Windsor Fire and Rescue Services responded to a fire on Baseline Road on Friday afternoon.
The fire in a medium-sized workshop broke out just before 1 p.m. on Baseline at County Road 17. Firefighters quickly controlled the blaze.
One person was treated for 2nd degree burns to both hands.
A fire investigator remained on the scene until Friday evening. A cause was not immediately determined, but fire officials say an electrical source in the area of origin could not be ruled out.
Damage is estimated at $400,000 to the building and its contents.