Firefighters were called to an outbuilding on fire in Harold Hill on Sunday morning.
They were called to the building, in the garden of an empty property on St Neots Road, at around 6am.
The wood building, which looked like it had once been a bar, completely collapsed in the blaze.
Crews from Wennington, Romford and Harold Hill tackled the fire, which was out by 8.30am.
The cause of the incident is being investigated.
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