how to replace bottom of cabinet under sink

Daniel Parker

3 min read

·

20-01-2025

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Dealing with a water-damaged or otherwise ruined cabinet under your sink? Replacing the bottom is often easier and more cost-effective than replacing the entire cabinet. This guide shows you how to do it yourself, saving you money and the hassle of a professional.

Assessing the Damage & Gathering Supplies

Before you begin, carefully assess the damage. Is the damage limited to the bottom of the cabinet? If the damage extends to the sides or the back, you may need to replace more than just the bottom. If so, the process may be more involved.

You'll need these supplies:

• Measuring Tape: Accurate measurements are crucial for a proper fit.
• Pencil: Mark cut lines on your new wood.
• Safety Glasses: Protect your eyes from flying debris.
• Work Gloves: Protect your hands.
• Pry Bar or Flathead Screwdriver: Carefully remove the old bottom.
• Circular Saw or Jigsaw: Cut the new piece to size (a jigsaw is better for tight spaces).
• Safety Glasses: Protect your eyes from sawdust and debris.
• Wood Screws: Attach the new bottom securely.
• Drill with appropriate bit: To pilot holes for screws.
• Replacement Wood: Choose a moisture-resistant wood like plywood or treated lumber. Match the thickness of the original cabinet bottom as closely as possible.
• Wood Glue (optional): For added strength and water resistance.
• Clamps (optional): Hold the new bottom in place while the glue dries.
• Sandpaper (optional): Smooth any rough edges.

Step-by-Step Guide to Replacing the Cabinet Bottom

1. Empty the Cabinet: Remove everything from under the sink.

2. Disconnect the Plumbing (If Necessary): If accessing the cabinet's bottom requires moving pipes, carefully disconnect them first. Take photos before disconnecting anything to help with reassembly. Remember to turn off the water supply first!

3. Remove the Old Cabinet Bottom: Carefully pry off the old bottom panel using a pry bar or flathead screwdriver. Start by removing any nails or screws holding it in place. Be gentle to avoid damaging the surrounding cabinet. Take note of how the old bottom was attached.

4. Measure and Cut the New Bottom: Measure the opening where the old bottom was located. Transfer these measurements to your replacement wood, ensuring it is slightly smaller than the opening to allow for a snug fit. Cut the new piece to size using a circular saw or jigsaw. It's better to cut slightly smaller and adjust than to cut too large.

5. Install the New Bottom: Apply wood glue to the edges of the new bottom (optional). Carefully place it into the opening. Secure it in place with wood screws, using pre-drilled pilot holes to prevent splitting. Try to use screws in the same locations as the old ones, if possible.

6. Reconnect the Plumbing (If Necessary): Carefully reconnect the plumbing components you disconnected earlier. Double-check all connections for leaks. Turn the water back on slowly and monitor for leaks.

7. Test for Leaks: Turn the water on and carefully check for any leaks around the sink and the new cabinet bottom.

8. Sand and Finish (Optional): If needed, sand down any rough edges on the new bottom. You can also apply a sealant or paint to match the rest of your cabinet for a more polished look.

Tips for Success

• Choose the Right Wood: Opt for moisture-resistant wood like plywood or treated lumber to prevent future damage.
• Measure Twice, Cut Once: Accurate measurements are key to a proper fit.
• Use Pilot Holes: This prevents the wood from splitting when you screw it in.
• Work Slowly and Carefully: Take your time to avoid mistakes.

By following these steps, you can successfully replace the bottom of your cabinet under the sink and save money on costly repairs. Remember to always prioritize safety and take your time. If you're uncomfortable with any part of the process, it's always best to consult a professional.