Firefighters were called to a caravan on fire on Friday morning, as the blaze spread to a nearby building.
The crews from Stradbroke and Diss were called to Horham Road in Denham, near Stradbroke, just after 1.50am.
They found a derelict caravan alight, which had spread to an old storage building - measuring 10 metres by five metres - and a car.
The crews used hose reels to put out the blaze and were back at base just after 4am.
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