--- title: "Toilet Repair | Northstar Plumbing" description: "Fix running toilets, weak flushes and leaks with clear fault diagnosis, quality parts and thorough testing to restore reliable use." canonical: "https://www.northstarplumbing.co.uk/services/toilet-repair" --- ![Man kneels repairing open toilet tank with red-handled pliers in tiled bathroom](/_next/image?url=%2Fapi%2Fmedia%2Ffile%2Fman-repairing-toilet-tank.jpg%3Fv%3D1768575128906&w=1536&q=75&dpl=dpl_DEc4fGhEc1SCRZZutzoEsRuDy1CJ)![Man kneels repairing open toilet tank with red-handled pliers in tiled bathroom](/_next/image?url=%2Fapi%2Fmedia%2Ffile%2Fman-repairing-toilet-tank.jpg%3Fv%3D1768575128906&w=1536&q=75&dpl=dpl_DEc4fGhEc1SCRZZutzoEsRuDy1CJ) General Plumbing Repairs # Toilet Repair [Contact Us](https://www.northstarplumbing.co.uk/redirect) Toilet repair restores safe, reliable flushing when your WC is running constantly, leaking, rocking, or not clearing properly. The service focuses on accurate fault finding, fitting the right replacement parts, and testing everything thoroughly so you can use the toilet with confidence again. ## What toilet repair covers Most toilet problems come down to worn seals, faulty valves, or loose connections. A repair visit is designed to stop leaks, improve flushing performance, and prevent repeat call-outs. - Diagnosis of the cause of running, weak flushing, slow filling, or noisy operation - Repair or replacement of common internal components (for example fill valves, flush valves, siphons, diaphragms, handles and seals) - Fixing leaks from the cistern, isolation valve, inlet pipework, or pan connector - Tightening and stabilising loose toilets and correcting minor movement where safe to do so - Resealing where appropriate and checking for hidden seepage - Functional testing and final checks for leaks, flush performance, and refill level ### When a toilet repair is the right choice Book a repair if you notice any of the following: - Water running into the pan long after flushing - A weak or incomplete flush - A cistern that refills very slowly or keeps overfilling - Drips or damp patches around the base of the toilet - The toilet feels loose, rocks, or makes creaking sounds - Unexplained increases in water use ### What to expect on the day The water supply will be isolated so the issue can be worked on safely. The fault is identified first, then the repair is completed using suitable parts and fittings. Once repaired, the toilet is tested through multiple flushes and the area is checked for leaks before the job is signed off. ### After the repair You will get a clear summary of what caused the problem and what was replaced or adjusted. If the toilet is heavily worn or the issue is likely to recur, you will be advised on practical next steps, such as upgrading the flush mechanism or planning a replacement. [Contact Us](https://www.northstarplumbing.co.uk/redirect) ## Frequently Asked Questions Why does my toilet keep running after I flush? It is usually caused by a faulty flush valve seal, siphon diaphragm, or a fill valve that is not shutting off correctly. A repair involves isolating the supply, identifying the failing part, and fitting the right replacement before testing. What causes a leak around the base of the toilet? Common causes include a failed pan connector, a poor seal, or movement that has broken the seal over time. The repair focuses on finding the leak source and making the toilet stable and watertight again. Can a weak flush be repaired without replacing the whole toilet? Often, yes. Weak flushing is commonly linked to worn internal parts, incorrect water level in the cistern, or a partial blockage, all of which can be addressed during a repair visit after inspection. How long does a toilet repair usually take? Many faults can be resolved within a single visit, depending on access and the exact parts required. More complex leaks or stability issues can take longer, especially if additional work is needed to make the installation secure. Should I turn off the water before the plumber arrives? If you have an active leak or the toilet is running constantly, turning off the isolation valve can help reduce water waste. If you cannot locate it or it is stuck, leave it and explain the situation on arrival. [Contact Us](https://www.northstarplumbing.co.uk/redirect) ## Related Services Complete your experience with these services - Water Supply Fault Investigation [View](/services/water-supply-fault-investigation) - Water Efficiency Repairs [View](/services/water-efficiency-repairs) - Valve Replacement (Local) [View](/services/valve-replacement-local) - Tap Repair [View](/services/tap-repair) Show more services - Stopcock Repair [View](/services/stopcock-repair) - Sink Leak Repair [View](/services/sink-leak-repair) - Shower Repair [View](/services/shower-repair) - Sealant Repair (Sanitary) [View](/services/sealant-repair-sanitary) - Running Toilet Investigation [View](/services/running-toilet-investigation) - Radiator Leak Repair [View](/services/radiator-leak-repair) - Radiator Bleeding [View](/services/radiator-bleeding) - Pipe Leak Repair [View](/services/pipe-leak-repair) - Overflow Repair [View](/services/overflow-repair) - Noisy Pipework Investigation [View](/services/noisy-pipework-investigation) - Minor Plumbing Fault Diagnosis [View](/services/minor-plumbing-fault-diagnosis) - Minor Pipework Alteration [View](/services/minor-pipework-alteration) - Low Water Pressure Investigation [View](/services/low-water-pressure-investigation) - Loose Fixture Securing [View](/services/loose-fixture-securing) - Leak Repair (Internal) [View](/services/leak-repair-internal) - Isolation Valve Repair [View](/services/isolation-valve-repair)