18. Suspension and Revocation of permit

 The Secretary shall stay, suspend or revoke any permit issued under these rules if it is satisfied that the permit was issued by mistake or that a patent error has crept in it or that the permit was happened to be issued on misrepresentation of fact or law or that the construction if carried on will be a threat to life or property: Provided that before revoking permit, the owner of the permit shall be given 7 days notice, and an opportunity of being heard to explain and the explanation shall be duly considered by the Secretary.