Six fire engines and around 40 firefighters tackled a fire at an end of terraced house on Warwick Road in New Malden.
Part of the ground floor was damaged by the fire. There were no reports of any injuries.
Control Officers took the first of three calls at 0314 and mobilised crews from New Malden, Surbiton, Kingston and surrounding fire stations to the scene. The fire was extinguished by 0546.
The fire is believed to have been accidental and was caused by an electrical fault.