‘For the purposes of item 1(b), and for the purposes of these Notes so far as having effect for the purposes of item 1(b), a building or part of a building is “non-residential” if- (a) it is neither designed, nor adapted, for use— (i) as a dwelling or number of dwellings, or (ii) for a relevant residential purpose; or (b) it is designed, or adapted, for such use but— (i) it was constructed more than 10 years before the grant of the major interest; and (ii) no part of it has, in the period of 10 years immediately preceding the grant, been used as a dwelling or for a relevant residential purpose.’
‘The conversion, other than to a building designed for a relevant residential purpose, of a non-residential part of a building which already contains a residential part is not included within items 1(b) or 3 unless the result of that conversion is to create an additional dwelling or dwellings.’
‘Where— (a) part of a building that is constructed is designed as a dwelling or number of dwellings or is intended for use solely for a relevant residential purpose or relevant charitable purpose (and part is not); or (b) part of a building that is converted is designed as a dwelling or number of dwellings or is used solely for a relevant residential purpose (and part is not)— then in the case of— (i) a grant or other supply relating only to the part so designed or intended for that use (or its site) shall be treated as relating to a building so designed or intended for such use; (ii) a grant or other supply relating only to the part neither so designed nor intended for such use (or its site) shall not be so treated; and (iii) any other grant or supply relating to, or to any part of, the building (or its site), an apportionment shall be made to determine the extent to which it is to be so treated.’
‘(1D) For the purposes of this section works constitute a residential conversion to the extent that they consist in the conversion of a non-residential building, or a non-residential part of a building, into— (a) a building designed as a dwelling or number of dwellings; (b) a building intended for use solely for a relevant residential purpose; or (c) anything which would fall within paragraph (a) or (b) above if different parts of a building were treated as separate buildings.’