How to Replace a Kitchen Sink

Kitchen sinks are the workhorses of the home, but after years of hard water and heavy use, their finish dulls and their seals begin to fail. Replacing a sink is a transformative project that immediately elevates the entire kitchen. A successful installation relies more on a clean, dry surface and a steady hand with the sealant than on complex mechanical skill. You are aiming for a watertight seal that prevents water from ever reaching the structural core of your countertop. When done well, the sink sits perfectly flush against the counter, the faucet hardware is rock solid, and the plumbing connections underneath are drip-free. Take your time with the removal phase to avoid damaging your countertops, and you will find that setting the new basin is a satisfyingly straightforward process.

  1. Drain and Disconnect Everything. Shut off the water valves under the sink and open the faucet to relieve pressure. Disconnect the supply lines, drain pipe, and garbage disposal wiring, using a bucket to catch any residual water in the P-trap.
  2. Loosen All Mounting Clips. Reach under the rim of the sink to locate the mounting clips. Use a screwdriver to loosen the screws, rotate the clips to clear the sink flange, and remove them completely.
  3. Break the Seal Carefully. Carefully run a utility knife around the perimeter of the sink to slice through the old silicone or caulk. Once the bond is broken, use a flat-head screwdriver or a thin pry bar to lift the sink edge slightly.
  4. Strip the Surface Down. Scrape all remaining old adhesive off the countertop using a plastic scraper. Wipe the area thoroughly with denatured alcohol to remove every trace of grease, residue, or old sealant.
  5. Lay Down a Continuous Bead. Apply a generous, continuous bead of 100% silicone sealant around the perimeter of the countertop cutout. Do not leave any gaps, as this is your primary defense against water damage.
  6. Seat and Tighten Symmetrically. Lower the new sink into the cutout and press down firmly to spread the sealant. Reinstall the mounting clips from underneath and tighten them until the sink is held snugly in place.
  7. Reconnect and Test for Leaks. Reattach the faucet, supply lines, and the drain assembly to the new sink basin. Once the silicone has cured for the recommended time, slowly turn the water valves back on and check for leaks.