In short: Mandatory occurrence reporting is the duty on the Principal Accountable Person (PAP) of an occupied higher-risk building to report prescribed safety occurrences - structural safety or spread-of-fire risks that could realistically cause death or serious injury - to the Building Safety Regulator (BSR). It is a duty under the Building Safety Act 2022 and the regulations made under it.
The Principal Accountable Person for an occupied higher-risk building. The PAP must also put in place a mandatory occurrence reporting system so that relevant safety information reaches them and can be assessed.
Broadly, a structural-safety or fire-safety event - or a situation that could lead to one - that, if realised, could cause a significant number of deaths or serious injury to a number of people. Examples include serious structural failures or fire-safety failures affecting the building's safety.
Reportable occurrences must be notified to the BSR promptly, with a fuller report following. The PAP must keep records of occurrences and reports as part of the golden thread.
CTS helps the accountable person set up a compliant MOR system, assess whether an event is reportable, and make the report. On the CTS BuildSafe platform, occurrences and reports are logged to the golden thread with an audit trail, so the building's record stays current and BSR-ready.
This guide is general information, not legal advice. Reviewed by the CTS building safety team against the Building Safety Act 2022 and the regulations made under it.