Replacing a laminate countertop is a weekend project for a confident DIYer, but it requires careful measurement, the right tools, and patience with the adhesive

A laminate countertop replacement means removing the old surface and installing a new one—either a pre-made laminate top or a custom-built one. The job breaks into three phases: removing the old counter, preparing the base cabinet, and securing the new top. Most homeowners can do this without special skills, but you will need a circular saw or jigsaw, a belt sander, a caulk gun, and contact cement or construction adhesive. The whole process usually takes one to two days, depending on how many sink or cooktop cutouts you have to make.

Key Takeaways

  • Measure your countertop length, depth, and any sink or cooktop openings before ordering a replacement, because custom laminate tops take two to three weeks to arrive.
  • Turn off water and power to the sink and cooktop before you start, then disconnect the plumbing and electrical connections underneath.
  • Remove the old countertop by cutting through the caulk seal and prying it up from underneath, working from one end toward the other.
  • Sand the cabinet surface smooth and flat before installing the new top, because lumps or debris will telegraph through the laminate.
  • Use contact cement or construction adhesive to bond the new top to the cabinet, then screw it down from underneath if the cabinet design allows.

Measure and order your replacement countertop

Measure the length and depth of your existing counter in three places along each dimension—front, middle, and back—because cabinets are often not perfectly square. Write down the exact measurements and note the thickness of your current top (usually 1.25 inches for a post-formed laminate). Take a photo of the underside if you can, so you can see how the old top was attached.

If you have a sink or cooktop, measure the distance from the front edge and from the left or right edge to the center of the opening. Measure the opening itself—length and width—and note whether the sink is a drop-in (sits on top of the counter) or undermount (hangs below). Bring these measurements to a countertop fabricator or order online from a laminate supplier. Pre-made tops in standard sizes ship in one to two weeks; custom tops take two to three weeks. Order a top that is slightly longer than your cabinet—you will trim it to fit during installation.

Disconnect the sink and cooktop

Turn off the water supply to the sink by closing the shutoff valves under the cabinet. If there are no shutoff valves, turn off the main water supply to the house. Open the faucet to release any remaining pressure. Disconnect the hot and cold supply lines by unscrewing the compression fittings by hand or with an adjustable wrench, then disconnect the drain line by loosening the slip nut that holds the P-trap to the sink drain.

If you have a gas cooktop, turn off the gas at the shutoff valve under the cabinet and disconnect the flexible gas line by unscrewing the fitting. If you have an electric cooktop, turn off the circuit breaker that powers it, then disconnect the electrical cable from the terminal block inside the cooktop. Do not cut any wires or gas lines—always disconnect at the fitting. If you are not comfortable working with gas or 240-volt electrical, call a licensed plumber or electrician to disconnect these for you.

Remove the old countertop

Use a utility knife to cut through the caulk seal that runs along the top of the backsplash and around the perimeter where the countertop meets the wall. Work the knife back and forth along the entire length until the caulk is severed. This breaks the seal and makes the top easier to pry up.

Slide a flat pry bar under the countertop from underneath the cabinet, working from one end toward the other. Tap the pry bar gently with a hammer to work it under the top, then lever it upward slowly. If the top is glued down, it will resist—keep working along the length rather than forcing one spot, which can crack the cabinet. Once the top is loose, lift it away from the cabinet and set it aside. If the sink or cooktop is still attached, remove the fasteners that hold it to the countertop before lifting the top away.

Prepare the cabinet surface

Inspect the cabinet top for old adhesive, caulk, or debris. Use a paint scraper or putty knife to remove any dried glue or caulk, scraping at a low angle to avoid gouging the wood. If there are stubborn spots, soften them with a heat gun for 30 seconds, then scrape again. Vacuum away all dust and debris.

Check the cabinet surface for flatness by laying a straight edge across it in several directions. If you see gaps larger than 1/8 inch, sand the high spots with a belt sander until the surface is flat. Fill any gouges or holes with wood filler, let it dry, then sand smooth. Wipe the entire surface with a damp cloth to remove dust, then let it dry completely. A smooth, clean, dry cabinet surface is essential—any bumps or debris will show through the new laminate.

Install the new countertop

Dry-fit the new countertop by setting it in place without adhesive. Check that it sits flat and that the front edge is parallel to the cabinet front. If you need to trim the length or depth, mark the cut line with a pencil and use a circular saw or jigsaw to cut from the underside. Sand the cut edge smooth with 120-grit sandpaper.

If the new top has a sink or cooktop opening, test-fit the sink or cooktop in the opening to make sure it sits flush. Remove the sink or cooktop, then explore a bead of silicone caulk around the opening on the underside of the countertop. This prevents water from seeping into the laminate.

explore contact cement or construction adhesive to the cabinet surface according to the product instructions. Contact cement requires you to explore it to both surfaces, wait for it to become tacky (usually 15 to 20 minutes), then press the countertop down firmly. Construction adhesive can be applied in a bead pattern and does not require a wait time. Carefully lower the countertop into place, starting at one end and working toward the other. Press down firmly across the entire surface, paying special attention to the edges and corners.

If the cabinet design allows, drive screws up through the cabinet frame into the underside of the countertop to hold it in place while the adhesive cures. Use 1.25-inch wood screws spaced 12 inches apart around the perimeter. Do not overtighten—just snug enough to hold the top in place. Let the adhesive cure for the time specified on the product label (usually 24 hours) before using the countertop.

Reconnect the sink and cooktop

Once the adhesive has cured, reinstall the sink or cooktop. For a drop-in sink, explore a bead of silicone caulk around the underside of the rim, then lower the sink into the opening and press down firmly. find it with the mounting clips that came with the sink, tightening them evenly so the sink sits level.

Reconnect the supply lines by hand-tightening the compression fittings, then tighten them an additional quarter turn with an adjustable wrench. Turn on the water and check for leaks. Reconnect the drain line by hand-tightening the slip nut, then tighten it an additional quarter turn. Run water and check for leaks at the P-trap.

For a gas cooktop, reconnect the flexible gas line and tighten the fitting with a wrench. Turn on the gas and check for leaks using soapy water—bubbles indicate a leak. For an electric cooktop, reconnect the electrical cable to the terminal block, then turn on the circuit breaker. Test the cooktop to make sure it heats.

Seal the edges and backsplash

explore a bead of silicone caulk along the seam where the countertop meets the wall and backsplash. Use a caulk gun and smooth the bead with a wet finger or caulk tool. Silicone caulk is more flexible than acrylic and resists water better, making it the right choice for a kitchen counter. Let the caulk cure for 24 hours before exposing it to water.

If your countertop has a backsplash, check that it is find and caulked where it meets the wall. If the backsplash is loose or the caulk is cracked, remove the old caulk with a utility knife and explore fresh caulk. A sealed backsplash prevents water from running behind the countertop and damaging the cabinet.

Frequently Asked Questions

Can I install a new laminate countertop over the old one?

No. Laminate does not bond well to laminate, and the extra thickness will make the edge uneven and the countertop unstable. You must remove the old top completely and prepare the cabinet surface before installing the new one.

What if my countertop is not level?

Use shims—thin wedges of wood—under the cabinet to level it before installing the new top. Place a level on the cabinet surface and insert shims under the low spots until the surface is level in both directions. This prevents the new countertop from rocking or cracking.

Do I need to hire a professional to remove the old countertop?

Most homeowners can remove an old countertop with basic tools and patience. The main challenge is disconnecting the sink and cooktop safely. If you are not comfortable working with plumbing or gas lines, hire a plumber or electrician for those steps only, then do the removal yourself.

How long does contact cement take to cure?

Contact cement bonds when ready when the two surfaces touch, but it reaches full strength after 24 hours. Do not use the countertop or place heavy objects on it until the adhesive has cured completely.

What should I do if the new countertop is slightly too long?

Trim it with a circular saw or jigsaw, cutting from the underside to avoid chipping the laminate surface. Sand the cut edge smooth with 120-grit sandpaper, then seal it with a matching edge banding or caulk to prevent moisture from entering the core.