Lauren HollandBy Lauren Holland

Updated November 2026

Replacing laminate kitchen countertops means removing the old top, measuring carefully, and installing a new surface that fits your cabinets and sink cutout. Done in the right order, it is a manageable weekend project for a handy homeowner. The steps below cover assessment, removal, measuring, and installation, along with the mistakes that cause the most trouble.

Assess the Cabinets and Choose a Replacement Material

Before you order anything, check whether the base cabinets are sound. Press along the top edges and inside the corners for soft or swollen particleboard, since moisture from a leaking sink often hides there. If the boxes are solid, the new top only needs to sit on them. If not, plan to repair or replace the affected boxes first.

Shopping for one? See our guide: 6 Best Products to Install Laminate Kitchen Countertops (2026).

Next, pick a material. Post-formed laminate is the simplest swap because it matches the existing profile. Solid surface, quartz, and wood each need slightly different support and edge work. If you want a budget-friendly update without a full replacement, see Paint Laminate Kitchen Countertops: A Step-by-Step Guide That Works, though painting is a cosmetic fix rather than a true replacement. For a comparison of surfaces, Types of Kitchen Countertops: Materials, Costs and Care Compared lays out the tradeoffs.

Remove the Old Countertop Safely

  1. Shut off the water supply to the sink and disconnect the supply lines and drain trap.
  2. Disconnect the dishwasher, range hood, or any other appliance that sits against the top.
  3. Remove the sink clips or caulk seal, then lift the sink out.
  4. Unscrew the countertop from below. Most tops are fastened through corner brackets or blocks screwed up through the cabinet frame.
  5. Cut through any caulk or adhesive at the wall and backsplash joint with a utility knife.
  6. Lift the top off with a helper. Laminate is heavy and the particleboard core can snap if flexed.

Wear eye protection and a dust mask. Old particleboard tops may contain formaldehyde-based binders, so ventilate the room and check local disposal rules before hauling anything out. If you are unsure about gas lines or electrical work near the range, consult a licensed professional.

Measure, Order, and Install the New Top

Measure the length of each run at the back edge, where the wall is typically the least straight. Record the depth at front and back, the position of the sink cutout, and any cooktop or outlet locations. Most standard base cabinets are 24 inches deep, and a finished top usually overhangs the front by about 1 inch. Add an inch or two of length if you plan to trim to fit.

Dry-Fit and Secure the Top

Set the new top on the cabinets without adhesive and check the reveal along the wall and the overhang at the front. Mark the sink opening using the template supplied with the sink, then cut it with a jigsaw fitted with a fine-tooth blade. Drill pilot holes before cutting to prevent chipping. Once everything fits, attach the top with corner brackets or screws driven up from below, and seal the backsplash joint with a flexible silicone caulk.

Measurement What to Record
Run length Back edge, wall to end, at each wall point
Depth Front and back of cabinet run
Sink cutout Distance from walls and front edge
Appliance gaps Dishwasher, range, and corner clearances

Common Mistakes

  • Measuring only once. Check every dimension twice before cutting.
  • Skipping the cabinet check. Installing a new top over rotted boxes creates a bigger job later.
  • Forgetting the overhang. An uneven front edge looks unfinished.
  • Cutting the sink hole before dry-fitting. Confirm the sink position first.
  • Using rigid caulk at the wall. Flexible sealant handles minor movement better.
  • A jigsaw with a fine-tooth blade for clean sink cutouts in laminate and solid surface. View on Amazon
  • Flexible silicone sealant for the backsplash and sink joints, since it tolerates slight movement. View on Amazon
  • Corner brackets for securing the top to the cabinet frame from below. View on Amazon

FAQ

Can I replace a laminate countertop without removing the cabinets?

Yes, in most kitchens. You only need to remove the old top, check the boxes, and install the new one on the existing frame. Remove cabinets only if they are damaged or you are changing their layout.

How long does the job usually take?

A single straight run with a sink can often be finished in one long day for an experienced DIYer. Larger kitchens with several runs, corners, and appliance hookups usually take a weekend or longer.

Do I need a plumber to reconnect the sink?

Many homeowners reconnect the supply lines and trap themselves, but a plumber is worth calling if the shutoff valves are old or leak. Water damage is costly, so when in doubt, consult a licensed professional.

Conclusion

Replacing laminate kitchen countertops comes down to checking the cabinets, removing the old top safely, and measuring carefully before you cut. Dry-fit everything, seal the joints with flexible sealant, and take your time with the sink opening. With that sequence, most DIY installations end with a clean, level surface that looks like a professional job.

Ready to choose one?

Lauren Holland

About Lauren Holland

Lauren Holland is part of our editorial team and reviews and edits our kitchen design & remodeling guides, checking product details against manufacturer specifications and owner feedback.