Schedule 6 to this Act (which makes provision with respect to the determination of a day as the completion day in relation to a new building which, or any part of which, will constitute or constitutes a dwelling) shall have effect.
A dwelling in a new building shall be deemed for the purposes of this Part to have come into existence on the day determined under that Schedule as the completion day in respect of that building, whether or not the building is completed on that day.
Where—
the existing dwelling or dwellings shall be deemed for the purposes of this Part to have ceased to exist on that day.
Any reference in this section or that Schedule to a new building includes a reference to a building produced by the structural alteration of an existing building where—
Any reference in this section or that Schedule to a building includes a reference to a part of a building.