Four fire engines and around 25 firefighters tackled a fire at a detached bungalow on Maidstone Road in Sidcup.
Half of the roof was damaged by the fire. Four people left the building before the Brigade arrived. There are no reports of any injuries.
Control Officers took the first of five calls at 1407 and mobilised crews from Orpington, Bexley, Eltham and New Cross fire stations to the scene. The incident was over for firefighters at 1534.
The fire is believed to be accidental and was caused by combustible items placed too close to a heat source.