Filmmakers Scott Beck and Bryan Woods wrote the script for Haunt (2019) while they were also writing the screenplay for A Quiet Place (2018), without the expectation that either film would ever get made.
Damian Maffei, who portrays the "Devil" character, also provided the voice for "Harper's Dad" in the flashback scene in the bedroom.
The filmmakers visited various haunted house attractions in Kentucky.
The interiors for the haunted house attraction were all sets built inside of a dairy factory.
The crew dressed up in costumes for Halloween, which was one of the days this movie was shot on.