A chassis for a barrier operator is provided. The barrier operator includes a motor and a transmission configured to cooperate with a rail system to move a barrier. The chassis includes a unibody frame having a first portion, a second portion, and a third portion. The first portion is configured to receive and secure the motor to the unibody frame. The second portion is configured to receive and secure the transmission to the unibody frame. The third portion is configured to receive and secure at least a portion of the rail system to the unibody frame. The first, second, and third portions are formed as a single, integral component.