Blocked Basin
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If your bathroom or kitchen sink drains slower than usual, the problem might be more than just a few tufts of hair and food particles.
Leaking Drain Under Basin or Sink
G★★★★★
4.6 · 2,000+ Google reviews
4.6 · 2,000+ Google reviews
A leak in the cabinet under your sink or basin, from the trap, the waste, a connection or a perished flexi hose, quietly rots the vanity and floor and breeds mould if left, so it is worth fixing promptly. Our licensed plumbers find the exact source, reseal or remake the trap and waste connections, replace ageing flexi hoses, and test everything leak-free, carrying common parts so most leaks are fixed on the spot. We catch the cause before it damages your cabinetry. We fix leaks under basins and sinks across Brisbane, Perth and Adelaide, with same-day service where we can and an upfront fixed price.
Why choose Same Day Trades for under-sink leaks
We are local, licensed and insured plumbers who do this work every day, so we get it right the first time, with no mess and no surprises on the invoice.
- Fully licensed and insured plumbers
- Upfront fixed pricing before we start
- Same-day service where we can, with 24/7 phones
- Workmanship guaranteed and the job left clean
- Servicing Brisbane, Perth and Adelaide
Whatever the job, you get honest advice and a tidy, professional result.
Where under-sink leaks come from
A leak in the cabinet under your sink or basin almost always comes from the plumbing below, and pinpointing which part is the first step to fixing it. The usual sources are:
- The P-trap, the U-bend below the waste, from worn seals or loose connections
- The waste outlet, where it joins the sink or basin
- The water supply connections and flexible hoses
- A perished flexi hose that is weeping or has burst
- The tap above, with water running down
Water collecting in the cabinet is the common symptom. We trace it to the exact source and fix it leak-free across Brisbane, Perth and Adelaide.
Why it is worth fixing promptly
An under-sink leak might seem minor, especially a slow one, but it is worth fixing promptly because of the damage it quietly causes. Water pooling in the vanity or kitchen cabinet swells and rots the timber or chipboard base, damages the floor beneath, and creates the damp, dark conditions that breed mould, which is both unsightly and a health concern. Because the leak is hidden inside the cupboard, it often goes unnoticed until the cabinet base is swollen or smelly, by which point there may be real damage. Catching and fixing the leak while it is small is a quick, cheap job; leaving it risks a ruined vanity and a mould problem.
Leaking P-trap
The P-trap, the U-shaped pipe under the sink that holds water to block sewer gases, is one of the most common sources of under-sink leaks. It can leak from worn seals or washers at its connections, from connections that have worked loose, or from a cracked trap. A leaking trap drips into the cabinet below, often only when water is running through it. We check and reseal or remake the trap connections, replace worn seals, or fit a new trap if it is cracked, and test it by running water. Often a leaking trap is simply a seal that has aged or a connection that has loosened, which is a quick, affordable fix.
Waste outlet leaks
Another common leak point is where the waste outlet joins the sink or basin. The waste fitting is sealed to the sink, and over time that seal can fail, letting water leak past it into the cabinet when the sink is used or drains. This can be mistaken for a trap leak, so identifying that the water is coming from the waste-to-sink seal, rather than the trap or connections, matters. We reseal or replace the waste outlet and its seal, ensuring a watertight connection to the sink, and test it. A leaking waste outlet is a straightforward repair once identified, and resolving it stops the water getting into the cabinet.
Supply connection and flexi hose leaks
The water supply connections and flexible hoses under the sink are another frequent source of leaks, and they deserve particular attention because a flexi hose can go from a weep to a burst, flooding the cabinet and beyond. Over time the hoses and connections corrode, perish or loosen, causing drips or, in the worst case, a sudden failure. We check the supply connections and hoses, tighten or reseal leaking connections, and replace old or perished flexi hoses, which is cheap insurance against a burst. If your under-sink leak is at the supply side, we fix it and, if the hoses are ageing, recommend replacing them before they fail.
Finding the exact source
Because an under-sink leak can come from the trap, the waste, the connections or a hose, and water can travel along surfaces before pooling, we take the time to find the exact source rather than guessing. We check each potential point, running water and observing where it actually escapes, so we fix the real cause and not just the first wet spot. This matters because a quick guess can mean resealing the wrong joint and the leak continuing. Once we have pinpointed the source, we repair it properly and test it by running water to confirm it is watertight. Accurate diagnosis is why a professional repair stops the leak for good.
The hidden mould risk
One of the biggest reasons to fix an under-sink leak promptly is the mould it breeds. The enclosed cabinet under a sink is dark and, with a leak, damp, exactly the conditions mould thrives in. Mould under the sink is not just unpleasant and damaging to the cabinet and its contents, it is a health concern, releasing spores into your home. By the time you notice a musty smell or see mould, the leak has usually been there a while. Fixing the leak stops the damp at its source, and we can advise on drying out and cleaning the affected area. Resolving an under-sink leak promptly protects both your cabinetry and your family’s health.
Leaks and your water bill
A leak under the sink, particularly from a supply connection or hose that leaks continuously under pressure, wastes water and can add to your water bill, as well as causing damage. A slow drip may not show dramatically on the bill, but a supply-side leak that runs whenever the water is on adds up. If you have noticed your water bill creeping up along with dampness under the sink, the leak is likely the cause. Fixing it stops both the wasted water and the cabinet damage. Even where the leak is only when draining (not under pressure), the ongoing damage to the cabinet makes prompt repair worthwhile regardless of the water cost.
Repair or replace?
Most under-sink leaks are repairable, and that is the best value, resealing or remaking the trap or waste connections, tightening or replacing a connection, or renewing a flexi hose. Replacement comes in only when a component is cracked or beyond repair, for example a cracked trap or a corroded waste fitting, or when the tap or sink itself is the problem. We will give you an honest assessment: if a simple reseal or part replacement will fix it, we do that rather than replacing more than necessary; if a component is cracked or corroded, we replace it. Either way, we leave the under-sink plumbing watertight and the cabinet protected.
Fixing related issues
While we are fixing the under-sink leak, we can address related issues at the same time, which is more efficient than separate visits. If the tap above is dripping or worn, we can repair or replace it; if the flexi hoses are ageing, we can renew them as flood insurance; and if there is no working isolation valve under the sink, we can fit one so the water can be shut off to that fixture easily in future. Getting it all done in one visit saves time and call-out costs. Just let us know what else needs attention, and we will leave your under-sink plumbing sound, leak-free and easy to isolate.
How much does it cost?
Fixing an under-sink leak is usually an affordable job, especially common repairs like resealing a trap, tightening or replacing a connection, or renewing a flexi hose. The cost depends on the source of the leak and the parts needed, with a cracked component needing replacement being a slightly larger job. We carry common parts, so many under-sink leaks are fixed on the spot in a single visit, and we give you an upfront fixed price before we start, so you know the cost. Because a small leak can cause expensive cabinet and floor damage if ignored, fixing it promptly is money well spent.
Same-day plumbing service
A leak under the sink or basin is worth fixing promptly before it damages the cabinet and breeds mould, so there is no need to wait. We offer fast service and same-day appointments where we can across Brisbane, Perth and Adelaide, and we carry common parts so most under-sink leaks are fixed in a single visit. Our phones are answered around the clock. Whether it is a leaking trap, a weeping connection, a perished hose, or a dripping tap running down, we find the source and fix it leak-free, with an upfront price, protecting your vanity, cabinet and floor from water damage.
Checking for other leaks
When we attend an under-sink leak, we can also give your other under-sink and under-vanity plumbing a quick check, since the same ageing seals, connections and hoses that caused one leak may be heading the same way elsewhere. Checking the kitchen, bathroom and laundry under-sink connections, and the condition of the flexi hoses, lets us catch and prevent other leaks before they cause damage. If we find ageing hoses or connections at risk, we will let you know, so you can decide whether to have them attended to as cheap preventive maintenance. A quick check can save you another leak and the damage it would cause down the track.
Licensed, guaranteed plumbers
Fixing a leak under a sink or basin is best done by a licensed plumber who will find the real source, the trap, waste, connection or hose, and fix it leak-free, rather than a temporary fix that drips again and keeps damaging the cabinet. Our team is fully licensed and insured, we reseal and replace traps, wastes, connections and hoses, fit isolation valves, and test everything, and we back our work. You get upfront fixed pricing, tidy work, and under-sink plumbing that is watertight with your cabinetry protected. For a plumber near you for a leak under the sink or basin, we cover Brisbane, Perth and Adelaide.
Under-sink leak FAQs
Why is there water under my sink?
Water in the cabinet under a sink or basin usually comes from the P-trap, the waste, the supply connections, or a perished flexi hose. We find the exact source and fix it.
Is a leak under the sink serious?
It can be. Left unchecked, water in the cabinet rots the vanity base and floor and causes mould, so it is best fixed promptly while it is a cheap repair.
Can you fix a leaking trap?
Yes. A leaking P-trap is usually a worn seal or a loose connection, which we reseal or remake, leaving it watertight.
Could it be the flexi hose?
Yes. A perished flexi hose under the sink can weep or burst. We replace ageing hoses as cheap insurance against a flood.
How much does it cost?
Most under-sink leaks are an affordable repair. We give you an upfront fixed price before we start.
Why does my sink leak only when draining?
A leak only when water drains points to the waste or trap rather than the supply. We identify which and fix it.
Yes. A slow under-sink leak creates damp, dark conditions that breed mould, so fixing it promptly protects your health and cabinetry.
Do you service my area?
Yes, we fix under-sink and under-basin leaks across Brisbane, Perth and Adelaide, with same-day service where we can.
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What our customers say?
Why choose us?
Trusted Tradesmen
With hundreds of 5 star reviews, we’re the local tradesmen you can trust.
Transparent Pricing
We make sure you know exactly what you are paying for ahead of time.
Licensed And Insured
You’re in safe hands as our tradesmen are fully licensed and insured to do your job.
Workmanship Guarantee
Our work will be free of defects in workmanship and workmanship will be warranted for life.
Convenient Bookings
We offer convenient booking times that can be worked around your schedule.
Available All Hours
We take calls 24 hours a day and 365 days a year so that we’re always available to be of service.
Trusted Tradesmen
With hundreds of 5 star reviews, we’re the local tradesmen you can trust.
Transparent Pricing
We make sure you know exactly what you are paying for ahead of time.
Licensed And Insured
You’re in safe hands as our tradesmen are fully licensed and insured to do your job.
Workmanship Guarantee
Our work will be free of defects in workmanship and workmanship will be warranted for life.
Convenient Bookings
We offer convenient booking times that can be worked around your schedule.
Available All Hours
We take calls 24 hours a day and 365 days a year so that we’re always available to be of service.