Four fire engines and around 25 firefighters were called to a fire in a warehouse annex in Crown Road, Enfield.
A small part of the annex was damaged by fire. Around 150 staff members left the neighbouring warehouse before firefighters arrived.
The Brigade was called at 1004 and the fire was under control by 1204. Crews from Edmonton and Tottenham fire stations attended the incident.
The cause of the fire is under investigation.