Rough Openings | Standard Framing Dimensions

By Todd Fratzel on Framing

Framing Rough Openings

rough openings 300x300 Rough Openings | Standard Framing DimensionsFraming rough openings for windows and doors (standard door and windows openings) is really straight forward if you follow some simple dimensional rules. For standard wood framed construction the rough openings for doors and windows is typically the actual unit size plus 2-1/2 inches in height and width.

Standard Door Rough Openings

If you’re going to frame a rough opening for a door then you’ll need to know the unit size. 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. Therefore the rough opening would be 82-1/2″ tall by 38-1/2″ wide.

82-1/2 inches also happens to be the standard “header height” for windows and doors. If you’re a novice framer then this is the height of the BOTTOM of the window and door headers. This is also the top of the jack studs. Which means the jack studs are 81 inches long (typically).

Window Rough Openings Rough Openings | Standard Framing Dimensions

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10 Comments

  1. Brooks says:

    This site is very helpful for those of us who don’t do this every day. Thank you for making it available.

    • Todd says:

      Brooks – Thanks for the compliment. I hope you come back often for more advice and information.

      • Wimal Lokuliyana says:

        Thank you Todd!
        The simple way of explaining without long descriptions is appreciated. Anybody can understand easily. Very useful.
        Wimal Lokuliyana

  2. deshgaurav says:

    plz enter the standard size of door and window.

  3. dennis says:

    If i am building an addition when i stand my wall up it is 1 inch higher than the old wall can i make the cornish even by making my new rafters with a longer overhang,

  4. rick hudson says:

    Your web site says window rough opening should be 2 1/2″ over actual. The flange on window is not that large, so i respectfully suggest your info is wrong. !/2 ” to 3/4 is what I use. Did I miss something, Thanks, Rick

    • Todd says:

      Rick,

      Here’s what the article says:

      “Window rough openings are framed in a similar way to door openings. Again I like to use examples so let’s say we’ve got a 3′ wide by 4′ tall window unit then the rough opening would be 38-1/2″ wide and 50-1/2″ tall. Now, most window manufactures actually specify a standard rough opening which is typically a bit tighter so it’s best to follow the manufacturers recommendations when possible.”

      As I noted, some manufacturers use a tighter dimension. 2-1/2 inches is the industry standard, many window manufacturers adjust after framing. Framing usually happens, then windows are ordered based on rough-openings.

  5. grandpa bear says:

    will the rough opening for a double door still be the nominal dimensions + 2.5 inches in both height and width?

    • Todd says:

      Yes sir :) However, if you have certain special doors that number might change, some outswing French doors and some Andersen units are different so check the spec with the door.

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