Captain's beds owe their origin to the days of the ship when officers quarters were tight and space was at a premium. The bed became a place for storage by fitting the frame beneath the mattress with drawers and even cupboards. The captain's bed can come in all sizes from kids to king size. They are available various retailers today.
Brick and mortar sellers
You can buy captain's beds for the kid and adult at stores like Bunkbeds UK, which features captain's beds made from solid Brazilian pine, Baron's Beds in Kent which have beds that can be a combination of drawers and cupboards or one of each, and Marks and Spencer. The finishes of the beds can vary from white to stained, and can include a variety of configurations regarding drawers and cupboards. The beds can be twin beds, queen beds, king-size beds.
Multiple retailers offer captains beds ranging from the twin bed, queen size, full beds, and the king-size bed. The beds can be made of solid pine or press-board with wood veneer. The bed can be made in the style of a mission bed or have a combination of storage and a pull out bed. Retailers include Amazon, the Kid's Window, Archer's Sleepcenter, Comfy Living, Cabin Beds UK, and more. Many of these retailers offer next-day delivery. Some of the beds require assembly after they've been delivered while others do not. The finishes and styles of the captain's beds vary.
Custom captain's bed
If you are not happy with the captain's beds that are available, you can make a custom captain's bed for yourself or your child. These bed can be made from whatever wood you choose, or even plywood that is stained or painted to look like more expensive wood. The configuration of the storage units can be chosen by you as well as the hardware, such as drawer pulls, handles, hinges, the presence of a roll-away bed or not, or some other style details. The beds can be of any height and have any number of drawers, as well as be of any width. It can also be a combination of woods, such as pine with oak inlay.