Higher-risk buildings in occupation The Accountable Person and Building Assessment Certificate
The Accountable Person is the dutyholder during occupation. They may be an individual, partnership or corporate body and there may be more than one Accountable Person for a building.
	Where there are multiple Accountable Persons in a building, one of them will be identified as the lead Accountable Person, known as the Principal Accountable Person. There will be a duty on Accountable and Responsible Persons in a building to cooperate with each other and with the Principal Accountable Person. It will be backed up by enforcement and sanctions, so that it becomes an offence not to cooperate. Where reference is made to the duties of an "Accountable Person", this should be taken to also mean duties to be either discharged and/or coordinated by a Principal Accountable Person in circumstances where there are multiple Accountable Persons in a building.
	The Act places a duty on the Accountable Person to register any building that is in scope of the new regime with the Building Safety Regulator before it becomes occupied. Existing occupied buildings will have to be registered within a fixed transition period following the new regime coming into force.
	The Act places a duty on the Accountable Person to apply to the Building Safety Regulator for a Building Assessment Certificate. The Building Safety Regulator will issue a Building Assessment Certificate if it is satisfied that the Accountable Person is complying with the statutory obligations placed on them. The Accountable Person is required to display the most recent issue of the certificate in a prominent position in the building.