Twelve fire engines and around 80 firefighters tackled the fire in Blackfen Road just after 1pm yesterday (July 22).
The ground and first floor, the roof of a shop with flats above, along with part of the roof of an adjacent building were alight.
The property’s first floor collapsed.
There were no reports of any injuries.
Station Commander Steve Howlett, who was at the scene, said: “This was a very visible fire which produced a significant amount of smoke in the area.
“We advised people who live and work in the vicinity to keep windows and doors closed.
“One of our 32-metre turntable ladders was used as a water tower at the incident, to help tackle flames from height.
“Blackfen Road was closed and some bus routes were affected.
“We asked people to avoid the area while we worked to make the scene safe.”
The blaze was under control just before 4.40pm.
The fire is believed to have been accidental and caused by hot works, according to the London Fire Brigade.
