Six fire engines and around 40 firefighters were called to a fire at a pub with offices above on White Post Lane in Hackney Wick.
Half of an external storage area on the ground floor of the building was damaged by fire and part of the first floor offices and the roof were also damaged by the blaze. There were no reports of any injuries.
The Brigade’s 999 Control officers took 15 calls to the fire.
The fire is believed to have been caused by a barbecue placed too close to a wooden door.
Sub Officer Cassius Frankson, who was at the scene, said: “Crews worked incredibly hard to quickly bring the fire under control.
“This incident shows just how important it is to place barbecues safely away from anything that could catch fire.
“It’s vital that you place them on level ground, far away from things like sheds, fences or trees and out of the reach of children and pets.”
The Brigade was called at 0009 and the fire was under control by 0151. Fire crews from Leyton, Bethnal Green, Leytonstone, Poplar and surrounding fire stations attended the scene.