Get Accurate Plumbing Cutout Measurements When a Corner Cabinet Meets an Out-of-Square Wall
Corners are almost never a true 90 degrees — usually because of drywall mud buildup or framing tolerance — so measuring straight from the corner to your plumbing centerlines puts the holes in the wrong place. Find the actual gap first, shift your reference line by that amount, then measure the plumbing holes from the corrected line.