Four fire engines and around 25 firefighters tackled a fire at a beauty salon on Finchley Road in Golders Green.
A small part of the salon on the ground floor of a terraced shop with dwellings above was damaged by the fire. There were no reports of any injuries.
The cause of the fire is believed to have been accidental and caused by an electrical fault within a treatment chair.
A London Fire Brigade spokesperson said: “Always follow manufacturers’ instructions when using electrical items, and we would advise not to leave them unattended.
The Brigade was called at 2350 and the fire was under control at 0049. Fire crews from West Hampstead and Hendon fire stations were in attendance.
Tips for electrical device safety
From overloaded extension leads and cheap chargers, through to white goods not fit for the job, issues with electrical items are a common cause of fire.
Hair straighteners can get extremely hot – always switch them off and leave them to cool on a heatproof surface.
Always check that you’re using the right fuse – if you're confused, check out our guide to fuses.