Swollen kitchen cabinets in Canberra usually cost $450 to $9,000 to fix
A small dry cabinet repair is often $450 to $1,200. A wet sink cabinet replacement is usually $900 to $2,400 plus plumbing. If water has reached several carcasses, flooring or the benchtop support, allow $3,500 to $9,000 before deciding whether repair or renovation is smarter.
Urgency triage: what the symptom usually means
| Symptom | Likely cause | How urgent | Likely repair cost |
|---|---|---|---|
| Occasional drip under sink, cabinet still dry | Loose trap nut, washer, mixer hose or dishwasher hose | Today for containment, plumber if it repeats | $0 DIY check to $350 call-out, then $120 to $280 parts and labour |
| Swollen shelf under sink | Slow leak from trap, tap hose or dishwasher point | Same week once leak is stopped | $450 to $1,200 for shelf or base repair, plus plumbing if needed |
| Cabinet side bulging and doors scraping | Particleboard carcass has taken up water | Same week if still damp | $900 to $2,400 for sink cabinet replacement |
| Benchtop dipping near sink | Failed cabinet rails or rotten support | Same week, avoid loading the bench | $1,800 to $4,500 depending on benchtop removal |
| Mould smell, black spotting, soft kickboards | Long-term leak and poor drying | Same week, faster if anyone has asthma | $1,500 to $6,500 for removal, repair and making safe |
| Water under floating floor near kitchen | Appliance leak, fridge line, dishwasher or sink overflow | Same day to stop water, then assess | $350 to $900 plumbing, $1,500 to $7,500 flooring and cabinet works |
What you can safely do yourself
First, stop the water. Turn off the mini stop valves under the sink if the leak is from a tap hose, dishwasher hose or filter line. If there is no local shut-off, use the main water valve and call a plumber. Put a tray or towel under the leak, remove cleaning products from the cabinet, and take photos before you start drying. Photos matter for insurance and for a later quote.
Second, dry the cabinet without hiding the problem. Open doors, remove the kickboard if it clips off, run a fan and keep the area ventilated. Do not seal wet particleboard with paint, silicone or contact adhesive. That traps moisture and can make mould worse. If the leak was a one-off spill and the cabinet is still square, you may not need a tradesperson at all. A $15 tray under the sink and a 24 hour recheck can be enough.
Third, test the leak after drying. Put dry paper towel under the trap, run the sink, then run the dishwasher drain cycle if the hose connects there. If the paper stays dry and the cabinet has not swollen, you can monitor it. If the paper gets wet again, bring in a licensed plumber before paying for cabinetry. Cabinet repairs done before the leak is fixed are wasted money.
What can wait and what cannot
A dry stain can wait. Many Canberra kitchens have old staining under the sink from a past trap leak, especially in older Belconnen and Woden homes. If there is no smell, no active moisture, no swelling and the doors still line up, there is no need to pay a cabinetmaker today. Add it to your future makeover or full renovation plan.
Active water cannot wait. A leaking dishwasher hose or mixer hose can soak the cabinet base and run under floating floors in one evening. Canberra’s cold winters slow drying, and closed sink cabinets hold damp air. If the kitchen has a timber floor, laminate floor or apartment body corporate below it, treat escaping water as urgent.
A sagging benchtop is also urgent, even if the leak has stopped. Stone, porcelain and heavy laminate tops rely on level, continuous support. If the sink cabinet has collapsed, the top can crack around the sink cut-out. A temporary prop may reduce risk for a day or two, but it is not a repair. For a benchtop-specific decision, compare the numbers on our benchtop replacement cost page.
Not sure whether it is repair or renovation?
Send photos of the sink cabinet, kickboards, benchtop edge and the leak source. We will tell you if a cheaper repair is sensible.
How the repair is usually priced
For a single damaged sink cabinet, the job often starts with a plumber visit, then a cabinetry repair. The plumber might charge $350 to $650 to identify and fix a simple trap, mixer hose or dishwasher connection issue, more if parts or access are poor. The cabinetmaker then removes the swollen base, replaces the shelf or carcass, rehangs doors and adjusts hinges.
If the benchtop can stay in place, the repair is cheaper. If the top must come off, risk and labour increase. Laminate is relatively forgiving. Porcelain, natural stone and older engineered stone are not. Since conventional engineered stone is banned for new work, replacing an old damaged top with the same product is not a normal option. We would price compliant alternatives through our benchtops service.
For widespread damage, the honest question is whether the kitchen is worth saving. A $6,000 repair in a 25 year old kitchen with poor storage may only delay the real job. On the other hand, a $1,100 under-sink cabinet repair in a good 8 year old kitchen is exactly the sort of small, sensible work that avoids a premature renovation.
Ask what your water-damaged cabinet needs
Send photos and the leak history, and we will reply within 1 business day with repair or renovation advice.