Match your faucet's spout to your bathroom or your kitchen. Choose 6-inch or 8-inch spouts for bathrooms, 12-inch to 14-inch curved spouts for your kitchen.
Measure the space between the sink's pipe holes, and match them to either a mini-spread or a wide-spread faucet. Mini-spread faucets, which work best in bathrooms, have a 4-inch space between the spout and the cold and hot water handles. Wide-spread faucets work best in kitchens and have an 8-inch space between the spout and the handles.
Match your bathroom trim and appliances to one of three primary styles: modern, Victorian or country. Modern faucets can have a sleek squarish or round style, they often feature shiny chrome or burnished metal with a minimalist or plain appearance. Victorian sinks have an 8-inch to 10-inch stainless steel sloping neck, with ornate knobs and spouts. Country sinks often mimic a rustic, water-well style or have thick round features, and they can have a brass or burnished metal construction.
Match the height of the spout to your sink's basin and to your washing needs by maintaining a 1:3 ratio between spout height and basin width, where the spout's length equals one-third of the basin's width. For instance, a 6-inch spout will match an 18-inch wide basin while a 10-inch or 12-inch spout fits best in a 30-inch or 36-inch basin.
Compare the turning radius of the faucet's water handles, and look for a quarter-turn or half-turn radius. A quarter-turn handle allows one-fourth of a revolution when turning the water from off to full-flow, while a half-turn radius allows half a rotation. Quarter-turn faucets fit a small kitchen or bathroom while a half-turn radius works better in a kitchen sink.
Compare prices. Three-hole bathroom sinks cost $59 to $299, while three-hole kitchen sinks cost $89 to $699 (as of 2010).
Compare warranties. Expect a five-year warranty on low quality sinks and a 10-year or lifetime warranty on faucets from companies such as Moen, Fisher, Keidel or Kohler.