How to Install a Wall Mounted Toilet: 5 Quick Steps

Written by

Paulk Webb


Freddie J. Hagopian

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how to install a wall mounted toilet

If you have a small bathroom, then you need to learn how to install a wall mounted toilet. You can save floor space, plus give a modern look to your bathroom. Since this new toilet design leaves some room underneath, it makes the toilet area easier to clean.

The prospect of wall mounted toilet installation might sound intimidating, but it’s not. All you need is a few tools and a comprehensive understanding of the product’s install diagram.

Let’s elaborate on the steps below.

Steps to Install a Wall Mounted Toilet

1. Prepare For The Installation Of Wall Hung Toilet


If you have an existing toilet in the bathroom, remove it to give room for the new one. Ensure you remove all the connection parts, including the water inlet hose, mounting bolts, gaskets, etc.

Once the bowl is out, cover the waste opening with a rag or any cloth to prevent any nasty odor from filling the room.

It would be easier to install a wall mounted toilet with tank from scratch. You have the freedom to choose where you want to put the new toilet in the bathroom layout, but it will be costly.

Just remember to keep the wall mounted toilet rough in for about 15 inches at all sides and close to waste pipes.

2. Assemble The Carrier Support Frame


Now that you’ve found the best spot for your new toilet, it’s time to install the frame that will hold the toilet on the wall and bear the weight of its users.

The steel carrier frame has all the necessary components of the toilet, including the water tank and flush mechanisms.

  • Assemble the horizontal and upright bars to make the foundation of the frame.
  • Fit the fixing mounts and the flush pipe to the cistern’s sides and underside, respectively.
  • Put the cistern into the frame by fitting the underside with the flush pipe first, then gently pressing down the cistern’s upper side. Secure it into place so that pressure is evenly distributed throughout it.
  • Insert the foot brackets into the frame.
  • Connect the clamp for the waste pipe to the frame and fit the waste pipe to finish the assembly.

Watch the basic assembly of the carrier frame in this video.

3. Install The Carrier Support Frame


Once the frame is all assembled, secure it in the wall. But first, you have to make measurements.

  • Draw lines where you want to position the frame on the wall. The frame should be at least 15 inches from the ground for extreme comfort.
  • Put the frame into the marked positions—note that the waste pipe must be in the exact middle of the frame.
  • Mark and drill the holes for the brackets. Do the same for the waste pipe if you’re installing a toilet from scratch.
  • Secure the frame to the wall with bolts.
  • Make sure that everything’s level with a spirit level. Place the device in the middle of a horizontal bar; the air bubble should be between the guidelines marked on the spirit tube.

4. Plumbing For Wall Mounted Toilet


Plumbing is usually the trickiest part of this installation because you have to make the right connections to the sewage system and water lines. If you’re in doubt, check the product’s plumbing diagram.

  • Run the cold water supply line to the shut-off valve,
  • Connect the water inlet hose from the shut-off valve to the cistern’s connection point or flush system. Avoid over-tightening the inlet to prevent damaging the screws, which can lead to future leaking problems.
  • With a bucket ready, open the valve to check the water connection. If you see any leaks, tighten the valve a little.
  • With the water inlet hose ready, connect it to the flush system.
  • Connect the waste pipe to the waste line. It should lead to the black tank where all wastes are stored. Make sure that the black tank is vented outside if your toilet has no trap to keep the odor from escaping.

5. Install The Toilet Bowl


Now that the frame is all set up, you can connect the toilet bowl to finish the installation. Handle the bowl with care because they can crack with rough handling.

  • Insert the flush pipe and waste pipe into the wall fully. Mark the final location of every pipe.
  • Insert the pipes into the back of the toilet bowl and mark where they go past the back edge.
  • Find the mark nearest to the end of each pipe and add 5 mm. Mark that spot and cut off the excess part.
  • Smoothen the edges with a file and apply a seal lubricant.
  • Push the pipes into the wall and insert the bowl. Consider putting a gasket on the bowl’s outlet to create a watertight seal.



Are wall mounted toilets difficult to install?

Installing wall mounted toilet is a bit difficult. You’ll need to set up a frame to hold the toilet on the wall and work on the plumbing. If you want guidance, you can check the manufacturer’s installation instructions or manual.

Let’s say you own the T3686 Blend Cube Wall Hung Toilet. Refer to Ideal Standard wall hung toilet fitting instructions.

How much space do you need behind a wall mounted toilet?

You’ll need a chase with 10.5 inches to install the carrier frame of a wall hung toilet. A back-to-wall toilet needs more floor area of the chase, about 14.5 inches, because the cistern is bigger. Once the frame is installed, the cistern is hidden from view, so it looks like the toilet has no space at the back.

How much does it cost to install a wall mounted toilet?

A commercial wall mounted toilet can cost between $300 to $2,000 or even more, while the labor cost can cost as much as $900, including the materials to modify or build the drywall. In total, you’ll need several thousand just to install a wall mounted toilet.

If you like to save on the cost, make sure that you know the basic plumbing connections.

How does a wall mounted toilet work?

A wall mounted toilet has a steel frame that holds the toilet above the floor. You can’t see a large cistern behind it because it’s fitted inside the frame and sometimes hidden from view.

Just like a regular toilet, a wall mounted model connects to a shut-off valve to regulate the flow of water. A water inlet hose connects from the valve to the flushing system. Each time you do your business, all the wastes go down the waste pipe and into the waste line.

What are some good brands of wall mounted toilets?

If you want a complete installation kit, Toto is the best brand because it includes a carrier frame to the package. American Standard and Kohler are two brands known for their durability.


Now that you know how to install a wall mounted toilet, you can make an upgrade to your bathroom anytime. All you need is adequate knowledge about plumbing and fitting a carrier frame onto the wall. If you want the installation to be perfect, you can ask a professional to do the job for you.

  • Difficulty: Intermediate
  • Time: 3 Days
  • Day 1: Preparation of Bathroom And Walls
  • Day 2: Installation of Carrier Support Fixture
  • Day 3: Installation Of Bowl And Other Finishing Touches
  • Cost: $700-$3,000

Read more: Wall hung vs floor mounted toilets: what should I choose?

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