At least 70 firefighters and ten engines are at the scene of the blaze on Balmoral Drive, Hayes.
The fire is believed to have started in a range of garages behind a row of houses.
In a statement, London Fire Brigade said: “Ten fire engines and around 70 firefighters are tackling a blaze in a range of garages on Balmoral Drive in Hayes.”
It went on: “While we tackle the Hayes garages blaze we’d ask local residents to remain indoors with their windows and doors closed.
“Ten tonnes of rubbish and a caravan are also alight.”
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