Skip to Content

How to Fix the Gap Between Toilet and Wall [7 Methods For You!]

A gap between the wall and the toilet seems like the last thing that should be on your mind. But this problem is bigger than you think.

Many unhygienic problems arise because of it. And not only that it could potentially spoil the look of the bathroom.

Now is the time for you to stop stressing as we’ve got what you need.

Therefore, how to fix the gap between the toilet and wall? 

It may seem like one of the most confusing tasks, but trust it’s very simple. And the best thing is there are many ways you could achieve this. You can use an offset flange, caulk, expanding foam, wood and so much more. As you can see, if one option seems difficult, just choose another one. 

Still, The name of the methods might leave confusion. But we’re here to clear all that out for you. 

7 Methods to Get That Gap Fixed

We’ve given you not one, not two but seven methods to fix this gap. How to fix the gap between the toilet and the floor is a very common question. And for that, we’re here to help out!

Method 1: Using an Offset Flange

An offset flange is something that attaches the pipe. This tool makes sure that there is a proper distance between the wall and the toilet. 

When installing a toilet flange could end up too high. Hence, be careful when installing.

It could be really small but you won’t regret buying one. We have stated some good ones you can use! 


But be sure to keep in mind that a flange can be of two types. One is the offset flange itself and the other one is the standard flange. The difference between them is the way they are built. 

The one for the toilet is slightly angled and the other one is vertical. Having that cleared out, we’ll get into how you can use one. 

The first thing you need to do is remove the previous toilet bowl. Additionally, cover any places through which gas can exit the bathroom. You can use any type of cloth to block the parts from where gas might leave. 

And since you removed the old bowl. When installing a new bowl, be careful, the toilet bowl might leak.

The next thing you should do is to find a pipe that fits your flange best. A 3-inch or 4-inch PVC pipe should get the job done. When attaching the pipe guarantee that the pipe is not an obstruction. 

By obstruction, we mean that the waste flow should not be obstructed. Your next job is to put a new offset flange in its place. Before doing that, start making space for the new toilet flange. 

You can do this by removing the drain pipe by removing the screws or cutting. And don’t forget to remove the subfloor with a reciprocating saw. To fit the waste pipe into the offset flange one-step PVC cement is perfect.

But if PVC cement is unavailable you can work with a rubber footing to fix it as well. After installation of these two things, install the wax ring. Then finish by filling the gaps. 

Method 2: Waste Pipe 

This is a more expensive option. But decide for yourself whether you will use this option or not. And you can do that by analysing the procedure we’re about to explain below.

Firstly as usual the toilet bowl should be removed. As described above, start removing the toilet flange by removing the screws. After doing so, start locating the waste pipe. 

Once the pipe is found. The gap between the toilet and the wall can easily be cemented. By now you will be seeing holes because of pipe rerouting. 

Fill the holes with concrete. After filling the subfloor, put in the toilet flange alongside the toilet. And don’t forget to fix the bathroom floor. 

Method 3: Caulk 

This method can be used when the gap isn’t that far. The length can be less than ½ inch. And this can easily be filled with caulk. 

In case you don’t know what’s caulking, it is a type of material that fills any extra space. 

Before using caulk keep the area which is around the gap clean. And you can do this by using a putty knife. But if you don’t have a putty knife any other sharp material will do. 

We advise you to do this because you’ll see that the caulk will stick better. Run the caulk along the gap. And then make it smoother and be sure that no excess remains. 

Method 4: Expanding Foam

Another toilet gap filler is expanding foam. This method is quite simple and used for bigger gaps. You don’t need any specific instructions to use this.

But one precaution should be followed, that is, wear gloves. Because this is harmful to your skin. 

Method 5: Flange Repair Kit  

The repair kit will come with nuts and bolts. Afterward, lay the extension ring on top of the flange. This will ensure that it is level with the wall. 

And then fix the nuts and bolts in their place. 

Method 6: A Loose Toilet

If it turns out that your toilet is wobbling, it will easily create a gap. And when this is the case as usual tighten the bolts. 

Method 7: Using Wood  

No specific type of wood has to be used for this method. Just choose a wood that fits well with your bathroom. Cut the woods into perfect sizes that will fit at the back of the toilet.  

Then just slip the perfectly cut wood behind the toilet. This wood will cover up the whole gap. And even if it doesn’t, you can put pieces of small wood in the gaps. 

But this might not look good in your bathroom. What you can do is paint the wood the colour of your bathroom walls. This will make the wood look less noticeable. 

The Distance You Should Maintain Between the Wall and Toilet 

We should let you know the distance you should maintain. It is more important than you think. 

The gap between the toilet and the side wall should be 15-inch. But this measurement should not be done from the outer edge. It should be done from the centre point. 

It is recommended to sometimes decrease or increase the length of a newly installed toilet. Plumbers usually do this because drywall is needed afterward. The drywall is said to be ½ inches thick. 

And if no drywall is needed then increase the inch slightly. But if drywall is needed then decrease the length. 

The gap between the back wall and the toilet should be 12 inches. But from the toilet flange’s centre the measurement should be 12.5 inches. Measuring from the outer edge of the wall is a no for the installation of a toilet.

A 1-inch gap is recommended. Because some think a 2-inch gap between toilet and wall is okay to have. But this is completely wrong. 

You should also keep in mind the gap between the toilet bowl and the front wall. This gap should be around 21 inches from the front-facing wall. Then again if the space in the bathroom is small a 16-inch is alright. 

This measurement too should be measured starting from the toilet flanges centerline. And if you are thinking of saving space, avoid elongated toilets. In place of those, you can just use round toilet bowls. 

Don’t worry we have not forgotten about wall-mounted toilets. 12-inch is the ideal gap length for this type of toilet. And if you mess up the measurement then the toilet won’t fit against the wall properly. 

Wall-mounted toilets have problems of their own, but nothing that isn’t solvable!

Why Fixing This Particular Gap is So Important 

Does a toilet need to be against a wall? Yes! It most definitely does. 

There are many reasons for the importance of maintaining this gap. If you don’t, the gap can be a home to many moulds and bacteria. Closing the gap can keep these bacteria away. 

There’s also another problem that seems like it won’t happen but it does. And this problem is little children just being themselves. They could be curious and insert their fingers into this gap and get hurt. 

And the biggest problem is that insects and mice can come into your home from this opening. 


Given below are some commonly asked questions!

Can it be known if the toilet is 12 or 10 rough? 

Yes, you can. You can get the proper measurement by measuring from the centre of the rear bolt. 

Should every toilet remain at a similar distance from the wall?

Not exactly, as people put the toilets in the distance of their preference. But it is preferred for the toilet to be at a 15-inch distance. 

What are the benefits of an elongated bowl? 

One benefit is that it is considered more hygienic. With the surface being larger people tend to make less of a mess. 


We hope by now you know how to fix the gap between toilet and wall. If you ever see one, fix it as soon as possible. Because it will create many unnecessary problems for you.

Don’t stress it as it is not that difficult to fix.

Just be careful and good luck!