Small bathroom with toilet and shower in gray tones

Bathroom Under-Stairs Toilet Ideas

As it’s becoming increasingly more common for homeowners to want to renovate the unused area beneath their staircase into a toilet, we’re here to give you some tips and inspiration so that you too can make the most of your home’s every corner. Depending on the room’s footprint, you will either be able to install a straightforward, practical suite with a sink and toilet or you can opt for a cloakroom suite. We have compiled some of the very best ideas for fitting a new toilet in your house to give you the motivation you need to transform that unused space into a luxurious, functional bathroom suite.

We’ll begin by talking you through some of the key elements to take into consideration when you’re in the planning stages; how to fit a suite underneath your staircase, the dimensions you’ll require, as well as a few of our top tips on utilising every centimetre effectively. Following on from that, we have covered the main considerations that come with the task of fitting a new small-scale toilet; the water supply, ventilation, and the types of fixtures you can realistically expect to work with in such a minimal footprint.

At the end of this blog post, you’ll see that we have compiled some of the most frequently asked questions which crop up time and time again. Using our expertise here at Bella Bathrooms, we’ve answered your questions to help give you that extra bit of guidance and get you on your way to having a brand-new toilet to replace that cluttered cupboard you rarely use.

Toilet Under-Stairs

Most houses have a staircase and so transforming that unused space into a downstairs toilet is a great way to make the most of your home’s square footage. On top of the benefits which come with installing a new toilet, it’s also worth noting just how practical they are; if you have children or elderly family members, a conveniently located toilet is a great addition to your house.

We have a range of toilet suite items designed with small spaces in mind so take a look at the ways you can strike a balance between functionality and style. When it comes to decorating, we’d recommend that you avoid using dark colours or excessively ornate patterns as this will make the walls feel closer together and lead to an overly crowded feel. Neutral colours and whites paired with simplistic fixtures will do wonders for creating the illusion of spaciousness.

Under-the-Stairs Measurements

The footprint beneath your staircase is going to play a big role in determining whether or not it’s going to be plausible to fit a suite there. For a comfortable layout, we would recommend that you only renovate spaces measuring a minimum of 70cm in terms of width and 130cm in length. Make sure to account for the sloped ceiling which comes as a result of the shape of the stairs above too – you want to be able to stand upright with ease to prevent using the toilet becoming an awkward and difficult experience each time.

How to Maximise Space

There are a few ways you can go about maximising your space when you’re wanting to install suite items such as a toilet under-stairs. Let’s take a look at three of our best suggestions and some of our favourite products which will work well in confined quarters.

1) Try using a wall-mounted sink

When you’re looking to save space, wall-hung fixtures are a great solution. A wall-mounted sink is attached to the wall without a vanity unit or pedestal below it. Suspended units give the illusion of your room being more spacious as there’s an increased amount of floor visible. They won’t protrude out into your space as far as a regular suite item either, making them highly effective under-stairs.

Take the RAK Cloud Matt White Wall-Hung Washbasin for example; this compact basin sits suspended and takes up a minimal amount of square footage. Crafted from high-quality vitreous china and boasting a pristine white shade, this is a contemporary basin which will fit in a small space much better than would be the case with a regular washbasin that would ultimately end up dominating your other suite items.

2) Use a built-in mirror with storage

When you’re working with a restricted amount of square footage, the last thing you want is clutter taking up that all-important space. Opt for a mirror which either incorporates shelving or conceals a storage cabinet. Mirrors are not only a functional fixture, but they will make even the most confined of spaces seem more spacious and airy; they create the illusion of the toilet being more expansive while simultaneously reflecting natural and artificial light around the room.

Here at Bella Bathrooms, we have a variety of mirrored cabinets to suit every style. The Croydex Anton Cabinet is minimal in its size, yet provides a substantial storage solution and has an elegant mirrored glass door. Alternately, you could maximise your space even more by opting for the HiB Minnesota Cabinet. This cabinet will make use of that awkward corner by creating a practical place to store your toiletries while the door acts as a mirror with an ambient illumination to enhance your space.

3) Toilet and sink combination

A combined toilet and sink is a great way to save space. By having both the toilet and the washbasin in one single unit, you’ll be able to utilise every square foot you have available and even open up the possibility of fitting other pieces such as a shower enclosure or a half-bathtub. Designed for cloakrooms and en-suites, these combined units are a brilliant under-stairs toilet solution.

This Nuie Stone Grey Suite has an integrated toilet and sink; with a short projection of only 360mm and a width measuring just 503mm, this is a compact solution which covers all the bases. If you have a slightly more generous footprint to work with, a cloakroom set such as Nuie’s Gloss White Furniture Pack which measures 920mm in width is a versatile, contemporary fixture which is designed to be both space-saving and lavish.

Under-Stairs Toilet: Ideas & Things to Consider First

When it comes to fitting a brilliant under-stairs toilet, there are a few ideas/things to consider. First of all, you’ll need adequate ventilation and you’ll also want to identify any potential construction issues you might encounter when renovating the space. Once these considerations have been made, you can go on to select specific suite items which may even include a bathtub. Let’s talk through each of these points to give you some more insight and inspiration.

Have you thought about ventilation?

As it’s unlikely that your toilet under-stairs will have a window, you will need to make sure that you have adequate ventilation. We would recommend fitting an extractor; this will reduce any issues such as damp which results from condensation or excessive moisture. You’ll be able to choose between wall-mounted extractor fans and ceiling extractors depending upon your preference and the layout you’re working with. We would suggest opting for an extractor which automatically powers up when the lighting is switched on for added convenience.

This HiB Cyclone LED Extractor Fan fits to the ceiling and comes in either chrome or white to complement your pre-existing fixtures for a sense of continuity. This is an efficient extractor which will eliminate any issues stemming from excess condensation and by improving the ventilation of the room. It also features an LED light for a stylistic touch.

If you would rather have a wall-mounted extractor then we would recommend the HiB Breeze Extractor Fan; its sleek chrome finish will work well with your other suite furniture while providing that much-needed ventilation.

Possible Plumbing Issues

Due to the fact that the area under your stairs is unlikely to have been designed to include the plumbing required for a toilet, you may need to fit the water supply by lifting up any floorboards and installing new pipes. Likewise, you’ll need to fit a pump to handle the toilet’s waste. Ensure that you hire a reliable plumber who can effectively carry out the necessary installation you will require – this will reduce the chances of having any unforeseen issues pop up in the future too.

Bathtub fitted under the staircase

In some cases, you may well be able to fit a bathtub under your staircase. In the section directly below the staircase, you’ll notice that you’re left with an inconvenient space that is often very low in height. Installing a bathtub is possible in these cases and the slope of the stairs makes for a symmetrical appearance in this portion of your space.

You’ll probably find that a half-bath is your best option as they’re smaller in their proportions. Ensure that the bathtub won’t be awkward to access, you don’t want it to end up being a totally unusable fixture! Overall, a bathtub is a little more realistic than choosing to install a showering enclosure because you’ll likely have to navigate a very low or difficultly-angled ceiling.


We know that you’ll have a few questions that need answering before you can turn the area below your staircase into a functioning toilet. For this reason, we’ve compiled a list of the most frequently asked questions so that you can use our answers to come up with the very best ideas for your toilet under-stairs.

Can I have a toilet under my stairs?

As you have probably already gathered from reading this blog post, having a toilet under your stairs is indeed possible. It’s a great way to utilise the space underneath your staircase. With the correct construction work, the necessary ventilation, and fixtures which have smaller-than-average measurements, you will be able to fit a toilet under your home’s stairs.

Of course, there are a number of considerations you’ll have to account for first, the most important being the overall layout of the space you’re looking to convert. In addition, you’ll need to make sure that you have the appropriate building work permission if it’s required and the necessary budget to cover all your costs.

Can you put a half-bath under a staircase?

A half-bathtub has a small footprint so can fit nicely under your staircase provided you have the correct dimensions to work with. If your staircase is a generous width then it’s definitely worth considering the installation of a tub for an added sense of luxuriousness in your home.

How much space do you need for a toilet under the stairs?

At a very minimum, you’re going to want a space that measures 70cm in width and 130cm in length. For a comfortable space that isn’t awkward to use, a layout of around about 80cm x 140cm will give you a bit more room to play with. A toilet under-stairs will require a door that swings outwards rather than into the room itself, so take care to bear this in mind when you’re putting your plans together.

How do you decorate a small downstairs toilet?

Decorating a small toilet necessitates some careful planning. The best ideas will seek to optimise every centimetre of the space you have so keep an eye out for wall-hung items; avoid having a toilet on the floor itself and instead have a suspended fixture such as the RAK Metropolitan Wall Hung WC. This toilet is mounted to the wall and makes your flooring appear larger, meaning it will be a much better option when you’re looking to save space than would be the case with a standard toilet. Use a bright white to off white colour scheme to decorate the walls with as this will make the room seem less confined. Similarly, hanging a mirror will enhance your space so that it appears larger. Aim for a minimalist look to prevent the room from feeling cramped and uncomfortable.