Firefighters were called to Church Road, Pendeen, St Just on Sunday after reports of a fire in the roof of the vicarage.
Cornwall fire control received the first call just before noon after a report of a property with smoke coming from the roof.
Two appliances from St Just with nine crew were mobilised, with a second appliance from Penzance with five crew also mobilised.
A 'make pumps four' call was issued when the St Just fire crewsarrived as there was smoke pouring from the roof of the building.
The fire had taken hold in a quarter of the roof and first floor of the building and a second appliance from Penzance with five firefighters and an appliance from St Ives with six firefighters were drafted in to help.
At 12:12 crews were using four breathing apparatus to tackle the fire and one breathing apparatus team entered the roof space to check the spread of the fire.
A triple extension ladder was used, along with a thermal imaging camera one main jet and a hose reel jet.
By 1.08pm six breathing apparatus were in use as crews ventilated the building and checked for hot spots.
The fire was brought under control by 3pm, with the fire having spread to the ground floor, causing smoke damage through out the building.
An investigation into the fire will be carried out this morning (Monday).