Top Tips for a Successful Toilet Flange Extension Installation

Top Tips for a Successful Toilet Flange Extension Installation


Toilet flange extension installation might seem like a daunting task, but with the right guidance and preparation, it can be a smooth process. A toilet flange is a critical component that connects your toilet to the waste pipe and the floor. When you need to install a flange extension, it typically means that your existing flange is too low or below the floor level due to various reasons like new flooring installation or previous plumbing errors. In this comprehensive guide, we will provide you with 1500 words worth of top tips for a successful toilet flange extension installation, ensuring a leak-free and secure connection for your toilet.

1. Gather the Right Tools and Materials

Before you start the installation process, gather all the necessary tools and materials. You will need a toilet flange extension kit, a wax ring, a new toilet bolt set, a hacksaw, a wrench, a screwdriver, a putty knife, a level, and a measuring tape. Having all the required items ready will save you time and frustration during the installation process.

2. Measure and Inspect

Start by measuring the height of your existing flange and the distance from the wall to ensure you get the right-sized flange extension. Inspect the existing flange for any damages or signs of wear. Addressing these issues before installation can prevent problems in the future.

3. Remove the Toilet

Turn off the water supply to the toilet and flush it to empty the tank and bowl. Disconnect the water supply line and remove the nuts from the bolts securing the toilet to the flange. Carefully lift the toilet and place it on an old towel or blanket to prevent damage.

4. Remove the Old Flange

Use a putty knife to remove the wax ring and clean the area around the flange thoroughly. If the old flange is damaged, use a hacksaw to cut it out. Be careful not to damage the waste pipe in the process.

5. Install the Flange Extension

Follow the manufacturer’s instructions to install the flange extension. Most extension kits come with detailed guidelines. Typically, you will need to slide the extension over the existing flange and secure it in place using screws provided in the kit.

6. Ensure Proper Alignment

Use a level to ensure that the flange extension is installed perfectly level with the floor. Proper alignment is crucial to prevent leaks and to ensure a tight seal with the wax ring.

7. Trim Excess Pipe

If the waste pipe is too long and protrudes above the flange extension, use a hacksaw to trim it to the appropriate height. Make sure the cut is straight and clean to allow for a proper fit.

8. Install a New Wax Ring

Place a new wax ring on the flange extension. The wax ring creates a watertight seal between the toilet and the flange, preventing leaks. Some wax rings come with a plastic horn that fits into the waste pipe, ensuring a secure connection.

9. Reinstall the Toilet

Carefully lower the toilet onto the flange extension, aligning the bolt holes with the slots on the sides of the flange. Gently press down on the toilet to compress the wax ring and create a tight seal. Install new bolts and nuts, tightening them evenly to secure the toilet in place. Avoid over-tightening, as it can crack the toilet or the flange.

10. Reconnect and Test

Reconnect the water supply line to the toilet tank and turn on the water supply. Let the tank fill, and then flush the toilet to check for any leaks. Inspect the base of the toilet and the connection to ensure there are no signs of water leakage.

11. Seal Gaps

If there are gaps between the flange extension and the floor, use a waterproof sealant to fill them. Proper sealing prevents water from seeping under the flange and causing damage to the subfloor.

12. Use Stainless Steel Bolts

When securing the toilet to the flange, opt for stainless steel bolts and nuts. Stainless steel is resistant to corrosion, ensuring a durable connection that won’t rust over time. This choice is especially important if your bathroom is prone to high humidity.

13. Consider a Reinforcement Ring

If your bathroom experiences heavy use or if you have a heavy toilet, consider installing a reinforcement ring around the flange. This additional support can prevent the flange from cracking or breaking under pressure, ensuring long-term stability.

14. Regular Maintenance

After the installation, perform regular checks to ensure that the toilet remains secure and leak-free. Inspect the area around the base of the toilet for any signs of water damage. Address any issues promptly to prevent further damage to the flooring and subfloor.

15. Seek Professional Help if Necessary

If you are not confident in your DIY skills or encounter difficulties during the installation process, do not hesitate to seek professional help. A licensed plumber can assess the situation and ensure that the flange extension is installed correctly, saving you from potential headaches and costly repairs in the future.


Installing a toilet flange extension is a task that requires attention to detail and careful execution. By following these top tips, you can successfully install a flange extension and enjoy a leak-free and secure connection between your toilet and the waste pipe. Remember to gather the right tools and materials, measure and inspect the existing flange, remove the toilet carefully, install the flange extension with proper alignment, use a new wax ring, and test for leaks after reinstallation. Regular maintenance and addressing issues promptly can prolong the lifespan of your toilet flange and prevent costly repairs down the line. If you encounter difficulties, do not hesitate to seek professional assistance. With the right approach and knowledge, you can ensure a successful toilet flange extension installation that will serve you well for years to come.