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There is not a minimum measurement requirement for a size of a room for it to be considered a bedroom. A room can be considered a bedroom if it has a closet.
There is no minimum bedroom size in Washington state. However, in order to be considered a bedroom, the room must have heat, a window large enough to escape through if you had to, and a closet.
The minimum size of a standard South African bedroom is 4000x2500
less than 70 square feet
10 by 10
There is no physical minimum door size - custom doors can be made to any size. There might be building codes for your area specifying what the minimum door size is for a commercial or residential structure, though...
Two bedrooms
A so called 'average bedroom' is so variable that it is impossible to give a definitive answer. You would need to take the dimensions from ten or more estate agents 'for sale' bedroom dimensions, and then average the results.
The min size of a bedroom is 70 square feet with no dimension less than 7 feet, so a 10 x 7 would be the smallest size. If the ceiling is sloped it may have to bigger.
Standard interior doors are 3'x 6'8" Well actually there is no standard interior door size. Building code requires the minimum size to be 24" on interior passage doors. That really not wide enough though. Most bedroom doors are 30" wide. Unless you will need handicap accessible doors, then you should use all 36" wide doors. Doors will come in 2" increments usually starting at 24" and ending at 36" wide. Standard height is 6'-8" tall. However, in homes with tall ceilings 8' tall doors are quite often used.
The ideal bedroom size will vary from person to person, depending on their needs.
A king size bed is recommended for a master bedroom.