A kitchen faucet installation that isn't done right leaks under the sink — slowly, undetected, until the cabinet floor is warped and the bottom shelf is damaged. STL Plumbing Pros installs kitchen faucets with the shutoff valve and supply line assessment that prevents post-installation leaks: we test valve closure, install new braided stainless supply lines, and confirm every connection before we leave. Supply and install or install-only. Same-day available.
When Do You Need a New Kitchen Faucet?
Style upgrade — replacing chrome or builder-grade with brushed nickel, matte black, or a pull-down configuration.
Pull-down functionality — adding pull-down or pull-out capability where only a standard faucet existed.
Hose failure on existing pull-down — when the spray hose is cracked or kinked beyond repair.
Faucet body corrosion — chrome peeling, visible corrosion at the base, or porcelain handle caps cracked.
Renovation or countertop replacement — new countertop or sink requiring a new faucet.
Adding a filtered water dispenser or soap dispenser — requires an additional hole in the sink deck.
Selecting a Kitchen Faucet — What to Confirm First
Count the sink holes
Standard kitchen sinks have one, two, three, or four holes. A faucet deck plate can cover extra holes if the new faucet uses fewer than the sink has.
Confirm sink deck clearance
Pull-down faucets with a tall neck require adequate clearance between the faucet and overhead cabinets. Measure from the sink deck to the bottom of the upper cabinet before selecting a tall-neck faucet.
Confirm supply line connection type
Most US kitchen faucets use ⅜-inch compression or ⅜-inch push-fit supply connections. Some European brands use different thread specifications — we confirm compatibility before installation.
Shutoff valve condition
Kitchen shutoff valves under the sink in pre-1980 St. Louis homes are often gate valves or compression valves that haven't been operated in decades. A valve that won't close fully means the water supply cannot be isolated — valve replacement is a prerequisite.
Pull-down faucets require adequate hose clearance inside the cabinet. If the garbage disposal is mounted high or there is a water filter system, the pull-down hose may not retract freely. We assess cabinet interior before recommending a pull-down model.
Our Installation Process
Assess Holes, Valves, and Cabinet Interior
Confirm sink hole count and configuration, test shutoff valve closure, check cabinet interior for obstructions to pull-down hose clearance, assess supply line condition.
Remove Old Faucet
Shut off supply, disconnect supply lines, loosen mounting hardware from below (often requires a basin wrench), remove faucet body, clean the sink deck surface.
Install New Faucet and Test
Install per manufacturer instructions — mounting plate, faucet body, supply line connections. Restore supply at full pressure. Test stream flow, spray mode, pull-down retraction, and check for leaks.
What Does Kitchen Faucet Installation Cost?
| Service | Price | Details |
|---|---|---|
| Install-only (customer-supplied faucet) | $175–$275 | Includes old faucet removal, new supply lines, installation, and full function test. |
| Supply and install (we provide the faucet) | $350–$700 | Mid-range single-handle or pull-down faucet including installation. |
| Shutoff valve replacement | $125–$250/valve | Frequently needed in pre-1980 St. Louis homes. |
| Sink hole modification | $75–$150 | Hole drilling in stainless steel for soap dispenser or filtered water faucet. |
| Soap dispenser or filtered water add-on | $100–$200 | Installed alongside the main faucet replacement. |
Why Choose STL Plumbing Pros?
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Shutoff Valve Tested Before Every Installation
We close the shutoff valves before the old faucet comes out — not after. A valve that doesn't close fully in a pre-1980 St. Louis home requires replacement before the faucet can be swapped.
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New Supply Lines — Always
We replace the supply lines on every kitchen faucet installation. Reusing existing lines saves $30–$50 and creates a leak risk at every disturbed connection.
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Pull-Down Hose Clearance Assessed
We check the cabinet interior before recommending a pull-down model — garbage disposal position, water filter, drain configuration. A pull-down with a hose that can't retract is a problem on day one.
What Our Customers Say
"Replaced a chrome two-handle with a matte black pull-down. Plumber confirmed the sink holes, checked cabinet clearance for the pull-down hose, and installed in under 90 minutes. Supply lines replaced. No leaks, hose retracts perfectly."
"Kitchen shutoff valves were original from the 1960s — plumber caught it when they tried to close them. Replaced both valves and the faucet in the same visit. Really appreciate that it was identified before it was a problem."
"Upgraded to a commercial-style pull-down. Plumber brought two options that fit my sink configuration, I chose one, it was installed and tested same day. Old faucet hauled away."
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Ready for Kitchen Faucet Installation?
Call now for same-day service or request a free quote.
314-237-0332