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Estimated Cost To Install An Understairs Toilet

Are you thinking of installing an understairs toilet?

If you have a staircase within your home, then contemplate converting it into an under-stairs toilet. There are many benefits to the work being completed, such as practicality, ease of use and adding value to your house.

If you’re trying to figure out what you can do to install toilets in your basement you’ve found the right spot.


How Much Does it Cost to Install an Understairs Toilet?

Toilets under stairs help make hosting and entertaining easier as there is always a toilet nearby. Also, you won’t have to worry about having your bathroom accessible for guests.

It is possible that you do not need additional baths or showers but having three or more toilets can make a huge improvement to a house as compared to one. The addition of a second bathroom could increase the value of your home.

In this article we’ll go over various prices for installing an understairs toilet. So if you’re planning to have one installed within your home, this is the place to find out the amount you must plan to spend for the project

What would it cost to build an understairs toilet, if you’ve decided that this is the best choice for you?

The answer will depend on a number of aspects.

  • If you’re looking to renovate an existing understairs toilet, or creating one new toilet, you’ll need to consider the dimensions of the bathroom will determine the larger it gets with more materials and time required to finish the project
  • A home addition or existing space? Are you planning to modify your existing home by including a new toilet? It’s certainly cheaper than building an extension for your home.
  • The proximity of the proposed bathroom to the plumbing. The farther away the bathroom is greater the distance, the more expensive the price

The price of putting in the new toilet beneath your stairs can vary between £1,000 and £3,000 depending on the amount of work needed.

For instance, you might require a wall to block off the space under the stairs or even build a window or you may have a space in which everything is in the first place.

Fittings and fixtures are other elements in this task and you should consider whether you would prefer the most affordable product from the DIY store that is about £50 or more elegant.

The typical cost of installing a toilet under stairs is around £650 for the materials and £600 for labour. Keep in mind that the cost of groundwork could be around £300 and soil removal is expected to be priced around £100.

It is crucial to keep in mind that this price can change in accordance with your specific situation.

Understairs Toilet Prices

The table below breaks down the cost of adding an under-floor toilet in your home:

Understairs ToiletCost
New toilet under your stairs£1,000 – £3,000

What are the Supply Costs for an Understairs Toilet Installation?

When it comes to the things we’d like to invest our money on, the installation of a new toilet is at the end of the line.

It’s not a particularly attractive thing and it’s not the kind of thing you’d want to see depicted in your favourite decor magazine. And then there’s the problem of plumbing, as well as the associated expenses.

But, making the new “minimal space” using the space you have inside your home is an excellent option to increase the value of your living space while increasing its value. house.

Ample airing cupboards, the space under the stairs and corridors can be used as an additional toilet.

In this article, we will review the different costs of supplies needed for installing an understairs toilet, if you decide to build it yourself or do the work yourself and purchase your own equipment.

In the beginning, you’ll need accessories, such as towels, rails and toilet roll holders. The items will cost £50 or £70 based on the quantity you’d like to spend. Additionally, you’ll require an appliance that costs between £50 or £200.

A new toilet is priced between £100 to £200. The new bathroom taps may likely cost somewhere between £40 and £100 and new floor tiles are priced somewhere between £10 to £20 per square meter.

The table below goes over the cost of supplies for an under-stairs toilet installation:

Accessories£50 – £70
Sink£50 – £100
Toilet c£100 – £200
Bathroom taps£40 – £100
Floor tiles£10 – £20 per m2

What are the Additional Costs of Installing an Understairs Toilet?

Because of the many trades and activities that can go along in the process of installing a bathroom downstairs There are a myriad of additional expenses that need to be taken into consideration when installing an under-stairs toilet. We’ll discuss the various costs involved here.


A plasterer is required for boarding, skimming walls as well as skimming ceilings.

The primary element that can affect costs of plastering can be determined by the dimension of the space to be plastered, regardless of whether it’s a wall in the smallest space or multiple ceilings and rooms in a huge house.

The plasterers will analyse the task and take into consideration any important factors before estimating how long it will take and the amount of material required. Naturally, the price of the plastering process will be determined by the amount, as well as the complexity of the job.

The cost of a patch repair could be between £70 and £130. A re-skimmer could cost between £150 to £200 and varies based on the size of the wall and a full plastering project could cost twice more.

A basic skimming task in a moderate space could cost between £400 or £500 without VAT and other charges, whereas a complete plastering job will cost about £700 or £800.

Plasterers typically cost £6 to £10 per square meter of wall area as well as 

daily fee of £100 or £150.

The prices obviously differ according to how long the task takes. This is usually just one or two days for small repairs, and between two and three days for the plastering and skimming of the walls.

Certain plasterers may be charged a per-day rate that varies based on the location you reside in For instance, plasterers from London generally charge around £200 per day, whereas artisans in the areas around them typically cost between £140 and around £160 per day. The cost of a professional per day will vary based on their abilities.

Painter and Decorator

You’ll require a person to paint the ceiling, walls and skirting boards along with the architraves and doors. The cost for painting and decorating tasks can differ greatly based on the type of work involved.

Painting and decorating can cost between £160 to £180 per day, on average, with prices in London likely to be a little higher.

But, speaking with a professional painter about the standard charges for decorators and painters is a good way to begin. The majority of day-time charges vary between £150 and £200 daily.

The walls and ceiling of a tiny room (2.2m in size 2.4m) is priced between £200 and £250 and should take less than a day.

The price of the project is also influenced by the size of the space. It is because of the massive amount of materials required. In the end, you should expect to spend between £200 and £300 to furnish a tiny space.

The cost of various jobs can vary in relation to accessibility or the task that is involved. For instance wallpapering a room could cost between £250 and £500.

Installing Flooring

Floor fitting is necessary for fitting tiles or vinyl flooring and the necessary floor preparation work. The typical flooring installation cost is between £400 to £1,000, in the majority of instances.

The price of installing new flooring however it will differ based on the type of flooring that you would like to install as in the dimensions of the space.


To construct, install thermal insulation as well as fitting skirting boards to architraves and hanging doors, you’ll need an expert joiner.

In the UK The average hourly wage for a joiner is between £20 to £40. The cost of a carpenter and joiner typically are about the same.

Skip Hire

The cost to hire for a two-yard skip is £70 or £100 for a four-yard skip costing about £100 or £160 and the cost of a 6-yard skip is between £120 and £190.

A 8-yard skip is priced between £150 and £370 The 10-yard skip costs between £180 and £410 and a 12-yard skip will cost between £220 to £450.

A 14-yard skip is priced between £230 to £460 A 16-yard skip is priced between £240 to £480 A 18-yard skip is priced between £280 to £500 while a roll-on roll-off skip is priced between £300 to £500.


As the costs of tradespeople differ across the nation The price of installing an under-stairs toilet is different according to where you live.

Costs of employment in the southeast region, on the contrary, tend to be greater than average for the country, and are higher in London. However, the costs generally are lower in the northern part of England, Scotland, and Northern Ireland than in the other areas of the country.

Amount of Tradespeople

The price of installing an under-stairs toilet is determined by the amount of tradespeople that are required to install it, which will be determined by the type and size of toilet that is desired. The higher the number of tradespeople needed to install the toilet, the more expensive the installation is likely to be.


The more expensive the labour cost is, the longer it will take to put in the downstairs tile. The longer the time is, the higher the price you’ll be charged for it, as some homeowners will need to contract labourers for a couple of days, a few weeks or even months.

Tradesmen Costs for an Understairs Toilet Installation

Hiring tradesmen is the most secure method of installing an understairs toilet because it provides confidence that there won’t be any issues. Therefore, it’s recommended to hire labourers to finish the job.

In this article, we will review the various tradesmen’s costs for installing an undersized toilet to get an idea of the amount you will have to pay.

Installation of a new toilet and a hand basin with cold water outside and both connected to the plastic soil stack including the basin and flush water being supplied by the in-coming water supply. Two men over two days. £400-£650.

Install a wall of studs or a cubby hole in the bathroom. Install an opening that leads from the hallway into the space that is now enclosed. Repair the plasterboard as well as over your new toilet. Install architrave and skirting. Two days or more with two people costs somewhere between £300 to £700.

Installing new double-glazed windows can cost between £200 and £220, and the connection of hot water to the basin will cost you £325 to £350. It costs £375 or £400 for the labourer to install a small radiator using a TRV.

Installing a downlight as an internal pull switch will cost between £200 and £230 the installation of an extractor fan is priced between £150 and £200.

An electrician could cost between £150 and £200 for the installation of cables, pipework and meters. It will cost £900 or £1,000 to dig the new hole, connect the waste underground, and finish with two people in three days.

The cost to hire plumbing professionals varies based on the location you live in and also the kind of service you offer. Based on our research the typical plumber will charge between £40 to £80 each hour.

The day rates for plumbers range between £180 up to £350 per day, but you can expect to pay 20-30 percent more per day when the plumber has installed an appliance inside your home.

Plasterers generally cost between £6 and £10 per square meter of wall area, In addition there is daily fee of £100 and £150.

Prices will, naturally, vary depending on the length of time the task takes. This usually takes just one or two days for small repairs, and between two and three days for the plastering and skimming the wall.

The typical cost for hiring a decorator and painter generally ranges between £100 and £300 for large decor jobs such as wallpapering and painting multiple rooms.

The table below breaks down the overall labour costs for installing an underneath toilet.

Toilet new and water cold tap outside£400 – £650
The installation of a stud wall behind the toilet.£300 – £700
Installation of new double-glazed windows£200 – £220
Connection of hot water and the sink£325 – £350
Radiator£375 – £400
Switch and light£200 – £230
Extractor fan£150 – £200
Electrician£150 – £200
Plumber£40 – £80/hour
Plasterer£100 -£150 per day
Painter and decorator£100 – £300 per day

How Long Does It Take to Install a Toilet Under the Stairs?

The ability to maximize space in a typical family home is an everyday problem for homeowners. The shoe cabinet underneath your staircase On the other hand is a space that is often neglected that could provide a tremendous storage space or even an entire space.

While there are a myriad of creative ideas for understairs toilets to improve the bathroom, every house is distinctive, and specific changes are more efficient than others. We’ll discuss how long it will take to put a toilet in the stairs to let you know the length of time the process will last.

There’s usually more to it than just hiring an expert plumber for a couple of days. This is why a turnkey service is a great option.

Easy jobs in which you have the room available and the plumbing is straightforward can take plumbers a week. The more complicated jobs that involve a number of tradespeople could require two weeks or more. The job could, for instance, involve:

  • Rooms are moved through and raised the floor levels
  • Doors to the Coal shed are being built
  • The transfer of an appliance
  • Excavating the driveway to set up drainage pipework
  • The cast-iron stack is being replaced by a new soil stack
  • Gas meters, for instance, are being moved
  • Installing new studs, then insulating them, and then boarding them up
  • Installation of a doorframe, hanging doors, and installing skirting and architraves
  • Electricity is used extensively
  • Plastering
  • Painting and decorating
  • Plumbing

If you are planning to install a toilet beneath the stairs, you’ll require building permits. There is no specific plan to review and then approve the building Notice application, and you are able to begin construction when the notice is approved, generally in less than 48 hours.

An application for a Full Plans application necessitates an exhaustive review of the plans prior to them being deemed acceptable. In law, councils must make a decision to approve an application within five weeks from getting it, though the process is generally much quicker.

Plans for building are approved for three years. In the event that you do not start working within the specified time the council may serve you with a notice that declares the plans “of no effect,” which will require you to file a new application.

A plasterer should take one to two days to put down your bathroom under the staircase. The length of time required for the decorating task is crucial because many contractors charge per hour. Thus, knowing the length of time the job will take you will help decide on the cost.

If you’re having a bedroom that is small painted, it shouldn’t take about a day. However in the event that you need to remove paint or wallpaper taken off, this can take an additional day.

The installation of flooring can take between 3 and 6 hours.

This table will break down the time:

Installing the toilet downstairsTwo weeks
Permission to planTwo weeks
Plastering1 2 days
Decorating and paintingOne day
Flooring6-8 hours

Types of Toilets

You might be shocked to find out that there exist different types of toilets available within the industry. Regarding the appearance, size as well as functionality and sanitation, they’re each unique.

Toilets of these types differ in cost as well as effectiveness, therefore being aware about them can help you pick the most suitable toilet design to fit your needs.

We will discuss the different types of toilets, so you can choose which is the best one for your needs beneath the stairway toilet.

Flushing Toilet

An easy explanation is that when you press a button, or pull the trigger, water is pushed through the pipeline. And then there’s the toilet that flushes. A unique aspect of flushing toilets is the trap’s “S, P, U, J” shape.

If there’s a toilet that is available in today’s society, it’s most likely to be a flushing toilet. “Dry” toilets “dry” toilets are the opposite of the flushing toilet because it’s non-water-based and has a unique toilet disposal and sanitation procedure.

There are a variety of flushing toilets that each have their unique strength and performance. They are all trademarks from various brands that people find appealing particularly if they’re silent and strong.


  • Affordable
  • Simple


  • Most fundamental

One Piece Toilet

It is among the toilet designs that the tank of the toilet is connected to the bowl, which results in the whole toilet being constructed out of ceramic.

The main advantages of these toilets are that the tank for water is usually smaller, which means there’s no crevice in the middle, which makes it easier to clean. A smaller understairs toilet is usually the best choice for homes with smaller spaces.

The one-piece toilet generally comes with a seat for the toilet and a toilet seat, so there’s no issue. The only drawback is likely the cost, but over the long run, it’s well worth it.

Another benefit of toilets that are one piece is that they are a shorter distance from the wall and you do not have to fret about the installation of the bowl, tank, and seat. The only way to install them is to correctly install the toilet, with the drain placed on the floor and the water supply to the wall.


  • Easy to wash
  • Installation is simple and easy to do


  • Expensive

Two-Piece Toilet

This is likely to be among the more well-known types of toilets throughout the world. As opposed to the traditional one-piece toilet in which the bowl and water tank are separated, which allows the tank to store more water.

While many people today prefer single-piece toilets over two pieces, they do have advantages. One example is the types of toilets that can last for decades are among the main elements.

Other toilet types can also be durable however this type of toilet has two pieces and is simple to repair and replace parts of. The only thing you need to be careful about is the manufacturer you select.


  • Durable
  • Repair/replacement of parts is simple.


  • You must be aware of the name of the brand

Small Compact Toilets

These toilets are designed for bathrooms that are small. Due to their compact size and compact designs they are perfect for bathrooms where you’re looking to conserve space or have difficulty installing a toilet.

These are typically wall-mounted toilets as well as toilets with no tank or just tiny. These toilets are perfect for homes with tiny spaces that require small toilets under stairs or RVs, motorhomes and boats. Now you have more room in your bathroom to put cabinets and plants as well as other nefarious items.


  • Ideal for a bathroom beneath the staircase
  • Affordable


  • Not the ideal place for a huge toilet

Corner Toilet

These toilets are often referred to as triangle toilets and the reason is simple: The water tank is designed in the shape of a triangle, allowing it to easily fit into the corner of a toilet.

The main benefit that corner toilets have is that they are able to fit in small spaces. But, they may seem strange to certain people and are not often purchased unless there’s an urgent need for space and/or design limitations.

The main point to remember is the fact that it can be difficult to find toilet designs with the correct configuration for the corner toilet, which does not hinder anyone’s access. You should consider a few things before making a final decision regarding this issue.


  • Perfectly fits into corners
  • Great if you require more space


  • It is difficult to locate
  • It can get in the way

Wall Mounted Toilet

If a wall-mounted toilet refers to, it typically implies that the bowl is fixed on the wall, and mounted so that it will not reach the floor. The most appealing feature of this type of toilet is the fact that they appear like they are water-less.

The tank is hidden inside the wall. The toilet is not equipped with a tank and a bowl hung against the wall. It makes cleaning easier for you, and takes away the necessity to be concerned about leaks from the tank.

Moving from standard toilets to different toilets, for instance wall-hung toilets can be an issue. It’s necessary to assist in installing the plumbing to ensure it’s sturdy and not movable.


  • Easy to wash
  • Creates more space


  • It is necessary to seek assistance from a plumber

Tankless Toilet

They are straight to the pipe. However, when water is pouring through the pipes, the toilets that are tankless are equipped with an electric pump which allows them to flush more effectively.

Tankless toilets usually come with a longer pipe than other kinds of toilets. This is because the bowl needs an increased amount of water to ensure a clean flush.

The benefit of these toilets is that they feature modern designs and are a lot smaller in dimensions. However, installing them can be a challenge at times, and in the event that the battery fails and the toilet stops functioning, it won’t flush.

There are mechanically-designed tankless toilets that don’t have an electric pump; however, they won’t be as clean as an efficient flush. They will also require a substantial amount of water to flush the waste through the pipe.


  • It has a modern style
  • Small size


  • The battery may be dead and the toilet won’t flush.

How Much Does It Cost to Remove an Understairs Toilet?

The removal of a Understairs toilet that is located under the stairs will cost you between £300 or £500 which includes the costs of draining and disposal. If you are planning to renovate the existing space in your home, ensure that the furniture and fixtures have been taken away.

The workers will remove the flooring tiles and plumbing, electricals and fittings for this. This can take several days, and the duration will vary depending on the dimensions of the space.

While DIY removal is feasible however, it is best to get the help of an experienced tradesman, particularly when it comes to electrical wiring and plumbing. This will protect you as well as your family members and your house from dangers.



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