Answer for USA
The NEC requires that required outlets be installed anywhere from 5 feet high on the wall to as much as 18 inches from the wall on the floor. However, they are typically placed from 12-18 inches high on the wall. This is purely arbitrary, depending on what you think looks best and how accessible you want them to be.
It is important that you note I said this is what is required for required outlets. You can place an outlet anywhere you wish, except face-up in a counter. Just if it does not fall within the measurements I gave above the outlet doesn't qualify for what is a required outlet.
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Before you do any work yourself
on circuits, equipment or appliances,
ensure the circuit is, in fact, OFF.
IF YOU ARE NOT ALREADY SURE YOU CAN DO THIS JOB
SAFELY AND COMPETENTLY
REFER THIS WORK TO QUALIFIED PROFESSIONALS.
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Well, i usually measure 20 inches above floor height.
That is a standard i use, and for switches i measure 52 inches.
for all the houses and buildings i have installed i applied this.
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Standard heights on receptacles is 12 inches (300 mm) to center and on switches 48 inches (1200 mm) to center. Counter plugs 43 (1090 mm) inches to center.