About Toilet Flange Extenders

When you are installing a toilet, there are many pieces that must work together so that the water drains properly. If the pieces do not work together, there will be leakage. Toilet flange extenders help facilitate a leak-free seal when the flange is not properly exposed.


About Toilet Flange Extenders
When you install a new toilet, or replace an old toilet, the toilet has to attach to a flange.

When you install a new toilet, or replace an old toilet, the toilet has to attach to a flange.  This flange is known as a closet flange, which funnels the water into the drain pipe below the floor.

When the flange is installed, it is usually mounted to the sub-floor, and the finished floor is built up around it.  When the toilet is installed, it needs for 1/2" of that toilet flange to be above floor level.

Toilet flange extenders are used to give additional height to the closet flange if there is not 1/2" of clearance. 


Toilet flange extenders look like a plastic gasket and range in height.

A closet flange extender resembles a large gasket, and is similar in diameter to the exposed end of the toilet flange itself.  When you place the flange extender over the closet flange, the closet bolts should easily be threaded through the appropriate holes.

Flange extensions come in 1/4", 1/2", and 3/4" sizes.  If you install a flange extension and find that there is still a need for additional height, additional flanges may be stacked to achieve the proper height.


Check your local building codes before deciding to use flange rings.

If you are installing new flooring, removing your toilet and using flange extenders can give you a more finished appearance than trimming the floor around the toilet.  It is important that you check your local building codes before installing toilet flange extensions, as some areas do not permit their use.

Some homeowners will stack additional wax rings to create height, but this will result in compression and, ultimately, leakage into the floor with every flush.  If you don't have 1/2" of flange clearance above the floor, you may end up with costly water damage to the floor and sub-floor.


Flange extenders are placed on top of the closet flange to achieve the appropriate height.

If the flange is new, check to ensure that it is clean.  If you are installing extenders onto an existing closet flange, scrub it well to remove any debris that would compromise a proper seal.

Depending on the extenders that you are using, you may or may not need to apply caulking between the closet flange and the extension (or between extensions) for proper sealing.  Read the packaging for your flange extenders thoroughly for individual instructions.

Once the caulking has dried and the wax ring has been installed, the toilet may be replaced and tested for leaks. 

Expert Insight

Leaks and water damage can occur if the toilet flange is not installed properly.

If you are installing toilet flange extenders, try to purchase one extender at the proper height rather than stacking several.  T\Although stacking is an acceptable practice, the additional layers allow more opportunity for leakage There are closet flange extenders available that do not require any caulking, as they have a self-sealing gasket.

These extenders avoid the additional step of caulking between layers, and allow you to move forward with the project without waiting for the silicone to set Some use flange extenders to stabilize their toilet if one of the bolts come free of the closet flange itself.  There are super flanges that fit over the original flange or partial metal rings that wrap beneath the flange to simplify this repair.

Using flange extenders to repair a broken closet flange is not wise and can lead to leakage. 

About the Author

Angela Herrie has been a freelance online content writer for over three years. She has been published on a number of popular sites, including Conceivable World, and writes on a wide variety of topics.

Photo Credits

  • Angela M. Herrie, US Public Health Image Library