What Is the Rough Opening for a Prehung Door

A 36” x 80” pre-hung single door will use a rough opening of approximately 38-1/2” x 82-1/4” to fit. Always remember to square up your door before you nail the frame in place to assure it will close properly.

What is the rough opening for a 30 inch Prehung door?

So, if you have a bedroom door that is 30″ wide (which is considered a 2/6 or 2′-6″ door) just add 2″ to the width and frame it 32″ wide. The height is 80″ (which is considered 6/8 or 6′-8″) add 2-1/2″ to the actual door height and frame it 82-1/2″ high.

How much space do you need around a Prehung door?

Most pre-hung doors come with a 1/8-inch gap between the door and the frame on the hinge side and the top. You’ll discover it’s fairly easy to attain this gap around the entire door.