Most people place them roughly six to twelve inches above the height of the door handle.
Door lock rail height.
Installers typically drill the hole centered 36 inches above the floor if not specifically instructed to do so differently.
Access doors or gates in barrier walls and fences protecting pools spas and hot tubs shall be permitted to have operable parts of the release of latch on self latching devices at 54 inches.
Door handles pulls latches locks and other operating devices shall be installed 34 inches 864 mm minimum and 48 inches 1219 mm maximum above the finished floor.
The lock strike centerline should be 40 5 16 from the bottom of the frame with the lock in relation to the strike.
Exceptions to the rule include doors that provide egress into swimming pools or other water features.
According to ansi specifications for cylindrical or mortise locks.
Most homeowners split the difference and install it roughly 44 inches from the floor.
The deadbolt strike centerline should be 48 from the bottom of the frame.
Door handles pulls latches locks and other operating devices shall be installed 34 inches 864 mm minimum and 48 inches 1219 mm maximum above the finished floor.
The international building code has established doorknob height between 34 and 48 inches above a finished floor.
Locks used only for security purposes and not used for normal opera tion are permitted at any height.
Given that most contractors install the doorknob around 36 inches from the floor a deadbolt should be positioned somewhere around 42 inches to 46 inches off the floor.