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Cabinet bottom replacement

Replacing the base of a kitchen sink cabinet after a slow supply-line leak had destroyed the particleboard floor of the unit. This is one of the most common calls we get, and one of the most worthwhile repairs. The cabinet carcass and doors are usually sound; it is only the deck under the sink that has swollen and collapsed. Replacing that panel costs a fraction of a new cabinet run and takes a few hours rather than days. Our crew removed the failed material, checked the framing and the subfloor beneath for spread, cut and fitted a new sealed panel, and confirmed the source of the leak was repaired before closing up. We finish the new deck so a future leak sits on the surface instead of soaking in. If the base of your sink cabinet feels soft underfoot or smells musty, it is worth looking at before the damage reaches the floor structure.

Project scope

A slow supply-line leak had destroyed the particleboard floor of a kitchen sink cabinet. The cabinet box and doors were still sound, so the repair was limited to the deck under the sink. Our crew removed the swollen material, checked the framing and the subfloor underneath for spread, cut and fitted a new sealed panel, and confirmed the leak itself was repaired before closing up.

The new deck was finished so a future drip sits on the surface where it can be seen and wiped, instead of soaking in.

How we approach sink cabinet floor repairs

This is one of the most common calls we get. The repair takes a few hours, not days, and avoids replacing a cabinet run that has nothing else wrong with it.

  • Find and stop the water source first, whether it is a supply line, a trap or the faucet base.
  • Cut out all swollen particleboard back to firm edges.
  • Inspect the toe-kick area and subfloor with a moisture meter, not just by touch.
  • Let damp material dry and treat any surface mold before covering it.
  • Fit a new panel on proper supports and seal its faces and edges.
  • Run water and recheck every joint before the cabinet is reloaded.

What to know before a similar job

If the base of your sink cabinet feels soft or smells musty, have it looked at now. The panel is cheap to replace; the floor structure under it is not. A quick check you can do yourself: empty the cabinet, press on the deck near the back corners, and run a dry paper towel along each supply line and the trap.

Replacing a cabinet floor needs no permit. If we find that moisture has reached the subfloor or the wall behind, the job becomes a water damage repair and we will show you the readings before recommending anything further.

Related services

Snap a photo of the damaged cabinet floor and send it with your request for a free written estimate.

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