7 Steps for a 1-Piece Toilet Bowl DIY Installation

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If you’re considering upgrading your bathroom or replacing an old toilet, installing a 1-piece toilet bowl can be an excellent choice. Its sleek and modern fixtures are not only aesthetically pleasing but also easy to clean. By following the following step-by-step instructions, you can successfully install a 1-piece toilet bowl by yourself.


Shut Off the Water Supply

One key thing to note before a toilet bowl replacement or installation is to shut off the water supply. Locate the shut-off valve, typically positioned behind the toilet near the floor, and turn it clockwise until fully closed. This action ensures that no water flows into the toilet during the toilet bowl installation process.


Remove the Old Toilet


To install a new 1-piece toilet bowl, you must remove the old toilet bowl first. Use an adjustable wrench to loosen the nut, and once loose, unscrew it by hand. Next, remove the caps covering the bolts at the base of the toilet, and using a wrench, unscrew the nuts. Lift the old toilet bowl off the floor carefully, being prepared for any water spillage by having towels or a bucket nearby.


Create a Seal


To prevent your new toilet bowl from leaking and other common toilet bowl problems, ensure a watertight seal between the toilet and the floor. When installing a wax ring, place it on the flange, which is the opening on the floor where the toilet sits. Press the wax ring gently onto the flange, ensuring it is centred and secure. This wax ring acts as a seal, preventing any leaks from occurring.


Place the New 1-Piece Toilet Bowl

With the wax ring in place, lower the new 1-piece toilet bowl onto the flange. Align the bolt holes on the base of the toilet with the bolts on the flange, and once aligned, press down firmly to create a good seal with the wax ring. 


Connect the Water Supply Line


Reconnect the water supply line by taking the flexible water supply line and screwing it onto the threaded outlet at the bottom of the toilet tank. Use an adjustable wrench to tighten the connection being careful not to overtighten and risk damaging the threads. Once the connection is secure, turn on the water supply valve to allow water to flow into the toilet tank. Make sure the flow of the water is consistent. Otherwise, you might have signs that the toilet bowl installation was improperly done.


Secure The 1-Piece Toilet Bowl to the Floor

To ensure the stability of the toilet bowl, secure it to the floor. Place the plastic caps over the bolts at the toilet’s base and hand tighten the nuts onto the bolts. Use a wrench to tighten them further, but again, exercise caution not to overtighten and crack the porcelain. Once the toilet is securely fastened to the floor, use a level to ensure it is perfectly straight. If unsure, this may be a good enough reason to hire a professional to install your toilet bowl for you instead.


Install the Toilet Seat and Lid

The final step is to install the toilet seat and lid. Most 1-piece toilet bowls from reputable brands come with a seat and lid included. Align the seat with the holes in the toilet bowl and slide the bolts through. Secure the bolts with the provided nuts, making sure they are tight enough to prevent any movement but not so tight that they crack the seat. Close the lid and give it a test to ensure smooth opening and closing.


Contact Toilet Bowl City for Professional Toilet Bowl Installation Services

If you are not confident in your DIY skills or simply prefer to have a professional handle the installation, consider reaching out to Toilet Bowl City for expert toilet bowl installation services. Our team of skilled technicians can ensure a seamless installation and provide any additional guidance or advice you may need.



To install a 1-piece toilet bowl, start by shutting off the water supply to prevent water flow during the process. Afterwards, remove the old toilet, ensuring you are prepared for water spillage. To prevent different types of toilet bowl leaks, securely install a wax ring onto the flange. Place the new 1-piece toilet bowl onto the flange, reconnect the water supply line, and securely fasten the toilet bowl to the floor. Lastly, install the toilet seat and lid for complete functionality. 

By following these steps diligently and thoroughly, you can ensure the proper installation of your toilet bowl. However, more often than not, problems can occur with DIY toilet bowl installations. Thus, if you require professional assistance, don’t hesitate to contact a reliable toilet bowl service provider like Toilet Bowl City Singapore. Our technicians will ensure a hassle-free process and permanent solutions if you encounter any problems with your toilet. 


At Toilet Bowl City Singapore, we understand the need to keep home service expenses within your budget. Hence, we offer honest and reasonable pricing for any of your toilet bowl installations works. Select from our range of toilet bowl brands, browse our past toilet bowl installation projects for inspiration, or read up on toilet bowl-related articles to find out more about toilet bowl installation services. Get in touch with us now via WhatsApp at +65 8241 0032!