Service of stop-work orders. The Code Enforcement Officer/Building Inspector shall cause the stop-work order, or a copy thereof, to be served on the owner of the affected property (and, if the owner is not the permit holder, on the permit holder) personally or by certified mail. The Code Enforcement Officer/Building Inspector shall be permitted, but not required, to cause the stop-work order, or a copy thereof, to be served on any builder, architect, tenant, contractor, subcontractor, construction superintendent, or their agents, or any other person taking part or assisting in work affected by the stop-work order, personally or by certified mail; provided, however, that failure to serve any person mentioned in this subsection shall not affect the efficacy of the stop-work order.