(b) If any order of the board of health or other enforcing agency is not complied with, or not so far complied with as the board or other enforcing agency regards as reasonable, within five days after the service thereof, or within such shorter time as the board or other enforcing agency designates, such order may be executed by the board or other enforcing agency, through its officers, agents, employees or contractors. The expense of executing such order, including an amount not to exceed five per cent of the expense thereof as a service charge and ten per cent of the expense thereof as a penalty shall be collected from the owner by an action in the name of the city, borough or town.