Kitchen Faucet Add-Ons: Valves, Filtration, Dispensers, and Repair Lines
The base swap price is the line shoppers see first. The layer behind it is everything the under-sink cabinet carries beyond the faucet itself: supply lines and shut-off valves, a soap dispenser, a filtration unit or an instant hot-water dispenser, sprayer and hose lines, a deck plate, disposal of the old unit, and repair of a cabinet floor marked by an old fitting. Published 2026 figures price that layer line by line, and on a filtration project it can cost more than the faucet above it.
Orange County, CA · Updated 2026 · Costs shown as ranges — your quote will vary by installer and scope
Supply lines and shut-off valves
| Under-sink line | Published 2026 range |
|---|---|
| Shut-off valve, per valve installed | $75-$200 |
| Supply lines, per pair | priced per pair on the quote |
| Labour rate behind the layer | $45-$150 per hour |
| Base swap band, for scale | $120-$300 |
The connection layer prices as scope, not as a feature checkbox. Plumber reporting puts a shut-off valve at $75 to $200 per valve installed, and a sink carries two -- one on each supply side -- so a quote that names both carries the line twice. Supply lines price per pair on the quote, apart from the valves they meet. These figures sit on top of the base swap totals on the hub guide.
Soap dispensers, sprayer and hose lines, deck plates
| Fixture line | How it prices |
|---|---|
| Soap dispenser unit | priced per unit on the quote |
| Sprayer and hose line, pull-down formats | inside the $175-$500 type band, or per line apart |
| Deck plate | priced per plate on the quote |
| Extra hole scope | priced where the hole count changes |
These lines price in two ways: inside the unit band, where a pull-down format at $175 to $500 already carries its sprayer and hose, and as separate lines, where a dispenser or deck plate is quoted per piece. A dispenser also names its own hole in the deck, which ties this layer to the hole scope compared on the replacement vs. new installation cost guide.
Filtration units and instant hot-water dispensers
| Filtration line | Published 2026 range |
|---|---|
| Under-sink filter unit | $100-$500 |
| Filter fitting, pro line | $150-$300 |
| Reverse osmosis equipment | $250-$1,000 and above |
| Reverse osmosis fitting | $200-$600 |
| Hot-water dispenser project | $300-$600 |
The filtration layer is the largest line in this guide. Published reporting puts an under-sink filter unit at $100 to $500 with fitting at $150 to $300, and reverse osmosis equipment at $250 to $1,000 and above with fitting at $200 to $600. An instant hot-water dispenser prices as its own project at $300 to $600 in Angi add-on reporting. None of these lines appears on a plain swap quote -- the layer belongs only to projects that name it.
Old-unit removal, disposal, and cabinet-floor repair
| Closing line | How it prices |
|---|---|
| Old-unit removal | inside the $120-$300 installed band |
| Old-unit disposal | priced per unit where not included |
| Cabinet-floor repair, leak-damaged | priced per repair scope on the quote |
| Cabinet side and base patching | priced apart where not included |
The closing layer follows the condition the old fitting leaves behind. Removal sits inside the installed band in HomeGuide reporting, while disposal prices per unit where a contract does not carry it. A cabinet floor marked by a long-running drip at an old connection prices as a repair line of its own, per scope on the quote. A plain swap in a sound cabinet typically carries none of this layer beyond removal.
Neighbour lanes carry a different add-on layer
Every line here belongs to one sink fixture and the cabinet under it. A kitchen remodel prices valves, filtration, and cabinet work as part of whole-room scope, spread across the room rather than isolated to one fixture, and the pot-filler cluster carries its own valve and water-line layer for a stove fixture. The kitchen-faucet lane is the kitchen purchase where the priced layer behind a single fixture is itemized, optional, and easy to miss in a lump sum.
- Valve count named: one side or both, per valve
- Supply lines shown apart from the valves they meet
- Filtration unit and fitting priced as separate lines
- Disposal stated as carried or priced per unit
- Add-on total shown apart from the base swap price
Frequently asked questions
How much does a shut-off valve add to a faucet project?
Plumber reporting prices a shut-off valve at $75-$200 per valve installed. A sink carries two valves, one on each supply side, so a quote naming both carries the line twice, on top of the $120-$300 swap band.
What do filtration units cost as a faucet add-on?
Published reporting puts an under-sink filter unit at $100-$500 with fitting at $150-$300, and reverse osmosis equipment at $250-$1,000 and above with fitting at $200-$600. An instant hot-water dispenser prices as its own project at $300-$600.
Are soap dispensers and deck plates priced inside the unit?
It varies by quote. A pull-down band at $175-$500 already carries its sprayer and hose, while a dispenser and deck plate are commonly quoted per piece as separate lines.
What do removal and cabinet-floor repair lines cost?
Removal sits inside the $120-$300 installed band in HomeGuide reporting, and disposal prices per unit where a contract does not carry it. Repair of a leak-damaged cabinet floor prices per repair scope on the quote, apart from the faucet lines.
Do these add-ons appear on kitchen-remodel quotes?
Not in this form. A kitchen remodel spreads valves, filtration, and cabinet work across whole-room scope on its own guide, and the pot-filler cluster carries a valve layer for a stove fixture. This layer belongs to one sink fixture.