How to Measure a Rough Opening

Measure Your Entryway - for Prehung Units Only

  • To ensure accurate measurements, first remove the interior casing on the sides and top of your single or double door to reveal rough opening frame.
  • Measure from inside the face of one stud to inside the face of the other stud and write down the measurement.
  • Measure from the subfloor (plywood or concrete) to the bottom of the header above the door and write down the measurement.
    Measurement B:_________ Measurement C:__________

 ConfigurationActual SizeRough Opening
6/8Single 3/0 DoorDoor:
3/0 x 6/8 =35-3/4” X 79-1/4”
3/6 x 6/8 =41-3/4” X 79-1/4”

Sidelite:
1/0 x 6/8 = 11-7/8” x 79-1/4”
1/2 x 6/8 = 13-7/8” x 79-1/4”
38-3/8” X 82-1/2”
Single 3/6 Door44-3/8” X 82-1/2”
Single 3/0
One 12” sidelite
51-7/8” X 82-1/2”
Single 3/0
One 14” sidelite
53-7/8” X 82-1/2”
Single 3/0
Two 12” sidelites
65-3/8” X 82-1/2”
Single 3/0 
Two 14” sidelites
69-3/8” X 82-1/2”
Double 3/0 Door74- 7/8” X 82-1/2”
    
7/0Single 3/0 DoorDoor:
3/0 x 7/0 =35-3/4” X 83-1/4”
3/6 x 7/0 =41-3/4” X 83-1/4”

Sidelite:
1/0 x 7/0 = 11-7/8” x 83-1/4”
1/2 x 7/0 = 13-7/8” x 83-1/4”
38-3/8” X 86-1/2”
Single 3/6 Door44-3/8” X 86-1/2”
Single 3/0
One 12” sidelite
51-7/8” X 86-1/2”
Single 3/0 
One 14” sidelite
53-7/8” X 86-1/2”
Single 3/0 
Two 12” sidelites
65-3/8” X 86-1/2”
Single 3/0 
Two 14” sidelites
69-3/8” X 86-1/2”
Double 3/0 Door74- 7/8” X 86-1/2”
    
8/0Single 3/0 DoorDoor:
3/0 x 8/0=35-3/4” X 95-1/4”
3/6 x 8/08 =41-3/4” X 95-1/4”

Sidelite:
1/0 x 8/0 = 11-7/8” x 95-1/4”
1/2 x 8/0 = 13-7/8” x 95-1/4”
38-3/8” X 98-1/2”
Single 3/6 Door44-3/8” X 98-1/2”
Single 3/0 
One 12” sidelite
51-7/8” X 98-1/2”
Single 3/0 
One 14” sidelite
53-7/8” X 98-1/2”
Single 3/0 
Two 12” sidelites
65-3/8” X 98-1/2”
Single 3/0
Two 14” sidelites
69-3/8” X 98-1/2”
Double 3/0 Door74- 7/8” X 98-1/2”