Taking your measurements for a Combination House Type Door
Taking your measurements for a Single, Outswing Type Door
The most common mistake when measuring a mobile home door is to measure the door itself - this will result in an incorrect size. The correct way to measure a rear door if you don't know the rough opening is to measure the lid of the door (see photo at right). The lid is larger than the pan and is the side of the door that faces the outside of the home. The pan is inside the home. If you measure the lid, it will match the rough opening of the door.
Taking your measurements for a Storm Door
Storm doors use the same rough opening measurement of the combo door it will be installed upon. Do not measure the storm door but instead measure the jamb as if you were measuring a complete combo door.
Is my door left hand or right hand?
Go outside into the yard, turn around and face the door, whichever side the hinge is on, determines left hand or right hand. This is the same for rear doors, combo doors, and storm doors.