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If you live in a small house, you can increase your floor space by removing a stairway that goes to a seldom-used area, such as a crawl space or a basement. By replacing a stairway with a trap door, you can maintain access to the area, but gain more useful space in your home. Interior Floor, Interior Design, Trap Door, Secret Storage, Crawlspace, Floor Space, Stairways, Gain, Basement
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How to Build an Interior Floor Trap Door | Hunker

To install a trap door in a floor to access a crawl space or secret storage area, you cut the door, frame the opening, affix the cutout to hinges, and attach a door pull.