Firefighters were called to a blaze at a house in Perivale after it was hit by a stray firework for the second time in less than a week.
Crews were first called to the house in Devon Close on Saturday evening after a rocket landed in the rear garden and caused a severe fire.
The Brigade was called to the property again on Thursday evening after a neighbour saw smoke coming from the roof.
Four fire engines and 21 firefighters and officers attended and found a small fire in the damaged roof space.
The Brigade’s fire investigation team believe the second fire was also caused by a lit firework landing in the open roof space and igniting materials inside.
With Bonfire Night approaching, the Brigade is urging people to attend organised displays. People who wish to use fireworks at private parties are urged to follow the firework safety code.
The Brigade was called at 2012 and the fire was under control at 2134. Fire crews from Wembley, Park Royal and Northolt fire stations attended the scene.