The Housing Improvement Regulations 1947 set out the minimum standards for a bedroom as follows:
- Every bedroom shall have a minimum width of 1.8 metres.
- Every bedroom shall have an area of not less than 6 square metres in an existing house (as at 1975), or 2.4 metres in a new house.
- In computing the area of a bedroom, any part of the room with a finished floor to finished ceiling height of less than 1.5 metres shall be excluded.
- There must be at least one window situated in an external wall to admit adequate light.
- The aggregate area of glass in the windows shall not be less than one-tenth of the floor area of the room.
- Windows with an area of not less than one-twentieth of the floor area must be able to be opened to allow air circulation, or in accordance with the local authority requirements.
This is useful for determining whether a small room can genuinely be marketed as a bedroom or not.
You can access the Housing Improvement Regulations 1947 at