A wobbly toilet, frequently caused by an uneven bathroom floor, can lead to water damage if left unattended. Proper usage of a leveling tool is critical for fixing the problem. The steps to how to level a toilet are achievable by a novice DIYer, but can lead to serious damage if not completed correctly. The goal of every homeowner when experiencing such problems is to find and implement the most proper solution.

Image taken from the YouTube channel DIY Plumbing Guy , from the video titled How to Set a Toilet on an UNEVEN Floor (NO SHIMS-NO CAULK NEEDED) .
Toilet Trouble? Master Leveling Like a Pro!
Is your toilet wobbly, rocking, or generally unstable? An unlevel toilet is not just annoying; it can lead to leaks, cracks, and even damage to your flooring. This guide will walk you through the process of leveling your toilet like a professional, saving you money and potential headaches down the road. We’ll focus on the essential question: how to level a toilet.
Understanding the Problem: Why is My Toilet Uneven?
Before diving into the fix, it’s helpful to understand why your toilet might be unlevel in the first place. Several factors can contribute:
- Uneven Flooring: This is the most common culprit. Floors can settle over time, creating dips and slopes.
- Inconsistent Flange Height: The toilet flange (the metal or plastic ring connecting the toilet to the drainpipe) might not be perfectly flush with the finished floor.
- Loose Bolts: Over time, the bolts holding the toilet to the flange can loosen, allowing the toilet to shift.
- Toilet Manufacturing Imperfections: Although rare, some toilets may have slight imperfections in their base that contribute to instability.
Gathering Your Tools and Materials
Having the right tools on hand makes the job much easier and ensures a professional-looking result. Here’s what you’ll need:
- Level: A standard bubble level, preferably 2 feet long, is essential. A torpedo level can also be useful for tight spaces.
- Toilet Shims: These are wedge-shaped pieces of plastic used to fill the gaps and stabilize the toilet. You can find them at any hardware store. Wooden shims can also be used, but plastic shims are more resistant to moisture and rot.
- Utility Knife or Scoring Tool: For trimming the shims after they’re in place.
- Adjustable Wrench or Pliers: To tighten the toilet bolts.
- Caulk (Optional): To seal around the base of the toilet after leveling. Use a waterproof, mildew-resistant caulk.
- Gloves: To protect your hands.
- Shop Towels or Rags: For cleaning up any spills.
The Leveling Process: A Step-by-Step Guide
Now let’s get to the core of the matter: how to level a toilet. Follow these steps carefully for the best results.
Step 1: Assessing the Wobble
- Identify the Problem Areas: Gently rock the toilet back and forth to identify where the gaps are located. Note the direction and severity of the wobble.
- Use the Level: Place the level on the toilet bowl rim, both front-to-back and side-to-side. This will confirm the unlevel areas and help you visualize where shims are needed.
Step 2: Inserting the Shims
- Placement is Key: Carefully slide the shims into the gaps between the toilet base and the floor. Start with the largest gaps first.
- Multiple Shims: You may need to use multiple shims stacked on top of each other to achieve the correct height.
- Iterate: Continue to check the level as you insert shims. The goal is to eliminate the wobble and ensure the bubble in the level is centered.
Step 3: Securing the Toilet
- Tighten the Bolts: Once the toilet is level, gently tighten the bolts at the base of the toilet. Avoid over-tightening, as this can crack the porcelain. Tighten them a little at a time, alternating between bolts to apply even pressure.
- Recheck the Level: After tightening the bolts, recheck the level to ensure the toilet hasn’t shifted. If necessary, readjust the shims.
Step 4: Trimming the Shims
- Clean Cuts: Use a utility knife or scoring tool to carefully trim the excess shim material. Score the shim first, then snap it off.
- Flush to the Base: Trim the shims as close to the base of the toilet as possible for a clean, professional look.
Step 5: Caulking the Base (Optional)
- Apply Caulk: If desired, apply a bead of caulk around the base of the toilet where it meets the floor. This will help prevent water from seeping underneath and can further stabilize the toilet.
- Smooth the Caulk: Use a wet finger or a caulking tool to smooth the bead of caulk.
- Cure Time: Allow the caulk to dry completely according to the manufacturer’s instructions before using the toilet.
Troubleshooting Common Issues
Even with careful planning, you might encounter some challenges:
- Rusty or Stuck Bolts: If the bolts are rusty or stuck, apply a penetrating oil and let it sit for a few minutes before attempting to loosen them. If they still won’t budge, you may need to cut them off with a hacksaw.
- Broken Flange: If the flange is cracked or broken, it will need to be replaced before you can properly level the toilet. This is a more complex repair that may require a professional plumber.
- Persistent Wobble: If you’ve tried everything and the toilet still wobbles, the floor may be significantly uneven. In this case, you may need to consult a professional to level the floor.
A Table of Shim Placement Strategies
Understanding where to place shims is critical. This table outlines common scenarios and where to insert the shims.
Symptom | Likely Shim Placement | Explanation |
---|---|---|
Toilet rocks forward/back | Under the front or back of the base | Floor is likely sloping in that direction. Use shims to raise the low point. |
Toilet rocks side-to-side | Under one side of the base | Floor is likely sloping to one side. Shim the low side to bring the toilet level. |
Toilet wobbles in all directions | A combination of positions needed | Floor is highly uneven; address each low point individually, checking the level frequently. |
One corner clearly off | Directly under that corner | Focus shims here first, then check if other areas need minor adjustments. |
Toilet Trouble? FAQs: Leveling Up Your Toilet Skills
This FAQ section provides quick answers to common questions about leveling a toilet and fixing related issues.
Why is my toilet wobbly?
A wobbly toilet is often due to uneven flooring or loose bolts connecting the toilet to the floor flange. This can cause leaks and potential damage to your plumbing.
How do I know if I need to level a toilet?
If your toilet rocks back and forth, leaks at the base, or you’ve noticed water damage around the floor, it’s likely time to level your toilet. Placing a level on the toilet rim can also confirm unevenness.
What’s the best way how to level a toilet?
Shims are the most common solution. Place plastic shims between the toilet base and the floor where the rocking occurs. Gently tighten the bolts after inserting the shims until the toilet is stable and doesn’t rock. Avoid overtightening.
What if shimming doesn’t solve the problem?
If shimming doesn’t completely stabilize your toilet, you might have a damaged flange or subfloor issue. In that case, consulting a plumber is recommended for further inspection and repair. They can assess whether more extensive repairs are needed beyond simply how to level a toilet with shims.
So there you have it! Hopefully, you’re now armed with the knowledge to tackle how to level a toilet like a pro. Go forth and fix that wobble!