Section 45

When the Director has incurred costs and expenses in or about the execution of any work, which are, under this Act, payable by or recoverable from the owner or owners, the Director may either recover those costs and expenses in the manner provided in section 44 or, if he thinks fit, may take an engagement or engagements from the owner or owners for the payment of such instalments as will be sufficient to defray the whole amount of the costs and expenses with interest thereon at a rate not exceeding 6% per annum, within a period not exceeding 10 years.

Upon default in payment of any instalment or interest upon the date appointed for payment thereof by any such engagement the whole of the balance then outstanding of that amount, together with any interest in arrear, shall immediately become due and payable and, notwithstanding any change in the ownership or occupation of the premises since the date of the engagement, may be recovered by the same means and in like manner as provided in section 44.[44