Six fire engines and 35 firefighters and officers were called to a fire at a house in Willesden Lane, Willesden Green.
Part of the first and second floors of the property were damaged. The roof of the house was also damaged in the blaze.
The Brigade was called at 0138 and the fire was under control at 0636.Fire crews from Willesden, West Hampstead, Park Royal and North Kensington fire stations attended the scene.
The cause of the fire is under investigation.