a kitchen island with a built-in sink
Photo: Pete Bleyer
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Fixtures and Appliances: Sinks

Whether it's big, to handle full-on dinner cleanup, or small, for rinsing veggies and wine glasses, your sink needs a drain that's vented. With no wall to hide the vent pipe, island sinks can be vented either by running the pipe under the floor 
and connecting it to the nearest existing vent or by mounting an air-admittance valve on the drain under the sink. These valves are simpler to connect, but check local building codes; some municipalities don't allow them.
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