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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.
Installing or replacing a toilet can positively affect your happiness, your finances and the planet. The average cost to install or replace a toilet is $377, although prices can vary anywhere between $224 and $538. Start by selecting a licensed plumber who can tell you whether your existing plumbing presents any limitations and help you determine what kind of toilet will work best in your bathroom.