They apply to any of the following:
the erection of a building;
the extension of an existing building;
the installation of certain services of fittings;
the alteration of an element of a structure that will permanently affect its ongoing compliance with Building Regulations.
the insertion of insulation into a cavity wall;
the alteration of elements that relate to fire access to a building;
work which will directly influence the energy performance or thermal elements of a building.