89.The purpose of this section is to ensure that category 1 and category 2 buildings are registered with the building safety authority before they are occupied. The meaning of “occupied” is given in section 136.
90.The principal accountable person for a category 1 or category 2 building commits an offence if the building is occupied but not registered. The offence is triable either way. It is a defence to prove that the principal accountable person had a reasonable excuse for the building being occupied but not registered. See also section 110 (fixed penalty notices).
Commentary on Sections Part 1 - Safety of Buildings Containing Two Or More Residential Units Requirement to register and registration procedure Section 19 - Requirement to register category 1 buildings and category 2 buildings