(1) Expenditure is eligible expenditure for the purposes of this Chapter where it is -
(a) expenditure incurred on -
(i) the construction of a house, other than a house referred to in subparagraph (ii), or
(ii) the necessary construction of a house which fronts on to a qualifying street or is comprised in a building or part of a building which fronts on to a qualifying street,
(b) conversion expenditure, or
(c) refurbishment expenditure.
(2) In this Chapter 'conversion expenditure' means, subject to subsection (3), expenditure incurred on -
(a) the conversion into a house of -
(i) a building which fronts on to a qualifying street or the site of which is wholly within a tax incentive area other than the site of a qualifying park and ride facility, or
(ii) a part of a building which fronts on to a qualifying street or the site of which is wholly within a qualifying urban area or a qualifying town area,
where the building or, as the case may be, the part of the building has not been previ
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