Four fire engines and around 25 firefighters were called to a bungalow fire on Rannock Avenue in Kingsbury.
Part of the roof of a semi-detached bungalow was damaged by the fire as well as part of the roof of an adjoining property. There were no reports of any injuries.
The Brigade was called at 1149 and the fire was under control by 1313. Fire crews from Wembley, Stanmore, Willesden and West Hampstead fire stations were at the scene.
The fire is believed to have been accidental and caused by hot works.