Crews from Mablethorpe, Alford, Skegness and North Somercotes were alerted at 1.48am.
A Tweet from Lincolnshire Fire and Rescue said 30 per cent of the building suffered fire damage.
It stated: “Fire damage to 30% of unoccupied building, extinguished using 2 main jets, 3 hose reels & 2 BA stage 1.
“Cause of the fire is still under investigation. All crews have now left the incident.”