Because corners and walls aren’t always square, particularly in older houses, take multiple measurements for each surface and ALWAYS used the smallest.
ALL measurements to be in mm.
Also measure and show other items which are not going to be moved such as:
The position of the stop tap is shown so that the access to is isn’t restricted once the kitchen has been installed.
Notice how the boiler measurements have been shown, but the distance from the corner should also be noted. i.e. 50mm
Also measure and show other items which are not going to be moved such as:
How to measure your room
Diagram A
Diagram B
Example of elevation measurements
Example of birds eye measurements