Work from the finished basin
Confirm the vanity, countertop and sink before setting the faucet. A vessel basin raises the rim above the counter; an undermount basin creates a different relationship. Measure from the actual finished surfaces and use the selected spout drawing, including any drop, rather than judging only the wall connection.
Plan useful space under the outlet
The outlet needs enough room for hands and normal washing without an unnecessarily long fall into the basin. Basin shape, depth, flow and projection all influence splash. There is no one height that guarantees a good result with every sink. Assess the whole arrangement with your installer.
Check the wall and neighboring details
Confirm rough-in depth against the final wall build-up. Include the mirror, backsplash, shelves and control movement in the layout. A handle may need room that is not obvious from the front view. Do not prioritize symmetry over a workable outlet position and accessible controls.
Confirm before closing the wall
Keep the exact product reference, drawing and basin measurements together. Ask the installer to verify the proposed height and connections before tiling or plastering. Photographs of a styled bathroom can guide the appearance, but they should not be treated as installation instructions.
A common question.
Can I use the same height for a vessel and undermount sink?
Not automatically. Their rim and bowl positions differ, so the outlet and clearance need to be assessed separately.
Take the next step.
Use the bathroom faucet buying guide to put this decision into the wider room plan. Then compare bathroom faucets using the exact selected configuration and current product information.
View a relevant Vintaless product example. Check its drawings, included components and finish before deciding whether it fits your project.