Cornwall Fire Service were called just before 3pm yesterday to several reports of a shed on fire in Porthkea, near Truro.
Two fire engines from Truro arrived and established that a portable building measuring approximately six metres by three metres was fully alight.
A fire service spokesperson said: "Firefighters wearing two breathing apparatus used one jet and one hose reel to tackle the fire.
"An ambulance was requested to attend to a male casualty suffering from smoke inhalation, after being checked over by paramedics the casualty was taken to hospital."
Crews took at least an hour to cut away the area and damp down.
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