Construction Budget Estimate. Residential construction costs are not that complicated unless you really want to make them that way. There are some general broad stroke pieces of information that if you know them, you will not be surprised when it comes time to planning your budget.
A full size bed is 54 inches wide and 75 inches long while queen size beds are 60 inches in width and 80 inches in length.
A double bed is the same as a full size bed and is about 74 inches by 53 inches according to these best rated double / full bed mattresses: http://www.amazon.com/s/ref=sr_nr_n_2?fs... So that's how big a double bed is. Just for comparison, a queen size bed is about 80 by 60 so roughly 6 inches longer and 7 inches wider so not too much of a big difference but for some people, it's just enough to feel like they have plenty of room.