No person shall erect or re-erect a building on any land in a cantonment--
         (a) in an area, other than the civil area, except with the previous sanction of the Board;
         (b) in a civil area, except with the previous sanction of the Chief Executive Officer,
nor otherwise than in accordance with the provisions of this Chapter and of the rules and bye-laws made under this Act relating to the erection and re-erection of buildings:
     Provided that if an erected or re-erected building is meant for public purposes, then it shall be made accessible to and barrier free for the persons with disabilities.