A commercial building on Rye Lane, Peckham caught fire in the early hours of this morning, Wednesday May 11.
Four fire engines and around 25 firefighters were alerted to the blaze at 3.17am.
They had brought it under control an hour later at 4.15am.
Fire crews from Peckham, New Cross, Old Kent Road and Brixton fire stations were mobilised.
The London Fire Brigade believes the cause was electrical.