12. Continuing requirements.

Building regulations1 may impose on owners2 and occupiers of buildings to which building regulations are applicable such continuing requirements as the appropriate national authority3 considers appropriate for securing, with respect to any designated provision of building regulations4, that the purposes of that provision are not frustrated; but a continuing requirement so imposed does not apply in relation to a building unless a provision of building regulations so designated as one to which the requirement relates applies to that building5. Building regulations may impose on owners and occupiers of buildings of a prescribed6 class (whenever erected, and whether or not