Most kitchen faucet returns happen for the same reasons: the faucet needs a different number of holes, the handle hits the backsplash, the spout is too tall for the window or too short to reach the drain, or the supply connections do not match. Ten minutes with a tape measure and a flashlight under the sink avoids all of them. This guide lists what to measure, how to compare it with a manufacturer’s specification sheet and what to know before installing. It is general guidance: always follow the installation instructions for your faucet and local plumbing codes, and hire a licensed plumber when in doubt.
The measurement checklist
| Measure | How | Compare with spec sheet item |
|---|---|---|
| Number of holes | Count holes in the sink deck or counter, including any used by a soap dispenser, side spray, air gap or filter tap | “Mounting holes” (for example “one, two, three or four hole mount”) |
| Hole diameter | Measure across each hole at its widest point | “Hole size” (often 1-3/8 in / 35 mm) |
| Hole spacing | Measure centre to centre between the outer holes of a three-hole sink | “Centers” (for example 8 in / 203 mm with deck plate) |
| Deck thickness | Measure the sink or counter thickness at the hole, from underneath | “Max. deck thickness” |
| Clearance behind | Distance from the centre of the faucet hole to the backsplash or wall | “Clearance to back splash” and handle swing |
| Height above | Distance from the deck to the underside of cabinets, a shelf or the window sill | Overall faucet height and height with the handle open |
| Spout reach | Distance from the faucet hole to the centre of the sink bowl or drain | “Spout reach” |
| Supply connections | Look at the shut-off valve outlets under the sink | Supply line size and type (for example 3/8 in compression) |
| Space under the sink | Check room for a pull-down hose weight, a battery box (touch faucets) or a filter | Hose length, control box size |
Reading a specification sheet: a worked example
Delta’s specification sheet for one single-handle pull-down faucet lists:
- One, two, three or four hole mounting, with an optional deck plate included.
- Hole size of 1-3/8 in (35 mm).
- Maximum deck thickness of 2-1/2 in (64 mm).
- A minimum clearance to the backsplash of 2-1/2 in (64 mm).
- 8 in (203 mm) centres for the deck plate on three-hole sinks.
- 3/8 in compression fittings, with 3/8 in O.D. supply lines.
- A maximum flow of 1.8 gpm at 60 psi.
Every model differs, so repeat this comparison for each faucet you consider. More on holes and plates is in sink hole configurations and on measuring in faucet measurements.
Hole configurations
| Holes | Fits | Notes |
|---|---|---|
| 1 | Single-handle faucets (pull-down, pull-out, touch) | Use any spare hole for a soap dispenser, air gap or filter tap |
| 2 | Faucet plus side spray, soap dispenser or filter tap | Check that the second item fits the spacing |
| 3 | Two-handle faucets; single-handle with a deck plate | Measure centre-to-centre spacing |
| 4 | Faucet plus side spray or accessory; bridge faucets with spray | Plan what goes in each hole |
If you have more holes than the new faucet needs, a deck plate or accessories can cover them. If you need more holes than you have, adding holes to stone or composite sinks and counters is a job for the fabricator or a professional with the right tools.
Clearance and splash
A tall pull-down spout can hit a low window, a shelf or upper cabinets, and a lever handle can hit the backsplash when pushed fully back. Check both the faucet height and the handle’s swing. Spout reach matters too: if the water lands near the back of a deep bowl, it splashes; if it lands on the drain of a double-bowl sink, it may not reach the second bowl. A swivel range of 360 degrees, listed on some spec sheets, helps with double bowls.
Deck-mount installation overview
Exact steps vary by faucet; follow the manufacturer’s instructions. The general sequence for a deck-mount faucet:
- Clear the cabinet, put a towel and bucket under the sink, and turn off both shut-off valves.
- Open the faucet to relieve pressure, then disconnect the supply lines and remove the old mounting hardware.
- Clean the deck where the new faucet will sit.
- Fit the deck plate or gasket, feed the faucet through the hole and secure it from below with the supplied mounting hardware.
- For pull-down and pull-out faucets, connect the spray hose and attach the counterweight at the position the instructions specify.
- Connect supply lines to the shut-off valves, hand-tight plus the turn the instructions specify; do not overtighten compression fittings.
- Turn the water on slowly, check every connection for drips, then remove the aerator or spray head as instructed and flush the lines.
See deck-mount installation. Wall-mount faucets need valves and supply pipes inside the wall; see wall-mount installation.
Maintenance after installation
- Clean the aerator regularly. The EPA recommends cleaning the faucet screen because sediment, including lead particles in some homes, can collect there.
- Fix drips promptly. The EPA estimates a faucet dripping once per second can waste more than 3,000 gallons a year; worn washers and gaskets are a frequent cause in older faucets.
- Check under the sink for slow leaks at supply connections and the spray hose, especially in the first weeks.
- Clean the finish gently with the method the manufacturer recommends; see faucet finishes compared.
Routine care is covered in faucet maintenance.
Water quality after replacing a faucet
New faucets sold in the U.S. must be certified lead free (the EPA’s definition is a weighted average of no more than 0.25% lead on wetted surfaces). Older faucets and plumbing can contain more lead. The EPA advises using cold water for drinking and cooking, flushing pipes before drinking if water has been sitting, and testing water if you are concerned, because lead cannot be seen, tasted or smelled.
When to call a plumber
- Shut-off valves are missing, stuck or leaking.
- The supply pipes are corroded, or you find signs of an existing leak or water damage.
- You need new holes in stone or composite, or a wall-mount installation.
- Local codes require permits or specific fixtures, such as an air gap for the dishwasher.
Next, compare types in kitchen faucet types explained or follow the full process in how to choose a kitchen faucet. All installation guides are under Installation and Compatibility.
