By Claire WhitakerUpdated November 2026
Changing a kitchen sink is a manageable weekend job if you work in the right order. You will disconnect the old basin and its supply lines, set the new sink into the counter, and connect the drain and water feeds so they seal without leaking. Most of the work is in the disconnecting and the prep, not the final install.
Prepare the Space and Shut Off Water
Clear everything out from under the sink and lay down a towel or old blanket to protect the cabinet floor. Turn off the hot and cold shutoff valves under the sink, then run the faucet until the flow stops completely. If the valves are stuck or do not stop the flow, shut off the main water supply to the house before you go further.
Shopping for one? See our guide: 6 Best Sink Strainers for Kitchen Sink (2026): Expert Picks.
Remove the Old Sink and Plumbing
Start by disconnecting the faucet supply lines from the shutoff valves, then loosen the drain assembly. A basin wrench helps reach the mounting nuts on the underside of the sink rim. Expect old putty, caulk or adhesive to be stubborn, so work a plastic putty knife around the perimeter before lifting the sink out. Keep the drain parts you remove in one place so you can compare them against replacements.
Check the Cabinet and Counter
With the sink out, inspect the cabinet floor and the underside of the counter for water damage or soft wood. Dry any damp areas and fix soft spots before the new sink goes in. Measure the new sink’s cutout requirements against the existing opening; a mismatch of even half an inch can make installation far harder.
Install the New Sink and Drain
Set the new sink in the opening and check that it sits level and square. Apply a bead of plumber’s putty or a silicone sealant to the rim (follow the sink manufacturer’s instructions for which to use), then secure the mounting clips or brackets underneath. Tighten them evenly so the sink does not warp the rim. Next, assemble the drain: fit the strainer into the basin, add the gasket and locknut below, and connect the tailpiece and trap. Hand-tighten the slip nuts first, then give them a quarter turn with pliers, taking care not to crack plastic parts.
Connect the Faucet and Water Lines
Mount the faucet according to its instructions, then attach the supply lines to the shutoff valves. Use new supply lines if the old ones are cracked or more than a few years old. Open the shutoff valves slowly, then check every joint for drips while the water is running.
Common mistakes
- Skipping the shutoff check. Water left in the lines can flood the cabinet when you loosen a fitting.
- Overtightening plastic drain nuts, which can crack the slip joint.
- Forgetting the gasket between the strainer and basin, which leads to leaks at the drain.
- Reusing old putty or caulk on a new sink. Clean the surface and start fresh.
- Running water too soon. Test for leaks at low pressure first and watch joints for at least ten minutes.
Recommended gear
- Basin wrench: reaches mounting nuts in tight cabinet space that a standard wrench cannot. View on Amazon
- Plumber’s putty: creates a watertight seal under the strainer flange and rim. View on Amazon
- Braided stainless supply lines: replace aging flexible hoses and resist bursting better than rubber. View on Amazon
For more on specific parts, see Parts of Kitchen Sink: 7 Best Drain Kits and Strainers Compared and Kitchen Sink Drain Components: 7 Parts Explained and How They Fit Together. If you are still choosing a replacement, Kitchen Sink by Size: How to Choose the Right Dimensions (2026) covers how to match the cutout.
FAQ
Can I change a kitchen sink without a plumber?
Yes, most homeowners with basic hand tools can handle a straightforward swap of the same size and type. Consult a licensed plumber if you find corroded shutoff valves, damaged supply pipes or water damage under the cabinet.
How long does changing a kitchen sink take?
A simple replacement in a standard cabinet often takes a few hours, though removing old, stuck putty can add time. Plan for extra time if the countertop must be cut or the sink size changes.
Do I need to replace the faucet when I change the sink?
Not always, but check that the faucet’s mounting holes match the new sink or deck. If they do not line up, you will need a faucet that fits the new configuration.
Conclusion
Shut off the water, remove the old sink carefully, and set the new one level before connecting the drain and supply lines. Test every joint slowly and check for drips before you close the cabinet. With the right order and a few good tools, changing a kitchen sink is a job you can finish in one session.
Ready to choose one?
About Claire Whitaker
Claire Whitaker is part of our editorial team and reviews and edits our kitchen faucets & sinks guides, checking product details against manufacturer specifications and owner feedback.
