Four fire engines and around 20 firefighters and officers were called to a fire at a beauty salon in Masons Hill, Bromley.
Part of the basement of the salon was damaged by fire.
The Brigade was called at 0057 and the fire was under control at 0159. Fire crews from Bromley, Beckenham and Woodside fire stations attended the scene.
The fire is believed to be accidental due to combustibles being left too close to a heat source.