So you have the main M1 in the residence and want to run the outbuilding off that, correct? Sure, as long as you can get wire to the outbuilding that is very doable. You can set the outbuilding as a second area so it can be controlled (armed/disarmed, etc) separately. There are a few things you can do depending on how much stuff you will have in the outbuilding. You probably want at least a keypad and a few sensors. Depending on the amt of sensors, etc, you may want to put a regular 14" can with a few Cat5's to it. In the can you can put a M1DBH hub and some input/output expanders (depending on what you need). You can hook the hub back to the main unit with 1 22/4 or Cat5 and branch all the outbuilding stuff from that can. You may also want power out there again depending on what sensors, smokes, etc?