Mandatory Occurrence Reporting under the Building Safety Act 2022 and The Building (Higher-Risk Buildings Procedures) (England) Regulations 2023 (SI 2023/909, Part 4)

Mandatory Occurrence Reporting under the Building Safety Act 2022 and The Building (Higher-Risk Buildings Procedures) (England) Regulations 2023 (SI 2023/909, Part 4). Statutory mandatory occurrence reporting (MOR) duties for principal designers, principal contractors and principal accountable persons in higher-risk buildings. Established by the Building Safety Act 2022 and operationalised by SI 2023/909 Part 4 with BSR/HSE guidance (published 31 January 2024, last updated 4 September 2025). This page provides a structured summary, key provisions, and practical guidance on the application of Mandatory Occurrence Reporting Regime (BSA 2022 + SI 2023/909 Part 4) to UK fire safety engineering, building design, and Building Safety Act compliance.