How To Replace A Toilet Bowl?

If you are wondering how to replace a toilet bowl? You will find the answer in this article. The replacement process is not as easy as it might seem. But we will make sure to guide you throughout the whole process.

With technological advancements, new and water-efficient toilets are also available in the market. You may want to replace the older version with a new, water-efficient toilet bowl. In the second case, you may need to change the toilet bowl because of cracks and breakages. However, you have to learn the process of replacement first.

Toilet Bowl Replacement Process

Replacing a toilet bowl is simple yet tricky. You have to follow the process in complete order to avoid any confusion.

For Plumbing Services

Measure the Toilet Size

Before replacing the older one, you need to take some measurements. First, measure the distance from the back wall to the closest bolt that holds the toilet on the floor. Secondly, you must measure from the back wall to a nearby supply line. 

It is also a good idea to take the measurements from the side wall. This measurement will clarify doubts about the toilet fitting in your space. The shape of the toilet is also essential and should be chosen wisely.

Turn off the Water Supply

Whatever plumbing work you do, turn the water supply off. If you do not do that, we will be distracted by the water in the pipes. Moreover, the water bill will also increase.

First, find the isolating valve for only that portion where you have to work. If you do not find one, shut the supply of the complete home to get rid of further disturbance while the plumbing work.

Drain the Toilet Completely

Drain the toilet to empty the tank and flush off all the left water. Furthermore, clear the remaining water from the tank with the help of a sponge. Squeeze the water out of the tank until it is dry.

Remove the Nuts and Bolts

When you have to replace a toilet bowl, the first step is to remove the old bowl. The bowl is mounted on the floor with the help of nuts and bolts. It would help if you unscrewed these nuts and bolts with an adjustable wrench.

In most cases, the nuts and bolts will open easily and will not need any further effort. But sometimes, when the nuts and bolts get too rusty, you may need a hacksaw to cut them.

Changing/Removing  a Toilet Bowl (older one)

It’s time to remove the old bowl. You should call a helper to assist you in doing that. Once the nuts and bolts are opened, it is just a matter of lifting the bowl from the floor and placing it somewhere else.

Get Rid of the Old Wax Ring

If you replace a toilet bowl, you should eliminate the wax ring to avoid your house getting waxed. It is better to remove the ring with the help of a putty knife. In this way, the inspection of flanges is also possible. If the flange is not in good condition, you should replace it.

Test the New Toilet Bowl

Now you have to replace the toilet bowl. You should first have a test drive by just putting the bowl in place. You should check the alignment with the bolts and the position of the toilet bowl.

You have almost finished the job if everything is right and the holes are aligned with the bolts’ slots. If there is a need for adjustment, do it. If you are all clear up to this point, the following steps will be like plug and play.

Replace a Toilet Bowl

Tighten the Nuts and Bolts

Apply the wax ring to the horn and press it firmly. Use the ring carefully because once it touches the floor, it is no more usable. Place the toilet bowl perfectly so that the slots are synchronized.

Insert the bolts into the allocated spaces. Tighten the nuts and bolts using an adjustable wrench. Apply the required amount of torque and do not overtighten the nuts.

Finishing Touch

You’ll need to put the flush valve gasket with the tank on the bottom, around the center opening, and secure the mounting bolts through the inside tank. Then, adjust the tank on the bowl, slip the mounting bolts through the holes in the bowl, and add and tighten the nuts and washers until the tank is well and truly fixed.

Open the Water Supply

Now open the water supply and check for leakages in the connections.


It is tricky to replace a toilet bowl and install a new one. The process is time taking and needs full attention. You should grip all the steps before you jump into the practical. The complete installation guide is explicitly illustrated in this article.

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