Storage space, always a good thing, becomes even better when hidden. One way to do this is to build an access door into an area of the house that would otherwise be inaccessible. A dormer or false walls are examples of hide-able storage areas. Access doors also can be used to gain access to bathroom plumbing.
useful stairs. can have tambour doors covering the shelves (to hide clutter without getting in the way) and cover steps with underlay and soft carpet. add a handrail. perfect design for a tiny home. easy DIY.