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If your toilet is still leaking after replacing the toilet flapper, then you may not have installed the toilet flapper correctly. Double-check that you have placed the flapper over the overflow tube correctly, and check the flapper chain is at the right length. If your toilet is still leaking, then you may have another problem on hand. For example, you may need to replace the toilet wax ring or replace the toilet fill valve if your toilet is wobbly and leaking from around the base.

The biggest sign that your flange leaks is if you notice water at the base of the toilet. The cause is likely due to a poor flange installation, so you might have issues with loose bolts, an uneven flange, or a cracked plastic flange. Add a deteriorating wax seal to this, and you have a recipe for disaster. The best solution is to shut off the water valve, replace the toilet flange, and seal it with a new wax ring.

The average cost to hire a plumber is typically between $45 and $200 per hour, with a common average rate around $125 per hour. This cost can vary based on your location, the plumber's experience, and the complexity of the job. Rates are often broken down by experience level: an apprentice may charge $45 to $90 an hour, a journeyman $60 to $110 an hour, and a master plumber $80 to $200 an hour. While hourly rates are standard, some plumbers may charge a flat fee for routine projects or offer project-based pricing. It's also common for plumbers to charge a minimum service or trip fee. For reference, some typical flat-rate costs for common jobs include: drain unclogging ($220), leaky faucet repair ($270), burst pipe repair ($400), toilet repair ($300), and water heater repair ($600). Note that these rates are for standard service hours; emergency, holiday, and after-hours calls will cost significantly more.

A standard toilet flange should fit snugly into the outflow pipe and sit level with the subfloor. Installing a new one without first removing the old one will make it impossible to form a seal and keep the toilet bowl bolted securely in place. 

However, if you’re dealing with leakage or wobbling because you’ve installed a new type of bathroom tile (making the floor taller), you may be able to avoid fully replacing the flange by opting for a toilet flange extender. Extenders typically come in kits for easy DIY installation, fit over the existing flange, and bring the drain connection higher.