Leveling a Toilet on Uneven Tile: A Comprehensive Guide
Encountering an uneven tile surface when installing or leveling a toilet can be a common yet challenging issue. However, with the right techniques and tools, you can achieve a perfectly level toilet that ensures comfort and proper functioning. This guide will walk you through the process, from diagnosis to execution, ensuring a professional and durable outcome.
Understanding the Problem: Why is My Toilet Uneven?
Uneven tiles can cause your toilet to wobble or sit at an angle, leading to discomfort and potential damage. This issue often arises due to improperly installed or cracked tiles, or simply because the subfloor is not perfectly level. Before you begin leveling your toilet, it's crucial to identify the cause of the unevenness to ensure your solution is effective and long-lasting.
Inspecting the Tiles
Begin by examining the tiles around the toilet. Look for cracks, loose tiles, or any signs of damage. If the tiles are the cause of the unevenness, you may need to repair or replace them before proceeding. If the tiles appear intact, the issue might lie with the subfloor.

Checking the Subfloor
To check the subfloor, carefully remove the toilet (if it's not already) and inspect the area beneath. A level or a long straight edge can help you identify any dips, humps, or unevenness in the subfloor. If the subfloor is the culprit, you'll need to address this issue before installing the toilet.
Gathering Your Tools and Materials
Before you start leveling your toilet, ensure you have the necessary tools and materials. Here's a list to help you prepare:
- Toilet leveling shims
- Crescent wrench
- Adjustable wrench
- Screwdriver (flathead and Phillips)
- Level
- Tape measure
- Caulk gun (optional, for touch-ups)
- Caulk (optional, for touch-ups)
Leveling the Toilet: Step-by-Step
Now that you've identified the cause of the unevenness and gathered your tools, it's time to level your toilet. Follow these steps for a professional result:

Preparation
Before you begin, ensure the area is clean and dry. If you've removed the toilet, make sure the bolts are still in place and that the wax ring is undamaged. If the wax ring is damaged, you'll need to replace it to ensure a proper seal.
Installing the Toilet Leveling Shims
Toilet leveling shims are designed to fit between the toilet's mounting bolts and the floor, allowing you to adjust the toilet's height and level. Start by placing the toilet back onto the bolts, ensuring the bolts are properly aligned with the mounting holes in the base of the toilet.
Using the level, measure the toilet's levelness from side to side and front to back. If the toilet is not level, you'll need to install shims to correct the unevenness. Place the shims under the low side or corner of the toilet, using the level to ensure you're adding the correct amount of shim to achieve a level toilet.
Securing the Toilet
Once the toilet is level, secure it by tightening the mounting bolts using a crescent wrench. Be careful not to overtighten, as this can cause the bolts to strip or the toilet to crack. Instead, tighten the bolts until they're snug, then use an adjustable wrench to give them a final, firm twist.
Testing the Level
After securing the toilet, double-check its levelness using the level. If the toilet is still not level, you may need to adjust the shims or, in rare cases, replace them with thicker or thinner ones to achieve the perfect level.
Caulking (Optional)
If you've had to remove the toilet to level it, you may notice that the caulk around the base of the toilet has been disturbed. To create a clean, finished look, apply a new bead of caulk around the base of the toilet using a caulk gun. Allow the caulk to dry completely before using the toilet.
Preventing Future Issues
To prevent future leveling issues, ensure your subfloor is in good condition before installing the toilet. If necessary, hire a professional to repair or replace any damaged or uneven sections of the subfloor. Additionally, regular maintenance and inspections can help you catch any potential issues early, saving you time and money in the long run.
In conclusion, leveling a toilet on uneven tile can be a straightforward process with the right knowledge and tools. By following this guide, you can achieve a perfectly level toilet that ensures comfort, proper functioning, and a professional, finished look.