When figuring out how to measure for bathroom faucets, the most important measurement you need is the spacing between the holes on the sink or countertop. This isn't a challenging measurement to make, because there are only three possibilities.
If you're installing a new vanity, you'll also need the width of the countertop and the distance between the faucet holes and the backsplash. Don't forget the distances between the faucet connections and the supply valves as this is crucial information when shopping for flexible supply hoses.
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Measure for Standard Spacing
When you measure for bathroom sink faucets, you'll see two or three holes on your sink or countertop. The relevant measurement is the spacing between the centers of the outer holes. You can often identify the spacing just by looking, but if not, stretch a tape measure between them:
- 4 inches is the standard spacing for the compact centerset faucets, a single-piece faucet needing either three holes, for the hot and cold water valves and the drain popup, or two holes with no popup.
- 4, 6 or 8 inches is the standard spacing for mini-widespread bathroom faucets, which consist of three separate pieces. All are three-hole configurations, allowing for the valves and the spout.
- From 8 to 16 inches is the available spacing for bathroom widespread faucets, with three separate holes that you can install at intermediate and near-random widths if you see fit.
- The less-common wall mount faucets, useful for contemporary design or when there is no space for a faucet in the sink, come in similar configurations to deck-mounted centerset and widespread faucets.
Make Sure There's Room
If you're modifying the backsplash as part of the faucet replacement project, you'll need another measurement: the distance from the centers of the holes to the backsplash. Compare this measurement to the width of the faucet base to be sure the faucet will fit before buying it.
Ensure ADA Compliance
If you're renovating the vanity, you may not be legally bound to make it accessible to people with disabilities under the Americans with Disabilities Act, but doing so prevents future liability issues. To make the vanity ADA compliant when you measure for bathroom faucets, the top of the vanity must be no more than 34 inches above the floor, and the maximum reach from the front of the vanity to the faucet cannot exceed 20 inches.
Moreover, you cannot require people to reach higher than 44 inches to access the faucet. Keep these numbers in mind when constructing the vanity and measuring for your faucets, especially wall-mounted ones.
Flexible Hose Length
After you've installed the faucet, you need flexible hoses to connect it to the water supply, and these come in a variety of lengths. Prevent repeated trips to the hardware store by measuring the distance from each faucet connector to its corresponding shut-off valve, then add about 2 or 3 inches.
Purchase the hose with the length closest to that measurement. Just as you don't want to buy a hose that's too short, you don't want one so long that it curls around under the sink claiming valuable shelf space.
Don't forget to check the sizes of the connectors on the faucet and on the valve to make sure the flexible hose connectors conform. Most are either 1/2-inch pipe thread or 3/8-inch compression fittings.