A leaking kitchen sink is usually caused by a worn tap washer, a failed sink-to-benchtop seal, a loose P-trap, or a corroded supply line — and each has a different fix. Pro Tap Plumbing and Maintenance offers same-day kitchen sink plumbing repair with upfront, fixed pricing before any work starts. Here’s how to identify what’s actually wrong before you call anyone.
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"Pro Tap Plumbing arrived quickly and fixed our leak professionally. Exceptional service, friendly team, and very reasonable pricing. Highly recommend them."
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To fix a leaking kitchen sink, first identify whether the leak is coming from the tap, the sink basin seal, or the drain trap underneath—tightening the wrong connection can make the leak worse instead of fixing it.
Why this matters: we see homeowners tighten the wrong fitting more than any other repair mistake. Over-tightening a P-trap connection, for example, can crack ageing plastic fittings and turn a small drip into a full leak — which is often how a £150 job becomes a £400 one.
A blocked kitchen sink is usually caused by a build-up of grease, food particles, or coffee grounds in the trap or the pipe just past it, and can often be cleared without removing the whole trap.
| Blockage Severity | Likely Fix | Typical Time |
|---|---|---|
| Slow drain | Clear trap, flush with hot water | 15–30 min |
| Full blockage at trap | Remove and clean P-trap | 30–45 min |
| Blockage further down the line | Drain snake or jetting | 45–90 min |
| Recurring blockages | Camera inspection to find root cause | 1–2 hours |
If a blockage keeps coming back within weeks of being cleared, that’s usually a sign of a partial collapse or root intrusion further down the pipe — not something a sink plunger will fix long-term.
Minor issues like a worn tap washer can often be fixed without a plumber, but anything involving the drain trap, supply lines, or water pooling inside the cabinet should be handled by a licensed plumber.
A leak left unaddressed for even a few weeks can warp cabinetry and encourage mould growth in the cabinet base. Repair costs almost always come in lower than replacing water-damaged cabinetry, so acting early is the cheaper call.
Most kitchen sink plumbing repairs cost between £90 and £280, depending on whether it’s a simple part replacement or a more involved trap or supply line repair.
Costs rise if the issue turns out to be further down the drain line, which is why an upfront diagnosis before work starts matters — it’s the difference between a fixed quote and a job that grows once the plumber’s already under the sink.
Pro Tap Plumbing and Maintenance quotes kitchen sink repairs upfront before work starts, so you know the cost before we touch a single fitting.
Why is my kitchen sink leaking under the cabinet? A leak under the cabinet is usually caused by a loose or cracked P-trap, a corroded supply line, or a failed seal where the sink meets the benchtop. Check for pooling water and rust on fittings to narrow down the cause before calling a plumber.
How much does it cost to fix a leaking kitchen sink? Most kitchen sink leak repairs cost between £90 and £280, depending on whether it’s a tap washer replacement or a more involved trap or seal repair. Costs increase if the issue is further down the drain line.
Can I fix a kitchen sink leak myself? Minor fixes like a worn tap washer can often be handled without a plumber, but anything involving water pooling inside the cabinet, a cracked trap, or a corroded supply line should be repaired by a licensed plumber. DIY attempts on trap fittings can crack ageing plastic and make the leak worse.
Why does my kitchen sink keep blocking? Recurring blockages are usually caused by grease or food build-up in the trap, but if they return within weeks of clearing, it often points to a partial pipe collapse or root intrusion further down the line. A camera inspection is the fastest way to confirm the cause.
How quickly can a plumber fix a kitchen sink leak? Most kitchen sink leak repairs are completed same-day, with simple fixes like a tap washer replacement taking under an hour. More involved repairs, like a supply line or trap replacement, typically take 30–90 minutes.
Is a leaking kitchen sink an emergency? A leak that’s pooling water inside the cabinet or dripping continuously should be treated urgently, since it can warp cabinetry and cause mould within a few weeks. A slow drip from a tap is less urgent but still worth fixing before it worsens.
Most kitchen sink leaks and blockages come down to four fixable causes — a worn washer, a failed seal, a loose trap, or a corroded supply line — and identifying which one you have before calling a plumber saves both time and money. Leave anything involving the trap, supply lines, or cabinet pooling to a licensed plumber to avoid making the problem worse.
Got a leaking or blocked kitchen sink? Book a same-day callout with Pro Tap Plumbing and Maintenance and get an upfront, fixed-price quote before any work starts.
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