Typically unpolished holes are provided at no additional charge, Undermount sinks are typically an upgrade with varying charges, our undermount process does include cutting of the hole with a standard positive overhang (a negative overhang must be requested at initial order,). We then smooth and polish the hole, then we mount the sink to the stone with silicone, epoxy and mechanical supports. Edge pricing may vary by profile and thickness. Radius corners of tops can be included but may have additional charges as they get larger than the typical 1" radius in the same way there may be charges for radius or arched counters according to the size of the radius.
*There is a 50 square feet minimum. Being a commodity, it may be unavailable at times due to conditions beyond our control.