What is the average bedroom size for kids? Kids with a twin-sized bed have an average bedroom size of 10′ x 10′. Kids with a full-sized bed or bunk beds may need a slightly larger bedroom to allow for more walking room.Click to see full answer. Accordingly, what is the size of an average bedroom?We determined that the average standard size bedroom in the United States is 11 feet by 12 feet (132 square feet) and is large enough to accommodate a queen size bed. The average size of a master bedroom was much larger, measuring 14 feet by 16 feet. what is the minimum size for a bedroom? Among the things the IRC does stipulate, in its definition of a bedroom: Typically, the room must be of a minimum size—70 square feet. The ceiling height from the floor must meet building code. Most municipalities agree that the ceiling height must be at least 7 feet, but that requirement can vary. is a 10×10 room small? Newer houses more often had the tiny bedrooms (10×10 or smaller). Older ones, even with overall smaller square footages, tended to have bigger bedrooms. So you would consider 10×10 to be a small bedroom size at best? 10×10 is pretty small.How big is a 10×12 room?A 10 x 10 room has 100 square feet.