Quick answer
To fix a sink cabinet, start by checking the hinges and adjusting loose screws. Tighten or replace them as needed. If the cabinet sags, install a support bracket to stabilize it.
Confirm the symptom
- Cabinet doors sag or don't close properly
- Hinges creak or feel loose
- Water leaks into the cabinet area
- Cabinet feels unstable or wobbles
- Hardware is missing or damaged
Tools and prep
- Screwdriver (Phillips and flathead)
- Adjustable wrench
- Tape measure
- Wooden shims
- Replacement hinges or screws
- Cabinet support bracket
- Turn off water supply to the sink
- Wipe down the cabinet to avoid slips
Step-by-step troubleshooting
- Inspect the HingesDo: Check all hinges for loose or missing screws.Observe: Screws may be loose or stripped.Means: Loose hinges cause doors to sag or misalign.Next: Tighten or replace screws.
- Tighten ScrewsDo: Use a screwdriver to tighten any loose hinge or cabinet screws.Observe: Screws may not grip the wood anymore.Means: Stripped screws won't hold securely.Next: Replace stripped screws with longer ones.
- Adjust the HingeDo: Loosen the hinge slightly and adjust the door position.Observe: Door aligns better after adjustment.Means: Improper alignment causes sticking or sagging.Next: Re-tighten the hinge and test the door.
- Install Support BracketDo: Attach a cabinet support bracket to the underside of the cabinet.Observe: Cabinet becomes more stable.Means: Support helps prevent sagging over time.Next: Check for any remaining wobbling.
- Check for Water DamageDo: Look for warped wood or mold near the sink area.Observe: Water damage weakens the cabinet structure.Means: Moisture can lead to rot and instability.Next: Dry the area and consider replacing damaged parts.
- Replace Damaged HingesDo: Remove old hinges and install new ones using the correct screws.Observe: Door closes smoothly without sagging.Means: New hinges restore proper function.Next: Test the door movement and alignment.
Common causes
| Cause | Likelihood | Difficulty | Part often needed |
|---|---|---|---|
| Loose or missing screws Screws work loose over time from daily use. | Common | Easy | Screws |
| Stripped screw holes Repeated tightening damages the wood around the screw holes. | Common | Easy–Medium | Wood anchors or longer screws |
| Worn-out hinges Hinges can bend or break from constant use. | Sometimes | Medium | Replacement hinges |
| Water damage Moisture causes wood to swell, warp, or rot. | Sometimes | Medium | Cabinet repair kit or replacement panels |
| Improper installation Original installation may have been faulty. | Rare | Hard | Cabinet professional installation |
| Cabinet sagging Heavy items in the cabinet pull it down over time. | Sometimes | Easy | Support bracket |
Parts matching
Common parts for sink cabinet repairs include:
- Screws (wood or drywall)
- Cabinet hinges (standard or soft-close)
- Support brackets (L-shaped or adjustable)
- Wood shims
- Waterproof sealant
- Cabinet repair kit (includes screws and hinges)
Measure the existing parts to ensure proper fit before purchasing replacements.
When to call a professional
- Cabinet is severely warped or rotted
- Structural damage affects the entire cabinet
- You're unsure about electrical or plumbing connections
- Repairs require cutting or major modifications
- Multiple cabinets are affected and need alignment
FAQ
How do I stop my sink cabinet from sagging?
Install a support bracket under the cabinet and ensure all screws are tightened. Avoid overloading the cabinet with heavy items.
Can I use regular screws for cabinet hinges?
Use wood screws for wooden cabinets and drywall screws for cabinets attached to drywall. Avoid over-tightening to prevent stripping.
Why does my cabinet door keep coming loose?
Loose doors are often due to stripped screw holes. Replace the screws with longer ones or use wood anchors for better grip.
How do I fix a warped sink cabinet?
Remove the warped panel if possible and let it dry completely. If the damage is severe, replace the panel with a new one.
What's the best way to prevent water damage to my sink cabinet?
Seal the cabinet with waterproof caulk around the sink and ensure the sink drain is properly sealed. Wipe up spills immediately.