A note about interior doors
Pre-hung interior door: door already mounted in a frame and fitted with hinges and a hole for the handle. Quick and easy to install in the opening.
Pre-machined door frame: Quick way to hang a new door. The frame is already cut and ready to be installed in the opening. The hinges and door stop moulding are usually already mounted. Offers greater flexibility when selecting a door.
Build a door jamb: While it is relatively simple to build a door jamb, and this allows you to custom-fit it to the opening, its construction does require a little more precision.
Door: Interior door slabs (the door without the frame) come in different widths between 24" and 36". Typically, 30" doors are used for every room in the house except the door leading to the basement, which should be 32" wide (or greater), space permitting.
A 30" door mean the width of the door slab itself. The frame adds an additional 2" in width and 1" height. Standard doors are 80" high. You must allow a clearance of ½" between the bottom of the door and the floor.
Hinges: Both the number of hinges used and their size depends on the type of door and how thick it is.
- Hollow core interior doors: two hinges
- Solid-core doors: at least three hinges
The top hinge should be placed 7" from the top of the door, while the bottom hinge should be 11" up from the bottom.
Floor allowances: Both jamb sides can be adjusted from 3/8" to 1" above the floor depending on the floor covering that will be installed.
Read our interior doors buying guide for more information.