Section 29 of the Caravan Sites Act 1968 states that the structure must be physically capable of being moved from one place to another by road and that the twin unit must be no more than 60ft (18.288 metres) long, 20ft (6.096 metres) wide and the living accommodation no more than 10ft (3.096 metres) high.
The question of whether any individual mobile home is within this definition can only be decided finally by your local Planning Department who will be able to advise you on what you can build. Anybody who is not sure whether the definition applies to his/her mobile home should consult his/her local authority planning department.
Please read this very interesting article relating to: PLANNING FOR MOBILE HOMES
