Six fire engines and around 40 firefighters tackled a fire at a restaurant on Upper Richmond Road in Putney.
The extraction system from the ground to the second floor of the building was destroyed by fire. Part of the ground floor was also damaged by the blaze. There were no injuries reported.
Firefighters used one of the Brigade's 32-metre turntable ladders at the scene as an observation tower.
The fire is believed to have been accidental and caused by the ignition of a build-up of fats and oils within the extraction system.
A London Fire Brigade spokesperson said: “We’d like to remind restaurant and takeaway owners to ensure they don't have dirty ducting. If you don't clean the ducting in your extraction system regularly, you're at a greater risk of ducting fires”.
The Brigade was called at 1540 and the fire was under control by 1803. Firefighters from Twickenham, Chelsea, Chiswick, Fulham, Wandsworth and Hammersmith fire stations attended the scene.