17B.— On convicting a person of an offence under this Act in proceedings brought by a building control authority, the court shall, unless it is satisfied that there are special and substantial grounds for not doing so, order the person to pay to the authority the costs and expenses, as measured by the court, incurred by the authority in relation to the investigation, detection and prosecution of the offence, including costs incurred in respect of the remuneration and other expenses of employees, consultants and advisers.]