A faulty hot water cylinder sparked a blaze that damaged a house.
Part of the first floor and most of a dormer extension were damaged in the fire in Wembley on Saturday.
A total of six fire engines and around 40 firefighters were called to the blaze in Bowrons Avenue at 10.21am.
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Crews used one of the London Fire Brigade's 32m turntable ladders as an observation tower as they tackled the flames.
The fire was under control by 11.43am.
A hot water cylinder was destroyed but there were no reports of any injuries.
The fire is believed to have been accidental and caused by a fault in a hot water cylinder.
Firefighters from Wembley, Park Royal, Acton and surrounding fire stations attended the scene.
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