Make sure you jot your measurements down.
How to make an exterior door frame smaller.
Cut the door header.
If a door is not planned determine the size of the finished opening and add 5 8 of an inch for drywall at each side of the opening.
Measure the doorway where you ll be installing your door.
If you re narrowing the frame by more than an inch remove the hinge side.
Mark the width of the smaller framed opening on the floor at the.
Pry off the door casing and the knob side and top jambs with a pry bar if you only need to fur out one side of the frame.
The larger door space should look as if its design is original to the home s construction.
Before you get to sawing gluing and sanding you ll need to know exactly how big your door needs to be.
You will need to add 1 2 of plywood between the 2x4 s to get the right wall thickness of 3 1 2.
To make the door header the top of the door frame cut two 2x4s to the same length as the width of the original opening and nail them securely together.
Find the height and width of your empty doorway by running a tape measure down one side then stretching it across the top.