Four units of Dublin Fire Brigade were called out to deal with a fire at Domino's Pizza in Glenageary in the early hours of Monday morning.
Dublin Fire Brigade received a call alerting it to the incident at 1.20am, and units from Dún Laoghaire, Nutgrove and the North Strand battled the blaze for two hours before it was eventually brought under control after 3am.
There were no injuries reported and everyone was safely evacuated from the scene, a fire brigade spokesman confirmed.
It is not known how the fire broke out.