At the first step you have to looking for when you have to buy or build the platform bed. You have to know size of people who use and location in the bedroom. Actually, we have the standard size of the bed refers to dimentions of mattress. The size of the mattress vary considerably around the world, with most countries having their own standards. Check mattress sizes from store in your country or websites. It may need to fit into furniture or a certain room size.