The blaze broke out just after 11.30pm in Bradninch.
Crews from across the county were at the scene throughout the night.
The roof has been completely destroyed and the first floor of the property has significant damage.
It's not thought anyone was injured in the fire.
Turnout for police and crime commissioner election drops as count continues
Just over a fifth of possible voters went to the poll for the PCC
Alison Hernandez secures third term as police and crime commissioner
She'll continue tackling major issues on her to-do list
How Exeter's traffic troubles influenced council vote
LTN campaigner ousts Labour candidate
Labour tightens grip on Plymouth City Council power
They've gained nine extra seats
Radio Exe newsreader to abseil down Exeter Cathedral
Josh Tate will descend over 100 feet on Saturday
Labour retains control of Exeter City Council
Despite losing a seat to the Greens and an independent
