Four fire engines and around 25 firefighters tackled a house fire on West Heath Road in Hampstead.
Part of the lower-ground floor of a detached house was damaged by fire. There were no reports of any injuries.
The Brigade’s Control Officers were called at 0134 and the fire was under control by 0310. Fire crews from Soho, Kentish Town and Finchley fire stations attended the scene.
The fire is believed to have been accidental but the exact cause has been recorded as undetermined.