How to build a greenhouse
STEP 6. The doors
Make two doors as per the dimensions given in the drawing - the front door and the back door.
Make the doors 3/4" (20 mm) smaller than the opening.
Use 1 1/2" x 1 1/2" (45 mm x 45 mm) stock for the stiles (upright side pieces), and use 1 1/2" x 3 1/2" (90 mm x 45 mm) stock for the three horizontal rails.
Make the door frames up on a flat surface. Ensure the frames are square and then nail the gussets in place on both sides of the doors.
Hinge the doors in place and fit handles or padbolts of your choice.