Bed frames are available at almost every home design shop, but often they are one of the most expensive things you can purchase for your home design and comfort. Bed frame supplies are cheaper. Building a frame is relatively simple if you know how to measure, saw and screw. Before making your bed frame, measure the room so that the size of the frame does not overwhelm the balance of the room. If you already have a mattress, make sure to make the bed frame the proper size to accommodate it.