Is there any builders in this group who could give me a rough idea of how much it would cost to put in a door into my stand alone garage. The garage is next to my back yard but I need to walk around to the front and enter through the main door on the street side - it would be excellent if I had a door leading out the the backyard. The walls are a plain wooden frame with the black plastic sheeting inside, no gib inside just on the outside, there is also already a small louvre window on the side I want the door so that could even be turned into a door perhaps? I am in Hillcrest.