Installing a new faucet takes 30 minutes. Getting the old one out is where kitchen faucet replacement earns its reputation, because you are fighting a mounting nut that has spent 15 years rusting in a dark, damp cabinet, positioned exactly where no wrench wants to go. I have removed faucets that surrendered in five minutes and one that took an hour and a half of penetrating oil, a basin wrench, and finally a hacksaw blade. This guide is built around the removal battle — the tricks, the tools, and the escalation path when the nut will not move — followed by the straightforward swap that comes after.
Before You Crawl Under: Setup That Saves Your Back
Clear the cabinet completely and put down a folded towel over the cabinet floor edge — you will be lying on it for a while. Get light in there; a headlamp beats a flashlight because both hands stay free. Then shut off the hot and cold angle stops under the sink and open the faucet to drain pressure. Test that the stops actually seal: if water keeps trickling, your shutoffs are failed and the whole-house valve goes off instead. Plan on replacing bad stops while everything is apart — $12 quarter-turn valves are cheap insurance against doing this job again.
Take a phone photo of the existing connections before touching anything. When you are reconnecting an hour later, the photo settles every “which line went where” question.
Disconnecting the Supply Lines
Supply lines crack loose with two wrenches — one holding the valve steady, one turning the nut — because twisting a corroded angle stop off the wall pipe turns a faucet swap into a plumbing emergency. If the faucet has rigid chrome supply tubes instead of braided lines, cut them with a mini tubing cutter rather than wrestling the frozen compression nuts; you are replacing the lines anyway. Old pull-out faucets also have a sprayer hose connected to a diverter nipple under the deck — disconnect it and unhook the counterweight before it snags. Keep a small bucket and rag handy; even drained lines hold a cup of water.
The Mounting Nut: Know Your Enemy
Faucets clamp to the sink with one of three arrangements: plastic wing nuts (friendly), brass or steel jamb nuts on threaded shanks (the rusty classic), or a bracket-and-stud system on newer models. The nut sits behind the sink bowl in a gap barely wider than your forearm, which is why a basin wrench — a $15-$25 T-handled tool with a spring-loaded pivoting jaw — exists. Extend the shaft up behind the bowl, let the jaw bite the nut flats, and turn the T-bar at the bottom. The jaw self-tightens as you pull. Flip the head over to switch between loosening and tightening. It is an awkward tool for the first two minutes and indispensable after.
An even better option for hex-style faucet nuts is a faucet-nut socket set (RIDGID’s EZ Change tool or a Danco faucet socket, $15-$30), which slips over the supply tubes and drives the nut with far more control than a basin wrench’s jaw.
When the Nut Will Not Move: The Escalation Path
Work through these stages in order — each one solves most of the cases the previous stage could not:
- Penetrating oil. Soak the threads with PB B’laster or Liquid Wrench, wait 15 minutes, reapply, wait again. Patience here saves every later step.
- Heat the corrosion loose. A hair dryer on the nut for several minutes expands and cracks the rust bond. No open flame under a sink — supply lines and P-traps are plastic.
- Shock it. Tap the basin wrench handle sharply with a hammer to break the bond, rather than applying slow, tool-bending force.
- Cut the faucet free. Final stage: split the nut with a hacksaw blade in a holder, an oscillating multi-tool with a metal blade, or a Dremel and cutoff wheel. Cut at an angle across one flat of the nut until it relaxes, then chisel it around. Protect the sink underside with a scrap of cardboard. The faucet is trash anyway — the sink is what you are protecting.
Plastic wing nuts that spin freely without loosening have cracked; grip the whole nut with channel-lock pliers and squeeze while turning.
Cleaning the Deck: The Step Everyone Skips
Lift the old faucet out and you will find a ring of blackened putty, mineral crust, and grime baked onto the sink. Scrape it with a plastic putty knife, dissolve the residue with a 50/50 vinegar-water soak or a Magic Eraser, and dry the deck completely. On stainless sinks, rub with the grain. This matters functionally, not just cosmetically — the new faucet’s gasket needs a flat, clean surface to seal, and any crust under the base telegraphs into a wobbly faucet. If the new faucet has a smaller footprint than the old three-hole spread, an escutcheon deck plate (usually included) covers the extra holes.
Setting the New Faucet
The modern install is genuinely easy: drop the faucet through the hole with its gasket, thread the mounting hardware from below, and hand-tighten while a helper up top keeps the faucet square to the sink edge before the final snug. Connect braided supplies hot-left, cold-right, snug plus a quarter turn — no thread tape on compression or gasketed faucet connections. Route the pull-down hose and counterweight clear of the P-trap and valves. Then remove the aerator or set the head to spray, and flush both lines for 30 seconds to clear debris before it clogs the new aerator. Full torque specs, deck-plate sealing, and first-run checks are covered in our faucet installation guide if you want the install half in the same detail as this removal half.
Special Cases That Change the Job
A few sink situations rewrite the standard playbook. Granite and quartz tops with undermount sinks give you less vertical clearance behind the bowl than a drop-in stainless sink — the basin wrench may not fit at all, which makes the faucet-nut socket set nearly mandatory. Farmhouse and apron sinks often mount the faucet through the countertop far behind a deep bowl, adding reach; a basin wrench with a telescoping shaft (Ridgid model 46753 style, $30) earns its price there. Garbage disposals block access on many double-bowl setups, and it is genuinely faster to unplug the disposal, twist it off its mounting ring, and set it in the cabinet floor for 20 minutes than to work around it. If the old faucet was plumbed with corrugated copper tubes soldered into the shutoffs — common in pre-1980 houses — plan a shutoff replacement into the job from the start rather than discovering it mid-swap.
Hole-count mismatches run both directions. Going from a two-handle three-hole faucet to a single-hole model, the included deck plate bridges the extra holes; going the other way is impossible without a new sink. Check the new faucet’s required hole diameter too — most singles want 1-3/8 inches, and some older sinks are drilled at 1-1/4, a quick fix on stainless with a step bit and an impossibility on porcelain.
Leak Check and Wrap-Up
One more habit worth adopting while the cabinet is empty: label the shutoff valves with a paint pen (hot and cold, plus the date of the faucet swap), and leave the faucet’s parts bag and manual taped inside the cabinet wall. Five years from now, when the spray hose needs a replacement part, the model number is the difference between a five-minute order and an afternoon of photo-matching faucets online.
Open the stops slowly, run hot and cold for a minute, then wipe every connection with a dry paper towel and check it against cabinet light — a weep shows on the towel before it shows on the pipe. Check again after 24 hours; compression joints occasionally seep only after cycling warm and cold. Total honest time for a kitchen faucet replacement: 60 to 90 minutes when the nut cooperates, half a Saturday when it does not. Either way it beats the $150-$350 a plumber charges for the same fight.
