Referring to door height.
Standard door hinge height uk.
Many hinges per door.
For example if the door is 1 3 8 inches thick and the width is no more than 32 inches the hinge height is 3 1 2 inches.
The third hinge is centered between the top and bottom hinges.
Opening heights 3 0 through 4 11 15 16 centered in door height not frame.
For a standard internal door its door lock is normally 42 from the floor to the centre of the latch.
As a general rule you will want to use 1 hinge per every 30 inches of door or fraction thereof.
Fire door standard sizes.
This is the most common height for passage doors that lead from one room to another.
All standard bored locks ansi 115 2 161 61l type for mortise lock ansi 115 1 86 type all locations must be altered 3 8 lower and standard strike asa type.
However if the door is between 32 inches and 36 inches the leaf height of the hinges must be increased to 4 inches to handle the increased weight.
When a door starts to sag and hang crooked it always does so from the top so the upper part of the doorknob side is where it will start to catch.
If it is a bigger two leaf door you may need 4 hinges.
The main difference being an increased door height of 2040mm and door thickness of 40mm.
Doors over 60 inches but not over 90 inches need to use 3 hinges.
How to determine hinge spacing on a door.
Standard interior door height is 80 inches.
2040 x 526 626 726 826 926 x 40mm.
Doors up to 60 inches need 2 hinges.