In this Part "higher-risk building" means a building in England that—
is at least 18 metres in height or has at least 7 storeys, and
contains at least 2 residential units.
The Secretary of State may by regulations make provision supplementing this section.
The regulations may in particular—
define "building" or "storey" for the purposes of this section;
make provision about how the height of a building is to be determined for those purposes;
provide that "higher-risk building" does not include a building of a prescribed description.
Regulations made by virtue of subsection (3)(a) may in particular define "building" so as to provide that it includes—
any other structure or erection of any kind (whether temporary or permanent);
any vehicle, vessel or other movable object of any kind, in such circumstances as may be prescribed.
The Secretary of State may by regulations amend this section (other than subsection (2) or this subsection).
For the meaning of "residential unit" see section 115.