General Plumbing Repairs

Sink Leak Repair

Sink leak repair resolves water leaks under kitchen sinks before they cause damage to units, floors, or adjacent rooms. The service focuses on finding the exact source of the leak, isolating the water safely, repairing or replacing the failed component, and testing thoroughly so you can use the sink with confidence again.

More information

What sink leak repair covers

A targeted repair for leaks under kitchen sinks, with a focus on a clean finish and reliable performance.

  • Pinpointing the source of the leak (waste side or supply side)
  • Isolating the water supply safely before work starts
  • Repairing or replacing leaking traps, wastes and seals
  • Repairing leaks on supply pipes, isolation valves and flexible hoses
  • Re-making joints and connections where movement or wear has caused drips
  • Functional checks on flow and drainage, plus leak testing after the repair

When this service is the right fit

This service is ideal if you have any of the following:

  • Drips or pooling water in the kitchen unit under the sink
  • A musty smell, swollen chipboard, or damp patches near the cabinet base
  • Leaks that start when the tap runs, the dishwasher drains, or the sink empties
  • A slow drip from a trap, waste connection, or a valve on the pipework

It suits homeowners who want the job done properly first time, and landlords or small premises needing a dependable fix and clear updates.

How the repair is carried out

The repair starts with a practical inspection to identify whether the leak is from the waste and trap assembly, a joint, or the pressurised supply pipework. The water is then isolated, the faulty part is repaired or replaced, and seals are re-made as needed. Finally, the sink is run and drained while connections are monitored to confirm everything is dry and working as it should.

After the repair

You will know what caused the leak and what was done to resolve it. If any nearby components look close to failing, you can get clear advice on sensible next steps to reduce the risk of a repeat issue. If water has escaped for a while, you may also be advised on drying and checking the surrounding unit and flooring.

Frequently Asked Questions

What usually causes a leak under a kitchen sink?
Common causes include worn seals on the trap or waste, loose compression fittings, cracked plastic fittings, or a failing isolation valve or flexible tap hose. Sometimes movement in the pipework causes joints to weep over time.
Should I turn the water off before the plumber arrives?
If you can safely locate the isolation valves under the sink and stop the leak, it is worth doing. If not, avoid forcing stiff valves and place a container and towels to limit damage until the leak can be isolated properly.
Can you fix a sink leak without replacing the whole sink or tap?
In most cases, yes. Many leaks come from the trap, waste fittings, valves, or hoses rather than the sink itself, so a targeted repair is often all that’s needed.
Will you need access inside the kitchen unit?
Yes, the work is usually carried out from inside the cupboard under the sink to reach the trap, waste, and supply connections. Clearing the space under the sink beforehand helps speed up diagnosis and repair.
How do you confirm the leak is fully repaired?
The repair is tested by running the tap and checking all supply joints under pressure, then filling and draining the sink while inspecting the waste connections. The area is checked for any slow weeps before the job is signed off.

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