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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.
On average nationally, toilet installation or replacement costs $348, with most homeowners spending between $208 and $492. This data is based on actual project costs as reported by HomeAdvisor members. Installing or replacing a toilet can positively affect your happiness, your finances and the planet.eturn to Top. The price that you negotiate with your plumbing contractor for your toilet installation or replacement project can fluctuate -- particularly if additional or unforeseen work is required once the job has begun. A standard job should take between one and two hours to complete.