Four fire engines and around 25 firefighters were called to an outdoor fire on Upper Tooting Road, Tooting.
Two wooden storage units were damaged by the fire, while a motorcycle and nearby fences were destroyed.
There were no reports of any injuries.
The Brigade’s Control Officers took the first of 12 calls at 04:28 and mobilised crews from Tooting, Wimbledon, Clapham and surrounding fire stations. The incident was under control by 0553.
The cause of the fire is undetermined.