Four fire engines and around 25 firefighters were called to a fire on Rayners Lane in Harrow.
A shed between two houses was destroyed by the fire. Part of the roof of one property was damaged and part of the soffits and facia of another property were also damaged. There were no reports of any injuries.
The Brigade was called at 1602 and the fire was under control by 1648. Fire crews from Northolt, Harrow and Wembley fire stations attended the scene.
The cause of the fire is under investigation.