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How are garage doors and garage door rough openings measured?

mikeysp | Posted in General Questions on

Hi, I am in zone 4a and want to know if garage door sizes are the exact size listed. For example, is a 9ft wide x 7ft tall garage door exactly those dimensions? Also, what is the standard for rough openings? Exactt size as weather strip will subtract an inch or so, or is the opening smaller than the 9×7? I am probably going to use one 9×7 and one 12×12 in case the rules change with varying sizes. I just used the 9×7 as an example.

I have searched online quite a bit for this info, but to no avail.

Thank you for any light you can shed on this subject.


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  1. Expert Member


    Garage doors are the sizes shown on each manufacturer's spec sheet. They usually increase in one foot increments in both width and height, and a 10 ft by 8 ft door measures exactly that.

    You typically frame the rough-opening the same size as the door, and get your overlap by casing the opening with 2"x material.

    Remember to reduce the width of the top of your foundation on each side of the opening to accommodate the track, which has to be able to run right down to the slab.

    You also need to provide blocking above the door for the spring.

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