Every person to whom sanction for the erection or re-erection of any building in any area in a cantonment has been given under section 237 or section 238 by the Chief Executive Officer or, as the case may be, by the Board shall, within thirty days after completion of the erection or re-erection of the building give a notice of completion in writing to the Chief Executive Officer or the Board, as the case may be, and the Chief Executive Officer or the Board shall on receipt of such notice cause the building to be inspected in order to ensure that the building has been completed in accordance with the sanction given by the Chief Executive Officer or the Board, as the case may be.