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Step 1 · Planning and Layout

First, determine the exact location and dimensions of your new vanity. Obtain the manufacturer's specification sheet or measure the vanity directly. Mark the center of the vanity on the floor and transfer this mark up the wall using a level. From this centerline, mark the standard heights: the drainpipe center should be between 16-20 inches from the finished floor. The hot and cold water supply lines should be 3-4 inches above the drain, and spaced 4-6 inches apart on either side of the drain centerline. The hot water supply (left) and cold water supply (right) should be clearly marked.

Planning and Layout - How to Rough-In Plumbing for a Bathroom Vanity - Stesso