What Size TV for My Livingroom? When it comes to your living room and your television set, size does matter. It really depends on where you will be placing your television set. Considering a flat panel for my living room which is approx 17’x14′, the best place to mount TV is in a corner & our normal viewing distance diagonally is approx 12′-13′. Find more info about What Size TV for My Livingroom.