How to Replace the Floor in the Cabinet Under the Kitchen Sink

Leaking pipes and defective drains are part and parcel of being a homeowner, and if not found immediately can cause damage to the floor of the cabinet in which the water source is located. If you've recently found and repaired a water leak in your home, you may be left wondering how to repair the damaged floor in the cabinet under the faulty sink. You'll be pleased to learn there's a set process for this repair, and it can be performed with a minimum of time and tools.

Working under the sink is working in cramped quarters.

Step 1

Turn off the water supply and disconnect the water and drain pipes located beneath the sink.

Step 2

Measure the width and depth of the cabinet floor as well as the pipe openings.

Step 3

Transfer the measurements to a piece of 1/2 inch plywood, taking care to check all measurements for accuracy.

Step 4

Cut the plywood, using a circular saw for the outside cuts and a jig saw for the pipe opening cuts.

Step 5

Remove the existing floor of the cabinet by cutting two inches in from the front, back and sides with a jig saw. You will now have an opening that exposes the subfloor below, with a two-inch lip around the parameter of the cabinet floor.

Step 6

Place the new flooring piece directly onto the two inch lip on the bottom of the cabinet, over the exposed pipes.

Step 7

Screw the new floor into place, using one-inch wood screws to fasten the new floor securely to the two-inch framework.

Step 8

Reconnect the pipes and turn on the water supply, checking all connections for leaks and tightening as needed to provide dry connections.