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An investigation is underway after a wooden shed and a concrete outbuilding caught light in Tonbridge Road, Maidstone.
Two fire engines rushed to the road at 4.15am and crews spent just over an hour tackling the flames.
Nearby buildings were also damaged.
A Kent Fire and Rescue Service spokesman said: "The fire also caused damage to a window frame, fascia and guttering of an adjacent brick building.
"Two fire engines attended and crews used a hose reel to extinguish the blaze."
The cause of the fire is being investigated.