When you enter the bathroom you press a locking button on the inside of the knob or lever.
How to install a bathroom door lock.
The most widely used type of bathroom door lock is a knob or lever lock with a built in privacy function.
Open the door and stand with your back to the hinges.
Some blank doors have a specific swing.
Then hold either the door lock or door bolt against the edge of the door.
Hand thread the screws then tighten them using a screwdriver or power drill.
Measure the centre point of the door and draw a vertical line between the two marked points.
If you re installing a pre hung door make sure you get the correct swing determined by the placement of the hinges and doorknob.
The door will open freely at all times when the bathroom in unoccupied.
A simple walk through video on how to fit a bathroom lock to your internal door.
To begin place a door stop to ensure that the door is locked in place.
Attach the interior part of the deadbolt lock by inserting the two provided long screws through the interior plate the two screw holes in the bolt and into the exterior side of the lock.
If the doorknob is on the left you need a left handed door.
The door will remain locked until you turn the knob from the inside.
If the knob is to the right select a right handed door.
This video will show you how to replace a lockable bedroom bathroom doorknob or door handle.