According to Rescue Rooter, Tiny House bathroom plumbing is so crucial. After all, you cannot live in a house without being able to use the bathroom. The plumbing part is a major concern to those who want to own a Tiny Home.

You may have questions like, how do I get water to use in my tiny home? Or if I want to defecate, where will the waste go? or will it be possible to have a shower in my tiny house? Read through this article and you will definitely get your answers

Tiny House bathroom plumbing

Tiny House Bathroom Plumbing

When it comes to having water in your house, there are certain decisions to be taken. You have to decide on which option is favorable to you. Tiny house plumbing for a bathroom only takes a day or three to finish.

For tiny house plumbing to work, you have to connect your tiny house to a water source. Then try distributing the water via cold and hotlines to where water is intended to be used.

Basics Of Tiny House Plumbing

There are two stages of plumbing your tiny home:

  • Rough plumbing
  • Finish Plumbing

1. Rough plumbing

This consists of fixing the water inlet, routing water pipes through wall cavities, and connecting the drain pipes. It is in this stage, that pipes are installed and connected to end destinations such as the bathroom sink, kitchen sink, shower, and other water appliances.

2. Finish plumbing

This is the second stage of your Tiny House bathroom plumbing. In this stage, supply and drain lines are connected to the plumbing fixtures. It is done after the rough plumbing and interior work is completed, e.g drywall.

After this stage is completed, the tiny house is connected to the water source via a water hose, and then, checks are done to ensure there are no leaks.

Types of Tiny House bathroom plumbing

1. On-Grid Plumbing

This is a popular type of tiny house plumbing that requires using a water hose to get water. You connect a water hose to a permanent water source such as an outdoor faucet or an RV spigot. It is cost-effective.

2. Off-Grid Plumbing

With this option, you have to store water in a water tank. It cost more than on-grid plumbing and you have to create space for a water tank inside your house. This option has its pros and cons.

To have water in your tank, you may decide to use a pump to circulate and pressurize the water, carry water in jugs and pour them into the tank, or use a hose through an external fill port.

You have to decide on the size of the tank to get, remember it’s a tiny house with less space. Considering the space, you may go for a smaller tank and it might not be enough to flush a toilet. And the pumps are noisy.

This option makes it possible for you to have a shower. And there are tons of creative ways to hide the water tank like under your sink or kitchen cabinets.

3. Hybrid

This is the use of both the on-grid and off-grid plumbing options. You can use a water hose to connect water to a regular water supply and at the same time have a tank and a pump. This will help in case of any situation and it gives lots of freedom and flexibility.

You don’t have to be worried about having water in your home. Although it may involve more work, the tank may take up some space and the pumps might be noisy but this is an ideal option.

Plumbing Tiny House Drainage

30+ Stunning Layout Ideas For Your Tiny House Bathroom

If we’re going to talk about the bathroom plumbing of a Tiny Home, we can’t do so effectively without also covering the aspect of drainage. This part is not so easy, you have to be careful about where the water and waste go.

You should also note that you could install a regular flush toilet, an incinerating toilet, or the popular composting toilet. Liquids can be diverted into the greywater tank, while solids are stored for an extended period but must be emptied once per month.

The waste, if strictly composted, can also provide sufficient nutrients for vegetation but not all areas allow that kind of waste disposal. The incinerating toilet burns up the toilet waste until there’s nothing left but a bit of dust to sweep up. Gas or electricity can be used here.

#1. The Grid

This is the easiest solution when it comes to removing waste water from your tiny house bathroom or kitchen. You just have to hook your house up to an existing system. This means a septic system or the public sewer system in more urban areas. It involves fixing a drainage system and connecting it up to an external system.

#2. Grey Water Catchment

Grey water is any wastewater that hasn’t come into contact with feces. Black water is the waste from your tiny house toilet. The good thing about grey water is that it is easy to drain out of your tiny house. It’s possible to drain this water into the ground and even some to plants.

#3. Collect and Dump

This option involves the collecting of wastewater – both grey and black – and getting rid of it at dump stations. You could use a black water holding tank outside of your tiny house and a simple bucket under the sink or shower for grey water. This is not so a nice or convenient option for a tiny house bathroom. You will have to be going to the dump station every time to dump your waste. It’s kind of irritating too.

How much does it cost to add plumbing to a Tiny House?

Now we’ve circled right up to Tiny House plumbing cost. How much does it cost, you may wonder? Before you ask your Plumber for a quote, it’s important you get an idea of the amount you would need to spend to undertake this project.

The estimated cost for plumbing a Tiny Home bathroom and toilet would cost in the region of $3,000 to $7,000 dollars…and that’s excluding the workmanship.

How do you plumb a toilet in a Tiny House?

I think the question to ask yourself before asking this is: am I plumbing the bathroom by myself or am I getting a professional to do the work for me?

If your answer to the above is the latter, then you really don’t need a dedicated DIY guide to show you how to plumb a toilet in a Tiny Home. You need to let a professional Plumber like South Adelaide Plumbing and Gas for example, step in and do a marvelous job.


Through this article, I hope you have gotten an idea of how tiny house bathroom plumbing is done. If this article was helpful to you, please, help a fellow Tiny Homeowner by sharing it on Social Media. Thank you!

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