At the hardware store I see bifold closet doors listed in sizes like 36×80, 48×80, 72×80. I'm not sure if these are nominal sizes or exactly which parts they're measuring from. How would I determine the correct size of rough opening to create for one of these standard sizes?
How to determine rough opening sizes for common closet door sizes
closetdoor-frameframing
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Best Answer
Bifold rough openings: to the hinge (pivot ) side add 3/4", to the other other side, 1/4"
So for single 24" wide door, a 25" RO (which is really a finished opening for bifolds) is needed.
You need a bit more clearance on the pivot side, because the pivot is inboard a bit and it needs clearance to swing through (pivot around) the thickness of the door. Similarly, any baseboard trim will need to be held back from the inside (of the closet) for door clearance.