By law, your building will need a fire alarm if it is for commercial use – the type of alarm you will need is dependent on the use of the premises, so it’s best to get a qualified installation company to do a thorough fire risk assessment to determine this.
Having said this, strictly speaking not all buildings need one. However, fire alarms are vital to protect human life, so having them installed is an exercise of caution to cover you in case of an emergency.
Fires can be life-threatening if the appropriate measures to detect and control them are not in place. We believe that prevention is the best form of protection against fire emergencies, and would recommend having a fire alarm installed, whatever your building is used for.