I have no idea if it's custom. My guess would be no. I was the photographer of the space for Canadian Architecture & Design magazine. While I know it's the home of a principle at a very well-known Toronto design firm, I'm not in a position to know all of the details of the sourcing on the space and respect the home owner's privacy with regard to asking too many questions at this juncture. Sorry, that's the best I can do.

Looks like it could be Kohler's Verity sink?