Basic Faucet Replacement

Why this matters

Faucet replacement is one of the most common handyman service calls: customers buy faucets from home centers and want them installed for a moderate labor on top of the moderate amount faucet cost. The work is straightforward when the existing installation is straightforward, and challenging when corrosion, tight space, or non-standard fittings complicate it. A handyman who can replace a faucet cleanly in 60 to 90 minutes (vs the customer's 4 to 6 hour DIY attempt) commands the labor premium with confidence.

When to perform

• Customer is replacing fixture (cosmetic or functional update)
• Existing faucet leaking or failed
• Customer purchased new faucet, needs install
• Mismatch between current faucet and remodel style

Pre-installation checks

Before quoting:

• Verify the new faucet's hole count matches the existing sink:
  • 1-hole faucet (single-handle, no spread)
  • 2-hole faucet (one for spout, one for handle)
  • 3-hole faucet (8-inch standard widespread)
  • 4-hole faucet (3-hole plus sprayer)
• If hole count doesn't match, deck plate (escutcheon) may bridge the gap, or sink replacement is needed
• Verify shut-off valves work (turn them; if stuck, replace as part of the job)
• Verify supply line type (compression vs flex)

Tools

• Adjustable wrench
• Basin wrench (for tight space under sink)
• Channel locks
• Phillips and flat screwdrivers
• Plumber's putty or silicone caulk
• Teflon tape
• Bucket (for residual water)
• Towels
• Flashlight
• Phone with camera (for under-sink work)

Materials

• New faucet (customer-supplied or selected)
• New supply lines (often included with faucet; verify compatibility)
• New shut-off valves (if existing fail or you decide to upgrade)
• Plumber's putty or silicone caulk
• Teflon tape

Procedure for typical kitchen faucet replacement

Step 1: Disconnect water supply

• Locate the hot and cold shut-off valves under the sink
• Close both
• Open the faucet to verify water is off
• Disconnect supply lines from the faucet (use adjustable wrench)
• Catch any water with a bucket

If the shut-off valves don't turn or leak:

• Note the issue
• Discuss with customer (additional cost to replace valves)
• Address valves before continuing if needed

Step 2: Remove existing faucet

For modern faucets:

• Remove mounting nut from underneath the sink (basin wrench typically required for the tight space)
• Older mounting hardware varies (threaded posts, clip systems)
• Lift faucet out from above

If the faucet is stuck due to mineral buildup:

• Apply penetrating oil to mounting threads
• Use channel locks for better grip
• For stuck faucets, removal can take 30 to 60 minutes alone

Step 3: Clean the sink area

• Remove old plumber's putty or sealant from around the sink hole(s)
• Wipe area clean
• Verify the holes are clean for the new faucet

Step 4: Install new faucet

For a typical single-hole kitchen faucet:

• Apply plumber's putty (or silicone) around the base of the faucet (or apply gasket if provided)
• Drop the faucet through the sink hole
• From underneath, install the mounting nut or plate
• Tighten gradually until firm; don't over-tighten

For a 3-hole faucet (widespread):

• Separate components (spout body, two handles)
• Install each component through its respective hole
• Connect handles to spout body via the under-sink connector tube

For a faucet with a deck plate:

• Install deck plate first (bridges multiple holes)
• Install faucet through deck plate

Step 5: Connect supply lines

• Connect cold supply line to cold side of faucet
• Connect hot supply line to hot side of faucet
• Apply teflon tape to threaded connections
• Tighten connections; hand tight plus 1/4 to 1/2 turn

For shut-off valves with compression fittings:

• Pre-existing fittings should still seal
• For new supply lines, may need new compression ferrules

Step 6: Install accessories

For pull-down or pull-out faucets:

• Install the spray hose
• Verify the weight on the hose (allows hose to retract)

For sprayer attachments (older 4-hole):

• Connect sprayer hose to faucet body

For dishwasher / disposal connections:

• Verify these are functional after faucet install
• Sometimes faucet install disrupts these

Step 7: Test for leaks

• Slowly open the shut-off valves
• Verify water flows from spout when faucet is opened
• Check all connections (under sink) for leaks
• Check faucet base (above sink) for leaks
• Tighten any leaking connections (typically 1/4 turn more)

Step 8: Clean up

• Wipe up any water
• Clean the sink and counter
• Verify all components are properly attached
• Test sprayer / pull-down repeatedly

Special situations

Bathroom faucet (similar but simpler)

Most bathroom faucets are 8-inch widespread or 4-inch centerset:

• 4-inch centerset: 3 connection points on a single base
• 8-inch widespread: 3 separate components (spout + 2 handles)

Otherwise similar procedure.

Vessel sink faucet

• Tall vessel-style spout
• Installation similar but height matters; verify height fits the sink

Wall-mounted faucet

• Different installation method; mounted to wall behind sink
• More complex; not typical handyman

Tub / shower faucet

• More complex; requires accessing wall
• Different work; consider plumber referral

Hands-free / sensor faucet

• Battery or AC powered
• Additional wiring or battery placement
• Manufacturer-specific installation

Common failure modes during install

Faucet leaks at base

• Mounting nut not tight
• Plumber's putty not applied
• Gasket not seated
• Solution: re-do the seal

Supply lines leak at connection

• Insufficient teflon tape
• Cross-threading
• Damaged threads
• Solution: re-do the connection

Faucet doesn't flow

• Air in lines (open faucet; let water purge)
• Aerator blocked (clean or replace)
• Supply line connected wrong way (rare)
• Shut-off valve not fully open

Hot and cold reversed

• Customer reports cold from hot tap
• Supply lines connected wrong way
• Swap supply lines

Spray head retraction issues

• Weight too light or too heavy
• Hose tangled
• Adjust weight; clear obstruction

Old supply line considerations

If existing supply lines are:

• Hard chrome or copper: typically reusable, but check for kinks
• Flexible braided: typically replace as part of faucet install (cheap)
• Plastic flex: replace; old plastic supplies fail

A new faucet typically includes new supply lines.

Shut-off valve replacement

If shut-off valves are stuck or leaking:

• Turn off main water supply
• Cut existing valve (often soldered to pipe)
• Install new valve (compression or sweat)
• Test before reinstalling supply lines

Compression valves are easier for handyman work; no soldering needed.

Customer expectations

References

• IPC 2021, Chapter 6 (Water Supply).
• UPC 2021, Section 605.
• ANSI/NSF 61 (Drinking Water System Components).
• Manufacturer literature: Moen, Delta, Kohler, Pfister, American Standard.
• Manuall internal: Plumbing Install Faucet, Universal Common Building Materials.