A leaking drain might start as a small drip under the sink or a bathtub that takes forever to drain, but left unattended, these problems can cause cabinet rot, mould, and costly structural water damage. The good news is that most drain leaks and faulty stoppers follow a predictable pattern, and with the right approach, many can be fixed before they become serious. If you are in Sydney and need a professional to diagnose or fix a drain issue, your local plumber in Sydney at All Day Plumbing is available seven days a week.
How to Repair a Kitchen Sink Drain Leak
Kitchen sink drain leaks usually originate at one of three points: the drain flange where the strainer meets the sink basin, the slip joint connections on the P-trap, or the connection where the trap meets the wall drain. Identifying the source before you start pulling things apart saves a lot of time.
Run water into the sink and use a dry cloth or paper towel to feel along each joint while the water is draining. The joint that wets the cloth first is your leak point.
Leak at the drain flange: This is the most common kitchen sink drain leak. The plumber’s putty or silicone seal between the flange and the sink basin has dried out or cracked. To fix it, unscrew the P-trap and tailpipe, then unscrew the lock nut beneath the sink. Lift out the strainer, remove the old putty or sealant, apply a fresh bead of plumber’s putty or silicone, and reseat the flange. Tighten the lock nut firmly and re-assemble.
Leak at a P-trap joint: P-trap slip joint washers harden and crack over time. Unscrew the slip nuts at each end of the P-trap by hand or with channel lock pliers. Remove the old washer, replace it with a new rubber washer of the same size, and reassemble. Do not overtighten. If the plastic threads are damaged, replace the entire P-trap assembly, which is inexpensive and available at any hardware store.
For leaks deeper in the wall or that you cannot locate visually, All Day Plumbing’s drain repair team in Sydney can use CCTV camera inspection to find the exact source without breaking open walls unnecessarily.
How to Repair a Bathtub Drain Stopper
A bathtub drain stopper that does not seal properly means the bath will not hold water. A stopper that does not open properly means the bath drains too slowly or not at all. Both issues are common in Sydney homes and are usually straightforward to fix.
There are several types of bathtub stoppers:
- Push-pull stoppers: Twist to loosen the cap, unscrew the set screw beneath, and lift out the stopper body. Clean hair and debris from the drain opening, inspect the rubber seal on the stopper, and replace the stopper if the seal is worn.
- Lift-and-turn stoppers: These work similarly to push-pull types. Lift the stopper, turn it counter-clockwise, and unscrew. Replace the O-ring or the stopper assembly if the seal is degraded.
- Trip lever stoppers: These are controlled by the overflow plate on the end of the bath. Remove the two screws on the overflow plate and pull out the entire linkage assembly. Clean it thoroughly and adjust the length of the lower linkage rod. If the stopper plunger is worn, replace the entire linkage assembly.
- Toe-touch stoppers: Lift the stopper and turn counter-clockwise to unscrew. Replace the rubber seal or the complete stopper if damaged.
If your bathtub stopper repair is straightforward but your bath is still draining slowly, the issue may be a partial blockage further down the drain. The team at All Day Plumbing can clear blocked shower and bath drains, including blocked shower drain repairs in Sydney, using professional equipment that gets results on the first visit.
How to Repair a Leaking Sink Drain Pipe
If the leak is not at the flange or the P-trap, it may be in the drain pipe inside the wall or under the floor. These leaks are harder to locate and usually require professional diagnosis. Signs that the leak is in the drain pipe rather than at an accessible fitting include:
- Water stains on the wall or ceiling below the bathroom
- A persistent damp or musty smell that persists even after cleaning the accessible drain fittings
- Visible mould growth on the wall or cabinet that returns after cleaning
- Softness or warping in the floor near the sink or bathtub
These symptoms indicate that water has been leaking long enough to saturate building materials. Do not ignore them. The longer a hidden pipe leak continues, the more expensive the repair becomes.
When Should You Call a Plumber for a Drain Leak?
Minor sink drain leaks at accessible fittings are often within DIY scope for a careful homeowner. However, call a licensed plumber when:
- The leak source is inside a wall, ceiling, or under a concrete slab
- The drain pipe itself is cracked, corroded, or displaced
- You have replaced fittings and the leak has returned
- There are signs of water damage to surrounding structures
- The leak is at a solvent-welded plastic pipe joint or a copper compression fitting
All Day Plumbing handles all types of residential drain repairs across Sydney, from simple washer replacements to full drain line replacements. We are available seven days a week, including after hours for urgent leaks. To book a drain inspection or repair, contact our team at Drain Repairs Sydney or call 1300 301 354 today.