Once framing is complete, the windows are installed. During this stage, the electrical, plumbing, and heating/cooling systems are installed. The customer does a walk-through, deciding the positions of lights, switches and special outlets. This is also the time to specify any other auxiliary systems, such as alarms, audio/video wiring, or computer wiring. Before insulating the home, all of the wiring, plumbing and ductwork are documented with photographs in case there is ever a need to access these systems.