11. Requirements relating to a material change of use.

There is a material change of use where there is a change in the purposes for which or the circumstances in which a building1 is used, so that after that change:

(1)     the building is used as a dwelling2, where previously it was not3;

(2)     the building contains a flat4, where previously it did not5;

(3)     the building is used as an hotel or a boarding house, where previously it was not6;

(4)     the building is used as an institution7, where previously it was not8;

(5)     the building is used as a public building9, where previously it was not10;

(6)     the building is not exemp