The one issue, when we converted the old milk house attached to the barn into a potting shed, was that there was no direct access to the outside. So, one day I convinced my father to come over and bust out a door in the concrete block. Within an hour we had an outside entrance which left me to construct a custom door. I had some ideas but was not sure which direction to go. Then enter my father again with some pre-painted salvaged wood. I decided to mimic the door that was on the inside of the potting shed and used the salvaged wood that was already painted barn red.
I was able to build the door in an afternoon. First I laid out the vertical boards that had tongue and groove so they fit together snugly. Then I nailed in the top, bottom and side boards to secure the boards together. Then I did the same on the opposite side. Once complete I cut the angled boards and installed the hinges and door latch. In an afternoon I had created a fully functioning barn door with salvaged material. The only cost was about $35 for the hinges and door latch which had to be more sturdy became of the size and weight of the finished door.