The depth of a kitchen island with a sink can vary depending on your needs and available space. However, a common depth for a kitchen island with a sink is around 36 inches (91.4 cm). This depth provides enough room for the sink and allows for comfortable use while also leaving space for countertop workspace on either side of the sink.
Keep in mind that if you have specific requirements or preferences, you may choose a different depth. Some people opt for a slightly larger or smaller depth based on their individual needs and the size of the kitchen.
Before finalizing the depth of your kitchen island, consider factors such as the size of the sink, the clearance required around the sink for comfortable usage, and any additional features you might want to incorporate into the island's design. Also, adhere to local building codes and regulations when planning the dimensions of your kitchen island with a sink.