What Are Tiny House Toilet Dimensions? (3 Amazing Examples)

Every single inch of space in your tiny house bathroom matters. Wherever the opportunity arises to save an extra inch or two here and there, it must be taken.

So, can you really downsize your toilet?

We’re here to discuss how different tiny house toilet sizes can save you some extra room in your home. We’ll compare composting toilet dimensions to compact flush toilets and incinerator toilets, as well as how much space you need to house them.

Table of Contents:

What are tiny house toilet dimensions?

As long as you have space in your bathroom to fit a toilet and the associated plumbing, tiny house toilet dimensions and sizes can be the same as in any other home. However, if you are short on space, compact designed toilets are available. 

You may also want to consider whether you want to use a flush toilet or a composting toilet. 

Of course, flush toilets in tiny houses will have additional toilet plumbing associated as they need to connect to a sewer system, which can take up more space. 

What are flushing toilet dimensions?

As the tiny house movement has continued to surge in popularity and many more people are choosing to downsize, the demand for compact flush toilets has increased.

Toilet manufacturers have created compact variants to meet this demand. 

Compact flush toilets in tiny houses obviously have smaller dimensions compared to regular size toilets.

We’ve researched seven different flushing toilets available on Amazon to find out how compact they really can be. Here are the results:

Flush tiny house toilet dimensions

We’ve taken the largest and smallest of the seven toilets and also the mean and median average.

As you can see, the smallest tiny house flush toilet dimensions we found were no more than 20 inches in length, width or height. 

The advantage of flush toilets is that the seat can be made very small, as long as there is room to sit and for waste to be flushed through. An extra consideration that must be made is the additional plumbing required to house a flush toilet.

What are composting toilet dimensions?

Composing toilet sizes are different to flush tiny house toilet sizes. This is because they require more space beneath the toilet seat to store waste and break it down.

Similar to flush toilets, we researched five different composting toilets available to purchase. Here you’ll find some interesting differences between the two:

Composting tiny house toilet dimensions

The measurements marked in red are where the flush tiny house toilet dimensions were smaller than the composting toilet dimensions. 

The ones marked in green are where the composting toilet was smaller than the flush toilet counterpart. 

The composting toilet dimensions we found were, on average, less than 30 inches in length, width and height.

As you can see from the color comparison, the composting toilet dimensions are generally larger than the same flush toilet dimensions, especially when it comes to width and length.

This is because a larger area below the seat is needed for the compost chamber.

However, the average height of the composting toilets we found was lower than the average height of the flush toilets. This is mainly because composting toilets do not have a large tank above the seat like flush toilets.

What are incinerator toilet dimensions?

Incinerator toilets are the final model on our list. They are similar to composting toilets in the fact that they are waterless. But how do their sizes differ?

Incinerator toilets are of similar size to composting toilets as they both have compartments below the seat to break down waste. But are they smaller than compact flush toilets?

We researched five different incinerator toilets available for purchase online. Here you’ll find some interesting measurements:

Incinerator tiny house toilet dimensions

We’ve color-coded the above table like before. This shows a comparison between incinerator toilets and flush toilet dimensions. 

As you can see, the incinerator toilets we’ve compared are generally longer than flush toilets. This may be due to the fact that urine and faeces must be separated upon entering the toilet and stored separately (so more space is required).

The incinerator toilet dimensions we found were, on average, less than 25 inches in length, width and height.

Gas is sometimes used to power incinerator toilets, and if this is kept in-situ, more space is also required. 

However, the right column of the table shows a clear advantage when it comes to height. Similar to composting toilets, since it is waterless, no tank above the seat is required.

How much space do you need for a composting toilet?

Composting toilets are very popular in tiny houses. Since it is an essential part of your bathroom, you need to make sure there is enough space to be able to access the toilet.

If you also have a shower stall inside your tiny house bathroom, it should be long enough to incorporate a composting toilet. 

The smallest tiny house bathrooms tend to be no less than 8 feet wide by 30 inches long. This is because a small shower stall (30 inches in length) stretches from wall to wall. However, 30 inches in length is enough space to fit a tiny house composting toilet.

This is apparent in the Bister Tiny House, where the bathroom is no longer than the shower stall. There is even space beside the toilet and above to provide extra storage. 

In bathrooms like this, the toilet is positioned sideways so that it uses the width of the room to its advantage. 

Another consideration you may need to make, however, is how much room is required for you to empty the toilet. This is one reason that you need space in front of your composting toilet and again, why it is facing lengthways in the Bister Tiny House.

Lastly, you need to consider the space required between other appliances in your bathroom. Making sure you can access the sink/vanity or shower after the toilet is installed.

For flush toilets, the placement of the toilet may be slightly more restricted since plumbing is required. However, the same considerations must be taken to ensure there is enough space to use and repair the toilet.