The majority of bed frames fall into the category of raised bed frame because the mattress and box spring are raised off the floor. This is done to help prevent bed bug infestations and damage from dirt to the mattress. Some frames are raised higher off the ground than others to accommodate specific needs or to fit a certain aesthetic, so you will need to decide how high of a raised bed frame you will want for your bed. The mattress should not be raised so high that it becomes difficult to get in and out of the bed, nor should it be so low that storage options beneath the bed are eliminated.
The most basic raised bed frame will consist of metal arms that interconnect; these arms will be raised off the ground by either casters on supports, or sliders on supports. Such frames are designed for use with both a mattress and a box spring; otherwise, the frame will not be able to keep the mattress flat and straight. Such frames are usually the least expensive option, and they are quick and easy to assemble, but they are not especially attractive. A bed skirt is usually used to hide the frame in this situation.
If you are looking for a more attractive option, you may be able to find a raised bed frame in the platform style. This type of frame is meant for use only with a mattress. The frame itself is flat and straight, and it is able to adequately support the mattress. This can also maximize the amount of storage space beneath the mattress, as well as headroom above it.
Loft beds are raised exceptionally high off the ground, much like a bunk bed. Some raised bed frame options in this category will feature two mattresses: one at the normal height, and then one above that to accommodate more sleepers. If storage is a concern, some models can be purchased without the bottom mattress and frame. A desk, drawers, or other storage units can easily be placed beneath the mattress to maximize storage space.
Bed risers can also be used to elevate a normal frame off the ground even further. These blocks will be placed underneath the frame's casters or legs, thereby raising the frame up evenly on all sides. This is an inexpensive option for creating more storage space under a bed, but again, this may or may not be the most attractive option.