There is no one-size-fits-all formula when it comes to cupboard design. You need to think about the space where the cupboard is to be placed—living, kitchen, dining or bedroom—the size of the room, how it needs to be in the context of the other furniture, etc. However, when it comes to wardrobe design for the bedroom, the standard size is 7 feet by 10 feet at a minimum. The depth typically is about 24 inches but if you want a compact one, it can be even as narrow as 18 or even 12 inches. If space is a real issue, then think about collapsible wardrobes.