Deborah is an incredibly talented journalist who's been working for numerous online magazines for over 8 years now. She's also our main research writer who can turn any boring topic into an easy-to-digest text. Loves biking and her two dogs.
Charles's been a plumber his entire life. Thanks to his vast experience we can always rely on Charles' expert opinion when creating any of our articles. He's also a fantastic fisherman and cook.
Last updated: July 20, 2021
Bathroomer is reader-supported. We may earn a commission through products purchased using links on this page. Learn more about our process here
What makes a perfect toilet to you? Is it a great design? Powerful flushing system or other smart features? Well, the modern and trendy one-piece toilets can give you everything you need in a toilet and more. These toilets are compact, easy to clean, water-efficient, have awesome designs, and offer a great bathroom experience. Just everything you need in your home toilet! That said, one-piece toilets come in all shapes, sizes and features, which means finding the perfect one for you may be a bit of a task.
We tried out many models in our quest to help you find the best one-piece toilet. Design and water consumption were some of the essential features that we first considered. Obviously, you need a compact yet good looking toilet that has water-saving capabilities such as a dual-flush system. Other important features that we also consider include material, weight, warranty, dimensions, ease of installation, certifications, and design. With all this info, you’ll be ready to make an informed decision.
Toto is one of the most reputable brands in the toilet industry, which means you can also rely on the TOTO UltraMax II to give you an excellent bathroom experience. But the brand name is not the only reason to buy this one-piece toilet as it offers a lot more features. If you want a good-looking but highly efficient one-piece toilet then this is all you need.
The first thing that you notice about this toilet model is its sleek design. All its pleasant features have been fitted into one compact toilet piece that minimizes spaces as well as accentuating your bathroom design. This is further enhanced by its CEFIONTECT™ glaze that gives it a more elegant and quality finish. The glaze also prevents any waste from sticking to the bowls, which is a pretty awesome feature.
We also loved that this one-piece toilet is ADA compliant. It can accommodate all users including the elderly and physically handicapped. ADA-compliant toilets give their target users great height comfort that is hard to get anywhere else. Moreover, it is CEC and CalGreen compliant so you can trust that you are getting a quality toilet.
You will also love its double cyclone flush technology. This technology uses powerful centrifugal action to leave your bowl and rim sparkling clean. The tank also refills in seconds for more convenience.
Would you fancy a luxurious one-piece toilet that not only looks great but also offers a load of functionality? You may have to fork out some extra dollars but the style and comfort of the Toto G400 makes it worth the buy. What’s more? It is ADA-compliant thus suitable for everyone.
This Toto toilet comes with a Tornado dual-flush system that includes a 0.9 gallon per flush option for the partial flush and a 1.28 gallon per flush for the full flush. With this feature, you can manage the amount of water that you use and make some savings on your water bills. The toilet also comes with PreMist technology, which relies on the toilet’s in-built bidet seat to give you a great bathroom experience.
It would be a disservice to Toto if we failed to mention the automated features in this toilet. The toilet’s lid will automatically open as you approach it and the PreMist technology gives your toilet clean and fresh sprays even before you relieve yourself. Its CEFIONTECT ceramic glaze reduces the number of times you have to clean it by preventing any waste from sticking on the bowl.
An interactive and easy to use remote is included to give you maximum control over the toilet. You can use the remote control to warm your toilet seat, start cleaning process, and use the bidet among other things.
KOHLER K-4007-47 San Souci is what you ought to get if you want a cute toilet to spruce up your small bathroom. The toilet has no SMART capabilities but its sleek design and stylish curves give it a modern look. It also works well with its powerful AquaPiston technology that pushes water to all corners of the bowl.
This one-piece toilet uses only 1.28 gallons per flush, which is way less than the 1.6 gallon per flush standard set for modern toilets and the 3.5 gallon per flush toilets antique toilets. This means that you will be saving much more at the end of the month when it comes to wayer bills. However, this does not mean that the flush isn’t powerful enough. Its AquaPiston technology is powerful enough and you won’t need a second flush.
Measuring 25.6 x 16.75 x 24.25 inches, this compact one-piece toilet features an elongated bowl with some cool curves on the edge and a chrome-plated flush lever. Its small build can really enhance the aesthetics of your tiny bathroom while still giving you some leg room for extra comfort. The great design of the KOHLER K-4007-47 San Souci is further complemented by a soft-closing seat that will close the lid without having to slam it.
Swiss Madisson SM-1T256 Carré is a square-shaped toilet that combines elegance and water-efficiency in one unit. Its unique shape will give you more room to sit on while improving giving your bathroom a modern look. Its dual-flush system makes it one of the most eco-friendly one-piece toilets that we reviewed.
As comfortable as it looks, this toilet is not ADA-compliant. It comes with a comfort height of 15 inches, which is the standard height for most toilets. The dual-flush toilet also has a 12-inch rough in measurement and a glazed skirted trapway for easy cleaning. The exterior is made of fully grazed ceramic that make it shine while a quick-release soft-closing seat gives you extra comfort. Just about everything you need in a toilet.
Unlike most one-piece toilets on the market, Swiss Madisson SM-1T256 Carré features a high-performing gravity-assisted flushing system. This flushing system is efficient and the tank refills itself in a few minutes in case you want a second flash. With the dual-flush option, you can use the light 0.8 gallons per flush for liquid waste and the heavy 1.28 gallons per flush for solid wastes.
This one-piece toilet is also easy to install and use. It is a great pick if you would love a one-piece toilet with an antique feel but a modern design.
American Standard Champion 4 is the perfect one-piece toilet for anyone who is simply looking for a great performing toilet. It doesn’t come with many smart or advanced features but it is fitted with quality technology to outperform its competitors’ performance. It also has a compact size that makes it perfect for even the tiniest of bathrooms.
One of the things that make this a great one-piece toilet is its powerful flushing mechanism. The American Standard Champion 4 comes with a 4-inch flush valve that can easily push water three times faster than a normal two-piece toilet. Its large trapway can move 70% larger solid wastes than the average toilet too. This ensures that you do not have to flush your toilet twice, which consumes more water. It also means that you do not have to worry about clogging your toilet.
The EverClean surface on this one-piece toilet guarantees that your toilet will always be clean. This is made possible by its non-sticky surface that does not allow waste to stick on the bowl and a microbial surface on both the inner and outer part of the bowl. These cleaning features makes cleaning both easy and fast.
What do we love it for?
Low water consumption
Easy to clean
You’ll never worry about clogs again
Features a powerful flushing mechanism
What were we disappointed with?
Comes with a poor quality plastic toilet seat
The bowl is a bit smaller for an elongated bowl design
WOODBRIDGE T-0019 is a modern toilet that will transform any bathroom. It is notable for its powerful yet silent flushing system that delivers great results each time. Ease of cleaning is also a major feature of this one-piece toilet as it has a skirted trapway that ensures there are no dirt in hard-to-reach places.
The fully glazed flush system in WOODBRIDGE T-0019 makes it an effective toilet if you wish to prevent clogs or leaks. It also comes with a dual-flush system that you can use to alternate between a light and heavy flash for liquid and solid wastes respectively. The half-flush option uses 1 gallon of water per flush while the full-flush option uses 1.6 gallons per flush. This translates about a 20% reduction in water consumption, which will save you a lot of money in water bills.
Although this WOODBRIDGE one-piece toilet is heavy, many users found that installation is pretty easy. This is especially true if two people work together during the installation process. Its skirted trapway makes cleaning an easy job as there are no grooves or crevices that can hide mold and other debris. The soft-closing seat is quite hygienic and improves your overall bathroom experience.
What are our favorite features?
It is certified by Watersense
Comes with everything you need for installation
Easy to cleaning
Powerful flushing mechanism
What could be better?
The silver coating on the flush button wears out quickly
Getting the perfect one-piece toilet should not be a challenging task especially if you know what you need to look out for. It is prudent that you understand the different features such as design, flush type, material, and ease of installation among others. Here are some important things that you should know before you pull out your credit card and order a new one-piece toilet.
How one-piece toilet will improve your bathroom
Are you wondering why there is a lot of fuss about one-piece toilets? After all, some look similar and may perform in the same way as some two-piece toilets. Here are some benefits that you can expect once you invest on a nice one-piece toilet.
Better design– Although style and design are a matter of personal preference, one-piece toilets have modern designs. They are a great option if you would love to accentuate the design of your bathroom with a sleek toilet.
Easy to clean– With a one-piece toilet, what you see is what you get. This simply means that there are no crevices, nooks, joints, or other hard to reach places where dirt gathers. Moreover, they are also easy to maintain since there are reduced chances of breakage or toilet leakages.
Compact– If you have a smaller bathroom then a one-piece toilet will come in handy. These toilets are often smaller than the two-piece models, which means they work well for bathroom with little spaces. Wall-hung toilets, especially, can save you a lot when it comes to space.
Easy to Install– With fewer parts to install, you are likely to take less time and effort installing your toilet. Having a one-piece design means you won’t have to attach the tank and the bowl, which is known to be problematic.
While one-piece toilets have several benefits that they offer to users, they also have their cons. For example, they are more expensive than their counterparts and some may not have a powerful flushing system. One-piece toilets are also generally noisier as they rarely use gravity-led flushing systems.
One- or two-piece toilet – which one to choose?
The main difference between the two is that one-piece toilets have an integrated bowl and tank unlike the two-piece toilet models. This means that they lack the connecting gap between the bowl and the tank that is often prone to dirt. One-piece toilets also have modern designs and come in a standard height that is comfortable for all users.
If there is a damaged or broken part then you have no option but to get a new unit unlike a two-piece toilet where you can replace the damaged part separately. However, the two toilets also share a couple of similarities too. For example, water consumption is not very different and they use similar flushing mechanisms.
One-piece toilet installation tips
Installing a one-piece toilet is almost similar to installing a two-piece toilet. However, the main difference is that the former comes as a single unit, which might make it laborious. The good thing is that you will be done quickly if you have some prior skills or experience. Here are some tips for a quick and effective installation.
The first thing is to place the closet bolts into their slots and secure them.
Flip the toilet upside down carefully and fit the wax ring over the middle of the base.
Gently fix the toilet base but ensure that the bolts align with the holes on your bathroom floor.
Once you are sure that the toilet base is level, you can now install the washers and fasten the bolts. Remember to cover the bolts of your toilet with trim caps for better stability and neatness.
At this point, you can install the flush mechanism and the toilet seat before you connect the water supply. Test the connections severally to determine if everything works well.
You may face some challenges during installation, especially when seeking to align the room holes with the toilet. Be patient but you may also want to get a professional to complete the installation if you are unable to complete it. This video provides great insight into the complete installation of a one-piece toilet:
As with any other bathroom or home equipment, you want something that offers the best features but stays within your budget. One-piece toilets are often more expensive than two-piece toilets, which means you will have to fork out a bit more. Of course, it goes without saying that the more you pay for a one-piece toilet, the more you get in terms of performance and even features. If you are willing to splurge on a toilet then Toto G400 can be a great choice. It offers a great bathroom experience and can be used by almost everyone since it is ADA-compliant.
That said, you can also get a good one-piece toilet for a bargain. Swiss Madisson SM-1T256 Carré, for example, offers a great performance and compact design but you will not break the bank with this toilet. And while price should be critical when looking for a one-piece toilet, it should not be your main concern. Ensure that you get a toilet that serves your needs and meets your preferences too.
Features to consider while buying the best one-piece toilet
With the many features that one-piece toilets come with, it may be difficult to make the right choice. Here are some features to consider when buying one.
Flush type and water consumption
The flush type that you choose is important because it determines the performance, noise level, and maintenance among others. Gravity-assisted systems use the weight of water to create the pressure that flushes all your waste away. They are generally quieter and need little to no maintenance. On the other hand, pressure-assisted flushing systems often come with a compressed air tank that offer a powerful flush. And while these types produce more noises, they offer the best performance. You can also opt for a dual-flush system like the one in Toto G400, which gives you a light and heavy flush option to help you conserve water. Dual flush systems offer the best water consumption capabilities than the other types of flushing systems.
One-piece toilets offer you a sleek and modern design that fits well into small and medium-sized bathrooms. Some are low-grounded for shorter people or children while others have a generous height provision for taller people or those who are physically handicapped. Although the standard height for toilets is 15 inches, ADA-compliant toilets such as TOTO UltraMax II offer a height of 17 to 19 inches for extra support to the knees and back. Moreover, they have an elongated design that is almost five times larger than rounded designs to give users more comfort.
Skirted or not?
Ideally, you want a one-piece toilet with skirted trapways and design like the WOODBRIDGE T-0019. Trapways are the bends on the back of most two-piece toilets that make cleaning a pain. A toilet with a skirted design conceals these trapways and instead offers a smooth surface. A toilet with a skirted design will enhance the aesthetics of your bathroom while also making it easier to clean the base of your toilet.
Installing a new toilet can be fun for some and a nightmare for others. Although you can easily install and fix your own toilet, the process can get challenging if you have no prior experience. That said, you want a one-piece toilet that you can easily install in a matter of minutes like the KOHLER K-4007-47 San Souci. It should also include an easy to read and understand manual that you can use when you get stuck.
Some toilet models require special attention and you may have to get the services of a professional. It is also not uncommon for a brand to require the installation of a professional lest the warranty becomes voided. This may be a more expensive expensive option but it will ensure everything is done right. Having a professional do the job also saves you from damaging or wrongly fixing certain parts leading to leakages that may impact the whole bathroom experience.
A guarantee gives the clients confidence that they are purchasing a toilet of the highest quality. Toilets are technical products that may get damaged during shipping or installation. You may also get a different model or design than the one that you ordered and this is where you need a product with a good guarantee period and terms.
Most of the one-piece toilets that we tried out in our review have a one-year limited warranty period. However, the American Standard Champion 4 and WOODBRIDGE T-0019 stand out with a 10-year and 5-year limited warranty period. With such a nice warranty period, you can rest assured that your toilet is of the highest quality.
It is prudent that you choose the right toilet size when you are shopping for a one-piece toilet. The last thing you want is a great looking modern toilet whose rough-in measurements cannot fit with what you have in your bathroom. This is why you need to take some measurements even before you go out to replace your current toilet.
Simply defined, the rough-in dimensions is the distance between the middle of your toilet flange to the wall. The standard rough-in measurement is 12 inches but there are 10 and 14-inch models in the market too. Knowing your rough-in requirements beforehand will give you a pleasant shopping experience.
There are several certifications that you can find on your one-piece toilet with each having its different meaning. ADA-compliant toilets such as Toto G400 and TOTO UltraMax II have a comfortable height of 17 to 19 inches, which may not mean much to you but makes great difference to the elderly and disabled. There are also other environmental certifications given to toilets that reduce water consumption and minimize your carbon footprint. The CalGreen compliance, for example, is offered to green toilets that reduce emission of harmful gases and use little water too.
The material that you choose for your one-piece toilet is important as it determines other important factors like the durability and appearance of your toilet. Most one-piece toilets are either made from porcelain, vitreous china, or ceramics, which are loved for their durability. The strong material coupled up with the skirted design that protects them from leaks make one-piece toilets very durable. Moreover, they look great and have glossy finishings that give them a classy look. The only downside is that most of them are costly and you may have to dig deeper into your pockets.
There are also plastic units, which are only popular because they are cheap and very lightweight.
Ease of cleaning
It is extremely important for you to know, beforehand, how often you will be cleaning your toilet and if cleaning will be difficult. Toilets can easily accumulate and build up germs if they are not properly and regularly cleaned. One-piece toilet units are easy to clean because you only have a single unit and the cleaning is straight forward. These toilets are built to ensure that they do not have any hard to reach places where mold can easily grow unnoticed. A one-piece toilet with a skirted design such as Swiss Madisson SM-1T256 Carré or WOODBRIDGE T-0019 is the best option if you are looking for an easy to clean toilet.
Yes, one-piece toilets clog less than the other type of toilets because they have better flushing mechanisms. While two-piece toilets use gravity-led flushing systems, most one-piece toilets have adopted pressure-assisted and tornado flushing systems. These systems offer good flushing power, which means less clogs.
Cleaning a one-piece toilet is an easy task. In fact, most of the modern toilets have some form of self-cleaning features that make this even easier. You can mix water and vinegar and use a wipe cloth to clean the outer parts of the toilet. A chemical detergent may prove effective when cleaning the inside part of the bowl. We recommend that you clean your toilet at least once a week.
You can use your rough-in measurements to determine if your new one-piece toilet will fit in your bathroom. To measure your rough-in dimensions just record the length of the wall to the middle of the waste pipe. A one-piece toilet has a standard 12-inch rough-in measurement.
Our top pick is Toto Ultra Max II as it is one of the few toilets that gives you a great bathroom experience. The one-piece toilet has a CEFIONTECT™ glaze that makes it elegant while ensuring no waste sticks on the bowl. Aside from having a powerful double cyclone flush technology, it is also ADA and CalGreen compliant.
Toto G400 is our premium pick, and for obvious reasons. It features a dual-flush system and PreMist technology that work with its in-built bidet to give you a pleasant bathroom experience. This one-piece toilet comes with some smart functionalities such as an automatic lid and seat warmer that are remote-controlled.
Swiss Madisson SM-1T256 Carré is a great pick if you want the best one-piece toilet without breaking the bank. It features a square-shaped bowl that offers you maximum comfort and leg room. It is a dual-flush toilet with a skirted trapway for easy cleaning and a sleek look. It is also ADA-compliant.