In a workplace the author is usually internal: a manager or health and safety adviser assessing an operation they understand from the inside. For the common parts of residential blocks it is more often an external specialist carrying out a Type 1 inspection, because judgements about construction, compartmentation and evacuation strategy sit beyond most in-house roles. The completeness bar is identical either way: significant findings, the people especially at risk, measures taken and planned, and reasoning that connects the evidence to each conclusion.
There is no single official form to hunt for. HSE publishes example templates for general workplace assessments, and housing fire risk assessments normally follow the structure of BS 9792:2025 or the PAS 79 lineage before it. Format matters far less than content: the five contents every record needs are set out under what are the 5 things a risk assessment should include, and a handsome template with hollow reasoning fails the same legal test as a scruffy one.