Where the local housing authority are satisfied that—
the work required to reinstate the defective dwelling is more extensive than that stated in the notice of determination or in a previous notice under this section, or
the amount of the expenditure which may properly be incurred in executing that work is greater than that so stated, or
there is an amount of expenditure which may properly be incurred in entering into an associated arrangement but no such amount is stated in the notice of determination or a previous notice under this section, or
where such an amount is so stated, the amount of expenditure which may be properly so incurred is greater than that amount,
they shall by notice in writing served on the person entitled to assistance state their opinion as to that amount or, as the case may be, that work and that amount; and the amount of reinstatement grant shall be adjusted accordingly.