Ten people were evacuated after a blaze at flats in Wembley on Saturday (September 24).
Four fire engines and 21 firefighters and officers were called to the fire in Preston Road.
Electrical trunking from the ground floor to first floor was damaged by the fire.
Ten people were evacuated from the property before the arrival of London Fire Brigade (LFB), and there were no reports of any injuries.
LFB was called at 8.14pm and the fire was under control at 11.45pm.
Fire crews from Wembley and Stanmore fire stations attended the scene.
The cause of the fire is under investigation.
It comes after around 60 firefighters battled a blaze at a Wembley recycling centre over night after a heap of rubbish caught light last month.
The fire broke out in the early hours of August 12 at the industrial site in Hannah Close, just off Great Central Way, and eight engines fought to bring it under control.
A spokesperson for the London Fire Brigade (LFB) said the cause of the fire is unknown.