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The toilet flange anchors to the subfloor, usually with wood screws or cement screws, but most of it should sit above floor level at full height. When a flange is flush with the subfloor or below it, it can lead to the creation of leak paths.

Toilets typically connect to your main vent stack, a vertical pipe that runs through all finished levels of your home and exits through the roof. It’s located behind the walls, but if you have an unfinished basement or a utility closet, you may find a portion of it running the vertical length of the space. Some basement toilets use an air admittance valve instead, which is a small vent located in the wall directly behind the toilet that extends upward a few feet from the drain.

The cost to install a new toilet typically runs from $225 to $530. This doesn’t include the price of the toilet itself, which can cost $90 to $1,500 depending on the model and features you choose. You can save money if you choose to install a toilet yourself. However, you might want to hire a pro for this project.

"Due to the many complexities of replacing a toilet flange, it is typically a job best left to the pros," says Jeff Botelho, Angi Expert Review Board member and plumber. "Many times it isn't as simple and straightforward as 'pop off the old one and pop on a new one' because the flange is either glued on (PVC/ABS), soldered on (brass/copper), or caulked in place with a lead & oakum joint (cast iron) and none of these things can be easily reversed without years of training and repetitive practice."

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.