Firefighters tackled a fire at an outbuilding on Seaton Road in Hayes.
A small part of a single-storey outbuilding was damaged by fire. Firefighters evacuated around 12 people from surrounding properties. There were no reports of any injuries.
A 25-metre cordon was put in place as a precaution and firefighters removed and cooled two gas cylinders to an ambient temperature as some cylinders can explode when exposed to heat.
The Brigade was called at 2307 and the fire was under control by 0004. Two fire engines from Hayes and Heathrow fire stations attended the scene.
The fire is believed to have involved cooking.