How to Repair Water-Damaged or Swollen Cabinet Doors

Water damage to cabinet doors happens quietly and fast. A slow sink leak, a dishwasher overflow, or months of bathroom humidity can cause wood to absorb moisture and swell. When it happens, the doors won't close flush, they bind at the top or bottom, and they feel soft to the touch. The good news: caught early, most swelling can be reversed. The wood needs to dry completely, the swollen areas need to come back down, and then you seal it so it doesn't happen again. But there's a threshold. If the damage is deep—if the veneer is separating, if the wood is spongy or discolored with mold—you're better off replacing the door entirely. This guide walks you through assessing what you have and deciding whether to repair or replace.

1. Strip Doors from Hinges. Open each door fully and support its weight with one hand. Use a cordless drill or screwdriver to remove the hinge screws from the cabinet frame (not the door itself). Set the screws aside in a labeled container—you'll need them again. Lay each door flat on a clean, dry surface like a workbench or sawhorses.
2. Know When to Replace. Look at the face, edges, and back of each door. Press your thumb firmly into the wood in several spots. If it feels firm and the damage is only surface swelling or warping, you can repair it. If the wood is soft, spongy, or dark-stained, if the veneer is lifting or peeling, or if you see mold or mildew, the damage is structural and replacement is the better choice. Light surface discoloration or minor edge swelling is repairable. Deep penetration, rot, or delamination is not.
3. Dry Out the Doors. Move the doors to a warm, dry space with low humidity—a heated garage, basement with a dehumidifier, or spare bedroom works well. Stand the doors upright on sawhorses or lean them against a wall, spaced a few inches apart so air can circulate around all sides. Position a fan nearby to move air across the surfaces. If possible, lower the room humidity to below 50 percent using a dehumidifier. Doors should dry for at least 72 hours, though 5 to 7 days is better for deeper swelling.
4. Smooth Out the Swelling. Once the doors are completely dry, inspect them again. If there's still visible surface swelling, start with 80-grit sandpaper on a belt sander or orbital sander. Sand with the grain, working in long, even strokes. Sand down the swollen areas until they feel flush with the surrounding surface. Move to 120-grit, then 150-grit for a smoother finish. Sand the entire door face and edges, not just the damaged spots, so the finish looks even. Wipe away all dust with a damp rag and let it dry.
5. Fill the Low Spots. If sanding has left small dents or if the wood grain is raised and irregular, use a wood filler that matches the door color. Apply it with a putty knife, overfilling slightly, and let it dry completely per the product instructions. Sand it smooth with 150-grit paper, then 220-grit for a final finish. Wipe clean with a damp rag.
6. Seal the Vulnerable Edges. The edges and especially the bottom edge of the door are where water enters the wood. These areas need to be sealed before you finish. Paint them with a water-based primer, paying special attention to the bottom edge, side edges, and any cutouts. Use a small brush and apply primer generously. Let it dry per the can instructions, usually 1 to 2 hours.
7. Prime Both Surfaces. Lay the door flat and prime the entire face and back with a water-based primer suitable for kitchen cabinets. Use a roller or brush to apply an even coat. Pay extra attention to raised panels and detail work, making sure primer gets into every groove. Let it dry completely—at least 2 to 3 hours—before flipping and priming the other side.
8. Rough Up for Finish. Once the primer is dry, lightly sand the entire door with 220-grit sandpaper. This roughens the surface just enough for the finish coat to stick and removes any raised grain. Sand in the direction of the wood grain with light pressure. Wipe away all dust with a tack cloth.
9. Coat with Matching Finish. Apply a water-based polyurethane, polycrylic, or cabinet enamel in the color and sheen that matches your cabinet doors. Use a high-quality brush or roller to apply a thin, even coat. Let it dry per the manufacturer's instructions, usually 4 to 8 hours. Apply a second coat if needed for uniform coverage and durability. A matte or satin finish is more forgiving than gloss and hides imperfections better on repaired doors.
10. Hang the Repaired Doors. Once the finish is completely dry (24 hours is ideal), carry each door carefully back to the cabinet. Align it with the hinge cutouts you noticed earlier. Screw the hinges back into the frame using the original screws. Start with the top hinge, making sure the door is level and plumb before fully tightening. Then install the bottom hinge. Check that the door closes smoothly, sits flush with its neighbors, and doesn't bind.
11. Block Future Water Entry. Run a bead of paintable caulk along the seams where the door frame meets the cabinet box, and where the door edges meet the adjacent doors. This prevents moisture from seeping into the cabinet interior again. Use a caulk gun and smooth the bead with a wet finger. Let it dry per the product instructions, then paint over it with matching cabinet paint if needed.
12. Fix the Root Cause. Before closing up, figure out why the water damage happened in the first place. Check for leaks under the sink, seal around the faucet penetration, inspect the dishwasher door seal, or improve bathroom ventilation. Measure the humidity in the room with a cheap hygrometer and aim to keep it below 55 percent, especially in kitchens and bathrooms. If humidity is chronically high, a small dehumidifier or better exhaust fan will protect your cabinets long-term.