Four fire engines and around 25 firefighters tackled a fire at a single storey cabin at the end of a pier on Wharfside Close in Erith.
The cabin was destroyed by the fire. There were no reports of any injuries.
Control Officers took the first of 18 calls at 1636 and mobilised crews from Erith, Bexley, Plumstead and Sidcup fire stations to the scene. The incident was over for firefighters at 1833.
The cause of the fire is under investigation.