Non addressable fire alarm systems are cheap and cheerful and are adequate for smaller buildings as it tells you where the fire has started using a zone indicator on the fire panel. The downside is that search times for the fire brigade are longer and it is harder to control false alarms.
Addressable fire alarm systems are far superior with more accurate zone indication as the panel can also display text e.g. ‘ground floor lounge’. Search time is cut down so the time to locate and deal with the fire is reduced. More measures can be put into place to address false alarms and it is easier to keep up with new legislation or add additional equipment, cutting down installation costs. Addressable systems are also able to incorporate wireless technology, so you can install detectors in areas you can’t get cables to.
This is why we fit addressable systems as standard. The cost differences are minimal now and if you ever need to expand due to an extension or a change of use then it costs you less in the long run.