if not major reno, the difference is minor, only a few hundred diff (max).
if major, jus point to contractor, they measure for u la, easy to quote.

A competent contractor can calculate easily and tell u how much is the estimated difference,
unless u are unsure of where your wet work will end up.

If your contractor cannot give u the quote, means he is fooling and fishing, and see if he can
chop u vegetable head lo..