According to Connecticut State Police, the report came in around 8:42 a.m. regarding a barn at 81 Litchfield Turnpike.
The victim has been identified as 38-year-old Joister Pacheco-Attaide of Danbury.
Authorities said he was on site doing work on the barn with other contractors.
News 8’s Noelle Gardner reports the owners moved into the property in September.
The remainder of the structure has been knocked down.
The incident is under investigation.