Definition
The definition of a mobile home gives a maximum size of 20m x 6.7m (66ft x 22ft) external and 3.048m internal ceiling height. There is no external roof height (this was overlooked in the original Caravan Act of 1968). The unit can be constructed on site, but must have the ability to be moved in two halves, capable of being moved from one place to another (whether by being towed, or by being transported on a motor vehicle or trailer).
(See also Caravan Sites Act 1968 Statutory Instruments Amendment 1st October 2006 No. 2374).