In this Part—
“dwelling” means a building or part of a bulding occupied or intended to be occupied as a separate dwelling, together with any yard, garden, outhouses and appurtenances belonging to it or usually enjoyed with it;
“improvement” includes alteration and enlargement and, so far as also necessary to enable a dwelling to reach the full standard or the reduced standard, repair, and “improved” shall be construed accordingly;
“long tenancy” has the same meaning as in Part I of the [1967 c. 88.] Leasehold Reform Act 1967;
“owner”, in relation to a dwelling, means the person who otherwise than as a mortgagee in possession, is for the time being entitled to dispose of the fee simple in the dwelling;
“owner-occupier”, in relation to a dwelling, means the person who, as owner or as lessee under a long tenancy, occupies or is entitled to occupy the dwelling, and “owner-occupied” shall be construed accordingly;
“standard amenities” has the same meaning as in Part XV (improvement grants, &c.).