Wainscoting is essentially paneling that does not cover the whole wall. It generally is applied one third or two thirds up the wall.
Other sources advise a height of 32" to 48".
Take into consideration where it is used (chair height in living, dining, study and vanity, countertop or backsplash height in bathrooms or kitchens).
Wainscoting always needs to be looked at in conjunction with all the other trims: window sill height, casing etc. Transitions are the tricky part of wainscoting and need to be addressed when deciding on the height.
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