Ask This Old House general contractor Tom Silva shows a homeowner the proper way to install a prehung interior door for a closet. (See below for a shopping list, tools, and steps.)
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Shopping List for How to Install a PreHung Interior Door:
Prehung interior door [https://amzn.to/2LO9kbt]
Shims [https://amzn.to/2w6ypUm]

Tools for How to Install a PreHung Interior Door:
Level [https://amzn.to/2JMPAlV]
Nail gun [https://amzn.to/2HxNQds] or hammer [https://amzn.to/2HxNQds]
Measuring tape [https://amzn.to/2WNrHOV]
Circular saw [https://amzn.to/30r3foG]
Drill/driver [https://amzn.to/2VvOsp8]

Steps for How to Install a PreHung Interior Door:
1. Use a level to find a level spot on the rough opening. Mark spots on both sides of opening with a pencil.
2. Measure down to the floor on the hinge side using measuring tape, and note the measurement.
3. Measure down to the floor on the striker side, and note the measurement.
4. Hook the measuring tape on the bottom of the door on the hinge side, then measure and mark the height noted earlier.
5. Measure from your mark to the top of the header, then measure that same distance on the striker side to ensure the header will be level.
6. Hook the measuring tape under the strikerside jamb and measure up. The difference between the measurement from the rough opening to the mark on the doorjamb is the amount that will need to be cut out of the jamb (depending on the door, one or both jambs may need to be cut).
7. Use a circular saw to cut the jamb(s) to the desired lengths.
8. Use a level to ensure the rough opening is plumb on the hinge side. If not, nail an appropriate number of shims into the rough opening to make it plumb.
9. Move the door in place and keep it flush with the outer wall.
10. Predrill a hole and drive in a screw at the top on the hinge side.
11. Check the jamb to see if it’s plumb using a level.
12. Finish screwing in the hingeside jamb using a driver.
13. Line up the two reference lines on the strikerside jamb.
14. Use shims down the hingeside jamb to level it off, and drive in screws with a driver.
15. Break off the shims.
16. Put on trim using a nail gun or hammer.
17. Install doorknob hardware.

About Ask This Old House TV:
Homeowners have a virtual truckload of questions for us on smaller projects, and we're ready to answer. Ask This Old House solves the steady stream of home improvement problems faced by our viewers—and we make house calls! Ask This Old House features some familiar faces from This Old House, including Kevin O'Connor, general contractor Tom Silva, plumbing and heating expert Richard Trethewey, and landscape contractor Roger Cook.

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How to Install a PreHung Interior Door | Ask This Old House
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