1 2 tall by 38 1 2 wide.

Use shims and or caulk to seal gaps between wall and frame. 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. For the 36 x 80 exterior doors this rough opening will need to be 38 inches by 82 1 8 inches. For example let s say we want to frame a 6 8 x 3 0 front entry door.

The 6 8 stands for 6 8 tall and the 3 0 stands for 3 0 wide. Add 2 to 2 1 2 inch to the measurement of the door s width to determine the total width of the rough opening. This will give you room to space the door frame off of the sub floor. These doors should be installed by a knowledgeable pro because the rough in opening in the wall will have to be enlarged.

If you re going to frame a rough opening for a door then you ll need to know the unit size.