(1)Section 32(1)(b) of the Act of 1958 (which limits the amount of an improvement grant under Part II of that Act for each dwelling provided by the improvement works to four hundred pounds or such other amount as may be prescribed) shall have effect in relation to a dwelling provided by a conversion of a house which consists of three or more storeys as if for the words " four hundred pounds " there were substituted the words " five hundred pounds ".
(2)The reference in the foregoing subsection to the number of storeys shall, if any of the dwellings provided by the improvement works is a dwelling all or part of which is in the basement, include the basement as one of the number of storeys of the house.
(3)The Minister's power under the said section 32(1)(b) to vary the amount specified in that paragraph shall be exercisable separately as respects the amount of four hundred pounds mentioned in that section and as respects the amount of five hundred pounds substituted by this section in the cases specified in this section.
(4)This section shall not have effect as respects applications made to a local authority before the coming into force of this section.