Wallbed Factory fabricates Murphy beds with built-in box springs. Our bed cabinets have an internal framing that allows us to create a solid wood frame to support the mattress. There is no need for a box spring mattress. This also means that you do not have to worry about sag in your mattress or having an uncomfortable bar pressing into your back. Our technology allows you to use most any mattress that is up to 10” thick in your Murphy bed. That means you do not have to pay extra for a specialized mattress! You can feel assured that your guests, or yourself, will be sleeping in comfort.