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1 Broken or failing parts inside the tank (like a fill valve, flapper, ball cock or tank lever) may cause a toilet to run continuously. 2  DIY replacement parts for this problem typically cost $5-$50 depending on the brand of toilet, with an average cost of less than $25. 3  This project might take 20-30 minutes or two hours.
Cost to repair a toilet flush valve. To have a toilet flush valve or flapper repaired or replaced, will average about $100 in most areas. Some plumbers may do this type of repair as a flat fee and some will charge by the hour. Always ask before any work begins which way the fees are established for the repair.ost to repair a toilet wax ring. If your toilet is leaking around the base, it is probably the toilet wax ring that seals your toilet with the septic tank line. The cost to replace this ring will average about $150.00 on a national average.