before you pick your new pre-hung door, it"s vital you recognize the size of the opening. Acquiring the appropriate size door because that the opening helps to make your installation smooth and also will remove having problems down the road.

You are watching: Rough opening for a 36 inch door

Pre-Hung Door Measurements

Measure the opening to her door frame. Be certain to permit for around a 1½ inch larger opening than the traditional door sizes. Frequently a pre-hung door is measure up in 30-inch and also 36-inch sizes with additional sizes available in non-standard widths.


The doors are also a traditional 80 customs tall. Presuming the door is a 36-inch large door, the dimensions of her opening must be 37½ inch vast by 81½ customs tall.

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Reasons for Door opened Sizing

When a pre-hung door is being mounted into an opened there have to be considerations because that leveling the door, and ensuring that it has actually an obstruction complimentary swing. If the pre-hung door is butted up right into an opening, the swing will be hindered through the door. It may scrape the floor or the may get stuck as it is closing.

An opening that is the very same size together the framework on the pre-hung door can transform the shape of the frame and also make the installation an ext difficult.

Taking the guesswork out of selecting the correct size pre-hung door makes things much easier. Currently that you have actually the know-how, you"re all collection to head to the hardware store.

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