Section 40 Houses built without notice, or contrary to provisions of this or the special Act, may be altered.

In default of sending such notice and plan, or if such building be begun or made at any level different from that fixed by the commissioners within the said fourteen days, or determined on appeal as after mentioned, or in any other respect contrary to the provisions of this or the special Act, the commissioners may, if necessary, cause such building to be altered or demolished, as the case requires, and the expence incurred by the commissioners in respect thereof shall be repaid to them by the person failing to comply with the provision aforesaid, and shall be recoverable as damages.