Four fire engines and 21 firefighters and officers attended a fire at a shop with flats above it on Garratt Lane in Earlsfield, in the early hours of this morning.
A single storey outbuilding made from timber was completely damaged by fire.
No-one was injured in the fire.
Firefighters from Wandsworth, Battersea and Wimbledon fire stations attended the incident.
The Brigade was called at 0044 and the fire was under control at 0146. The cause of the fire is under investigation.