How To Build A Murphy Bed Or Wall Bed From Scratch. There are three basic requirements to consider before buying or building a murphy bed. First, you need at least 4 ft. of open wall space for a twin bed and more for a larger bed or if you intend to connect a bookcase. Murphy Beds are a great option for people looking to make the most of a home that has limited space. It is a bed that can fold up vertically or fold across horizontally into a cabinet when it is not in use. Many of our competitor’s Murphy Beds come in a lot of pieces and parts, making installation very time consuming and labor intensive. Our unique construction and simple assembly hardware makes installing your new murphy bed safe and simple. Except for the husband and the garage that could be our murphy bed building project. I love having the bed in our only extra room. It takes up a whole 9 sq ft but is ready when company needs a soft place to land for a night or two. This week I set out to ditch our box-springs and get low! Read more to find out how to build a king sized platform bed from scratch! .