Kent Fire and Rescue Service was called to a fire in a property on Hornash Lane in Shadoxhurst early on Saturday morning.
Four fire engines were sent to the incident.
Crews arrived to find a weatherboarded property that is under development well alight with several seats of fire.
Firefighters used hose reel jets and main jets to extinguish the fire. There were no reported injuries and the cause of the fire is yet to be established.
An arson investigation into the cause has been launched and the finding if suspicious will be shared with Kent Police.