A gas turbine enclosure apparatus is provided and includes a frame defining an interior, gas turbine equipment disposed in the interior, the gas turbine equipment being pre-assembled at a first site and connectable with a gas turbine disposed at a second site and wall panels connectable with the frame. The apparatus being disposable proximate to the gas turbine such that the gas turbine equipment is exposed to the gas turbine and a portion of the wall panels form a portion of an outer enclosure of the gas turbine and the gas turbine equipment.