I moved my business into a new building, and there is a doorway i want to put up a door in it. However the doorway is about 1/4" narrower at the bottom, than the top. Neither of the top corners are square. I am looking for the easiest way with the least amount of work and knowledge needed to hang this door. It is only a barrier, it is not for security. It will be closed most of the time, so i am not worried if it is going to naturally swing open or closed.
Also, the cuts for the hinges on the door and the frame do not line up. I am fine with buying a new door, but I would rather not replace the frame of i can avoid it.
Any suggestions?
Are you aware that the door is upside-down?
The knob should be below the center point, not above it.
That aside, the best way to deal with your stated problem is to fix the frame. You don't need to completely redo it. Just figure out which side of the frame isn't straight up and down, get a thinner replacement piece for that side, and put some spacers under the top end. Then fill in the gap with some wood filler and paint it to match.
Alternatively use a planer or something similar to shave off some depth at the tighter end of that frame piece. I've used an oscillating multitool for something very similar. Getting it flat will be tricky but it's doable.
Flip the door right-side up first though.
Isn't just taking a plane to the door a solution too?
if its an interior door, theyre hollow inside
Hollow doors have about a 1" frame of solid wood around the perimeter.