Note: You can find lightweight closet doors like the ones we installed at home improvement centers or hardware stores.Steps:
1 Remove the old door. Pop the door rollers off the track, unscrew the track from the header and remove it.
2. Using a pry-bar or claw hammer, pull all the trim and casing off the old door opening (figures A and B).
3. Frame in the new opening. For this closet, measuring from the outside of the existing opening, we measured in 31 inches from each side, and nailed in a 2x4 uprights (figures C and D) making sure they are plumb (vertically level).
4. The space between the 2x4's is filled in with drywall. Once you've made sure there is a 31 inch opening for each door, measure the space between the new door openings and cut a piece of drywall to fit.
Tip: Drywall is easy to cut. Begin by scoring through the paper covering with a utility knife.
5. Screw the drywall to the 2x4s on the inside, and install another piece on the outside.
6. Prime and paint the drywall.
7. Install the doors by nailing the doorframe (on the hinge side) to the framing, then make sure the doorframe is plumb (figure E). Next, make sure the top is level, then work down the latch side, making sure to keep it level.
Tip: Use carpenter's shims to keep everything tight.
8. Install the casing and trim using a finish nailer.
9. Prime and paint the doors and trim.