Lifestyle: If this is a family bathroom and several generations of the family will be using the faucets and sink, consider the ages and height of the family members. Wall units are interesting, but may not be reached by the very young or the older generation. If the individuals using the faucets are older, install an ADA appropriate type of handle, such as a lever or touch-activated faucet.
Space: Counter space often is a premium. Several space saving options are available, such as wall-mounted faucets. Shelving or a medicine cabinet over the sink may limit the height of the faucet to be used. If installing a faucet in an existing sink, note the number of holes and their configuration for purchasing a faucet set that will fit. A deck plate may be available to cover extra holes if a change is made — but check to make sure it will work.
Finishes: Coordinating the sink faucet with tub or shower sets is recommended. A variety of faucet finishes are available, and may not be the exact color from manufacturer to manufacturer, but unless directly next to each other, the slight differences should not be obvious.
Style: The architectural style of the bathroom will have an impact on the faucet design. One and two handle types are available in contemporary to traditional to colonial styles.