More than 40 firefighters tackled a blaze at a house in Hayle overnight.
Fire crews initially believed people were inside the property in Trelissick Road.
Emergency services were called to the scene just before 12.30am. Firefighters from Camborne and St Ives found the porch had been completely destroyed and the fire had spread to the roof.
As the fire spread more crews were called out until there were a total of 42 firefighters on the scene.
A spokesman for the fire service said firefighters from Penzance were called out as well as units from St Just and Falmouth.
By 3.30am the fire was out and the crews were "damping down" the site.
A fire investigation has been completed but no further details are available.
