Penalty for building without sanction.

If the erection or re-erection of a building is begun or continued- (a) without sanction as required by sub-section (1) of section 162 or (b) without notice as required by sub-section (2) of section 162 or (c) after sanction has been refused or (d) in contravention of the terms of any sanction granted or (e) after the sanction has lapsed or (f) any contravention of any bye-law made under section 163 the Municipality may by notice to be delivered within a reasonable time require the building to be altered or demolished as it thinks necessary within a space of thirty days from the date of service of such notice: Provided that no such notice shall issue in respect of the contravention of any bye-law the observance of which has been dispensed with under section 165: Provided further that the Municipality may instead of requiring the alteration or demolition of any such building accept by way of compensation such sum as it thinks reasonable.