Firefighters are issuing a safety reminder about smoking after a fire at an outbuilding on Chingford Road in Walthamstow.
Part of a single storey building was destroyed by fire.
The fire is being treated as accidental and is believed to have been caused by the unsafe disposal of smoking materials.
Station Officer Carl Gibbons was at the scene, he said: "Crews wearing breathing apparatus extinguished the fire.
"If you smoke it's vitally important you stub it right out, preferably in an ashtray.
"Always ensure your cigarette is completely out when you’ve finished smoking it. If you don’t, you risk causing a fire."
The Brigade was called at 2155 and the incident was over for firefighters at 2331. Four fire engines and around 25 firefighters from Walthamstow, Leyton and Tottenham fire stations attended the scene."