A Fire Risk Assessment is a legal requirement. If you are responsible for a building, for example a employer, owner or occupier of premises that aren't a 'single private dwelling' (a private home), you need to make sure a suitably competent person completes a Fire Risk Assessment. It is your duty to identify fire risks and hazards in your premises and take appropriate action.
In addition, if five or more people work at your premises, you’ll need your fire risk assessment to be a written record. Make sure you review your risk assessment regularly and whenever significant changes have been made that would have an impact on it. It’s good business sense as well as a legal requirement, often businesses don’t recover after a fire, and effective fire prevention starts with properly understanding the risks.