A stray firework is believed to have caused a fire at a house on Station Lane in Hornchurch.
A large part of the loft of a mid-terraced house was damaged by the fire. Eight adults and four children left the building before the arrival of the Brigade and a further three people left neighbouring properties. There were no reports of any injuries.
The Brigade's fire investigation team believe a firework from a nearby private display landed on the roof of the house.
A London Fire Brigade spokesperson said: "This incident goes to show just how dangerous fireworks can be.
"We would rather you went an organised display as they are much safer, but if you do hold a display at home it is essential to always follow the firework safety code.
"Fireworks are explosives and can be extremely dangerous and it is fortunate nobody was hurt in this incident."
• If you’re having your own fireworks display, plan your firework display to make it safe and enjoyable, and ensure it finishes before 11pm
• Only buy fireworks which carry the CE mark, keep them in a closed box and use them one at a time
• Read and follow the instructions on each firework using a torch if necessary
• Light the firework at arm's length with a taper and stand well back
• Keep naked flames, including cigarettes, away from fireworks
• Never return to a firework once it has been lit
• Don't put fireworks in pockets and never throw them
• Direct any rocket fireworks well away from spectators
• Never use paraffin or petrol on a bonfire
• Build your bonfire clear of buildings, sheds, fences and hedges
• Make sure that the fire is out and surroundings are made safe before leaving
• Don’t leave bonfires unattended. An adult should supervise it until it has burnt out. It if has to be left, damp it down with water
• Always keep a bucket of water or a hosepipe nearby in case of emergency
The Brigade was called at 1959 and the fire was under control at 2136. Four fire engines and around 25 firefighters from Hornchurch, Dagenham and Romford fire stations attended the scene.