Tiny House

Tiny House Plumbing: How To Build Bathroom, Shower, And Toilet

By taufiqhaque

Do you know the challenging part of building a tiny house? It’s the bathroom shower and the toilet space you have to build in your home. All of these are integrated into the plumbing system of your tiny house. They’re the tiniest portion of a tiny house, so they take up the least amount of space. 

However, it is the most crucial component of any home, and it should be made as efficient as possible. If you hire an expert to help you build your tiny house, they will take care of the planning. Engaging an expert might cost a lot of money, which a person who wants to build a tiny house might not have. 

Even if one has money, it is necessary to know how and what to build to have a bathroom with a shower and toilet that fulfills needs. Nevertheless, if a person does not intend to hire a professional, then a thorough understanding of everything involved in a tiny house plumbing system needs to be known.

This article will stroll you through every detail you need to know about tiny house plumbing, no matter which one you design, whether it’s a bathroom, shower, or toilet.

Tiny House Plumbing: Bathroom or Toilet

The first thing one should know is whether there is a distinction between a bathroom and a toilet. Otherwise, it won’t be easy to decide which one to build. Commodes, urinals, and a washbasin are generally seen in a toilet. Other amenities, such as a shower or bathtub, may be unavailable.

On the other hand, the toilet and bath equipment, such as a shower/bathtub, is installed in the bathroom. Now, decide what you want to design for your tiny house based on your needs and read the rest of the article. However, an individual building bathroom for a tiny house can build the toilet and shower spaces separately or all incorporated in the same bathroom. It depends on the person’s needs and lifestyle choices.

Tiny House Plumbing: Tiny house bathroom

A bathroom is a mandatory part of any house, whether big or tiny. However, its design must be based on individual habits, lifestyles, and requirements. A bathroom handles a lot of work regularly in a person’s life. As a result, the design details should be made accordingly while building tiny houses bathrooms.

Start by listing

Keeping the bathroom design minimalistic is possible by writing down what the individual does daily, weekly, and monthly. No matter how small your bathroom is, try to incorporate storage. The amount of storage in your bathroom is determined by the number of sinks, showers, vanities, cabinets, toilets, mirrors, and towel racks.

Draw Layouts

Next, the plumbing system’s layout must be drawn. A glass corner shower, a washer/dryer combo, and counter space should all be included in the design. The floor plan must also be completed.

Maintain the dimensions

The average size of a tiny house bathroom is 25 to 50 square feet. Personal preferences may vary from person to person. If someone wants a bathtub, that measurement will almost certainly increase. 

Arrange Ventilation

Proper ventilation is essential in every bathroom, whether it’s in a tiny house or not. If the necessary ventilation is not arranged and examined properly, there is a potential that mold can develop, and the bathroom’s air quality will deteriorate. If a fan with a timer can be installed in the bathroom of a tiny house plumbing system, that will be perfect. 

Right Size of Sinks

For a bathroom in a tiny house, choosing the correct size sink based on the amount of daily work done on it is crucial. A modest sink is all that a small bathroom requires. After looking at various alternatives on the market, try to get the ideal fitted sink for your bathroom.

Right Size of Shower

Install a 32” by 32” shower in your bathroom for everyday usage. Showers will be available at any nearby retailer. So you can go to one and look at all of the many options before choosing one for your bathroom.

Proper Toilet

There are numerous toilet options to choose from that will be mentioned later. If you have the opportunity, try to use a composting toilet. Because it is simple to put up and uses generally available materials. However, the other options are also good. So an individual must go through their details before buying one.

Customize Vanity

You can always customize a vanity to your desire in the sink area and add some open shelves to store everyday items. As open shelves don’t feel confined, they aid with storage capacity.

Create Storage

In a tiny house, storage is difficult to have in a bathroom. However, in that small space, certain storage solutions should be arranged. Create a basic shelf for the cabinet to store various items above the door to free up space. In-wall storage nooks are another option. 

Aside from that, very low-profile storage can be constructed. Pull-out bathroom organizers are another wonderful storage option for your teeny-tiny bathroom. There is also some space under the sink that can be used as storage by adding elegant shelves or drawers. Using a back power outlet for charging electronic devices in the bathroom might also be a good method to save space.

Keeping Drawer organizer

Since most tiny houses do not have a separate vanity space, drawer organizers will come in handy because a lot of stuff, from jewelry to make-up, can be kept in the bathroom space. So, choose drawer organizers that will best fit your needs based on the number of items kept in your bathroom.

Utilizing Back doors

The benefits of the cabinet’s back doors should be utilized to maintain things clean. PVC holders should be added to the backs of cabinet doors so that items that can be hung can be kept in that place.

Buying Shower caddies

Separate shower caddies should be kept in your bathroom. It’s because there could be several persons living in that tiny house, each with their shower products. Keeping all of those goods in the bathroom’s small space can be tough and messy. As a result, this helps keep your bathing space organized and allows individuals to get items when needed.

Have Storage containers

Clear storage containers would be an excellent choice to organize the bathroom supplies. Keep all of the products in the category in clear storage containers so you can quickly see what’s in that small space when you need it.

Choose Corner hamper

Plan a corner hamper in your bathroom for dirty laundry. They can be purchased in any store or readily customized to meet your specific requirements.

Fill Empty voids

Make shelves or cupboards that are not deep to make use of every vacant space in your little bathroom. These shelves and cabinets will help you properly organize your bathroom items and save you time.

Tiny House Plumbing: Tiny house toilet

Tiny House Plumbing

The toilet is an essential part of the bathroom of any tiny house. There are a variety of options available in the toilet. Composting toilets, conventional toilets, regular flush toilets, RV flush toilets, incinerating toilets, and chemical toilets are all options in toilets.

Composting toilet 

Composting a toilet is a fantastic alternative for a tiny house because it doesn’t require plumbing and can flush sewage away. The wastes are composted on the site. A commercial composting toilet cuts down on the length of time it takes to dispose of waste. It is also environmentally friendly because it does not require any plumbing. 

However, they are pricey. There is also a different type of composting toilet. They’re known as bucket-style toilets, known for their endless storage capacity and ease of installation.

Standard flush toilet

A regular flush toilet can also be installed in a tiny home. However, a separate septic tank is required to hold the wastes, which is difficult to manage when the tiny house is moving.

RV flush toilet

RV flush toilets function similarly to normal flush toilets, but few differences. The usage of less water is one of the adjusted features. However, the tanks where the black water from this toilet will be stored occupy huge storage space. 

Incinerating toilet

One of the greatest solutions for your tiny house plumbing system is these toilets. Instead of flushing, the waste is burned using gas or electricity in incinerators. There is no need to worry about black water disposal because the garbage is burned.

Chemical toilet

Another option is chemical toilets, which require manual cleaning when they become full. However, the gross cleaning makes it less of an option for many.

Tiny house showers

tiny house plumbing

The shower space is another important part of the bathroom. Showers are the ideal alternatives to bathtubs since they save a lot of water and easily fit into a small bathroom. Building a shower in your tiny home, on the other hand, might be challenging because you’ll need to buy a shower insert or have a custom stall created, work out the tiny house plumbing system, and then draw out a design to guarantee all of the bathroom fixtures and accessories are properly fitted. It can be difficult to fit a shower into a tiny house bathroom, but it is always feasible with innovative thinking.

A complete shower in a box comes with a drain kit that can be a great solution for showers in tiny houses. Baths are also a fantastic alternative to consider because they don’t take up too much space. On the other hand, custom shower systems can always be created with waterproof materials. A personalized shower system will fulfill an individual’s specific needs even in that little space. The shower can also be DIYed. A good shower foundation is required in this instance. Shower bases like these can be found in stores. Mini tubs can also be added to the bathroom for people who want a little additional relaxation after a long day. However, a tankless water heater should be connected to the shower for hot water supply control.

How to build

With the toilet and shower that you build in your tiny house plumbing system, the bathroom has two basic processes.

Getting water into the house

The simplest way to get water into the bathroom, toilet, or shower is to bypass the plumbing system entirely. So, to bring water into the house, you must carry it to the necessary places. If this seems too much trouble, you might consider installing a tank and a pump to help circulate the water into the house. This is a fantastic alternative since it ensures that the water enters the house as smoothly as possible. A hose can also get water from hookups surrounding the tiny house.

Getting the water out of the house

A septic tank can be used to drain the water from your tiny house plumbing system. To eliminate the grey and black water of the house, there have to be separate lines. Greywater is usually easy to drain out of the house into surrounding places. However, a septic tank is required to drain the black waters from the local drainage connection.

Tips to follow

The bathroom incorporated with toilet and shower in your tiny house plumbing system here needs some tips to follow :

  • Drains should be carefully designed to avoid any mismanagement of water removal from the house.
  • Maintain a clean, hygienic, and problem-free bathroom environment by separating trash and dirty clothes in your bathroom.
  • Don’t forget to install an appropriate bathroom venting system.
  • Make storage space as much as possible to properly organize that small space. 
  • You can skip the bathroom sink to manage the work done there in other places. 
  • Build the wetland for draining the grey waters out of your tiny house plumbing system.
  • Make your tiny house plumbing system as basic and convenient as possible so that you can readily reach it when you need it.

 Consider your needs for a bathroom, toilet, or shower and plan accordingly.


Building the bathroom, shower, and toilet is the trickiest part to deal with when building a tiny house. And when one is DIYing the whole project, there are possibilities to face numerous difficulties in the process. However, the article helped the readers with almost all the details about building the tiny house’s bathroom, shower, and toilet. 

If you have gone through it all, you know about every detail, problem, and possible solution to your tiny house plumbing system. So, go and start that project of building the bathroom, shower, and toilet of your tiny house that you’ve been planning for a long time. 

You can also check: Tiny House Electrical and Plumbing Cost

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