Replacing a kitchen faucet is a manageable DIY project that typically takes 30 minutes to an hour with the right tools and preparation. The process involves removing the old faucet, installing the new one, and ensuring proper connections to prevent leaks. Most guides emphasize checking sink hole compatibility before purchasing a new faucet, as this determines whether the replacement will fit correctly. The task requires basic tools like wrenches, Teflon tape, and plumber’s putty, though some installations may need specialized tools like a basin wrench for tight spaces.

Key findings from the sources:

• Preparation is critical: Verify the number of sink holes (1-4) and gather tools like adjustable wrenches, Teflon tape, and supply lines before starting ^[1][3].
• Safety first: Always turn off water valves under the sink and relieve pressure by running the faucet before disassembly ^[1][2][3].
• Common pitfalls: Leaks often occur from improperly sealed connections or misaligned supply lines; Teflon tape and careful tightening are essential ^[2][7].
• DIY feasibility: Many users report completing the task in under an hour, though tight spaces and old plumbing may add complexity ^[6][10].

Step-by-Step Kitchen Faucet Replacement Guide

Removing the Old Faucet

Before installing a new faucet, the old unit must be carefully removed to avoid damaging the sink or plumbing. Start by turning off the water supply valves located under the sink—these are typically marked for hot (left) and cold (right) water. Open the faucet to release any remaining pressure in the lines, which prevents water spray during removal ^[1][3]. Place a towel or bucket under the sink to catch drips, as residual water may escape when disconnecting lines.

Next, disconnect the supply lines from the faucet tailpieces using an adjustable wrench. If the connections are stubborn, apply penetrating oil and wait 10–15 minutes before attempting again ^[2][9]. For faucets secured with mounting nuts beneath the sink, use a basin wrench or tongue-and-groove pliers to loosen them. Some models may have clips or screws holding the faucet in place; consult the manufacturer’s instructions if unsure ^[3]. Once all connections are detached, lift the old faucet out from the top of the sink. Clean the sink surface thoroughly to remove old plumber’s putty, silicone, or debris, ensuring a smooth seal for the new faucet ^[7].

• Tools needed for removal:
• Adjustable wrench or basin wrench for tight spaces ^[9]
• Towels or bucket to catch water ^[1]
• Penetrating oil for corroded connections ^[2]
• Screwdriver (if clips or screws secure the faucet) ^[3]

Installing the New Faucet

Begin by assembling the new faucet according to the manufacturer’s instructions, as some models require attaching handles or sprayers before installation. Insert the faucet through the sink holes from the top, ensuring it aligns correctly with the sink’s drainage system. From underneath the sink, secure the faucet with the provided mounting hardware—this usually involves a locking nut, washers, and a gasket. Tighten the nut with a wrench, but avoid over-tightening, which can crack the sink or damage the faucet ^[2][5].

Connect the hot and cold supply lines to the corresponding tailpieces on the new faucet. Wrap the threads of the tailpieces with 3–4 layers of Teflon tape in a clockwise direction to create a watertight seal ^[2][7]. Hand-tighten the connections first, then use a wrench to secure them an additional half-turn—over-tightening can strip threads. If the faucet includes a sprayer or soap dispenser, connect these components to their designated lines, ensuring all hoses are untangled and properly routed ^[5].

Before finalizing the installation, turn the water supply valves back on and test the faucet for leaks. Run both hot and cold water for 30 seconds to flush out any debris in the lines, then check all connections under the sink for moisture ^[3][8]. If leaks are detected, turn off the water and re-tighten the connections or reapply Teflon tape. For persistent leaks, the issue may lie with a faulty washer or damaged supply line, requiring replacement parts ^[7].

• Critical installation steps:
• Align faucet with sink holes before securing mounting hardware ^[3]
• Use Teflon tape on all threaded connections to prevent leaks ^[2]
• Test for leaks immediately after turning water back on ^[8]
• Flush water lines to clear debris before regular use ^[3]