Four fire engines and 21 firefighters and officers were called to a small fire at a building site in Breach Lane, Dagenham.
Some natural gas was alight. A 100m safety cordon was put in place as a precaution and crews evacuated 14 people from the site.
There were no reports of any injuries.
The Brigade was called at 1312 and the incident was over for us at 1608. Fire crews from Barking and Dagenham fire stations attended the scene.
The cause is not known at this stage.