What is the difference between an undermount sink and a drop-in sink?
A drop-in or top mount sink, sits on top of the cutout, and does not add any additional cost to the job. An undermount sink is mounted on the bottom of the granite, revealing a polished sink cutout opening. One of the benefits to this type of sink is that it provides a smooth surface from kitchen countertop to sink. This type of cutout does include a standard fee, being that it requires additional fabrication.