Six fire engines and around 40 firefighters tackled a fire at a fish and chip shop on Kingston Road in Teddington.
Part of a fish and chip shop with flats above was damaged by fire. One man was taken to hospital.
Firefighters checked neighbouring properties for fire spread and ventilated the premises.
The fire is believed to have been accidental and caused by a fault with a commercial deep fat fryer.
The Brigade was called at 1223 and the fire was under control by 1347. Fire crews from Twickenham, Surbiton, Heston, Wimbledon and surrounding fire stations attended the scene.