If a building is demolished by a local authority under section 27(7)(b), 29(2) or (3) or 30(4)(b), the authority may sell any building material arising from the demolition.

The authority may set off the proceeds of any such sale against any sum recoverable by it from the owner of the building or any other person under section 25(7)(b), 26(3)(b), 27(7)(b), 28(10)(b), 29(2) or (3) or 30(4)(b).

If the proceeds of sale exceed the total of any such sums, the authority must account to the owner or, as the case may be, the other person for the surplus.