Best One-Piece Toilets in 2021

Best One-Piece Toilets in 2021

One-piece toilets are mainly praised for their sleek and modern design that reduces the time spent on cleaning them. However, this isn’t the only feature they’re famous for.

If you’re on the market for the best one-piece toilet, you’re in the right place:

We selected the five absolute best units for any occasion and offered you some useful tips just below!

Quick Picks

Editor’s Choice

2nd Best Choice — Best Accessible One-Piece Toilet

3rd Best Choice — Best No-Clog One-Piece Toilet

Swiss Madison SM-1T254 St. TropezToto MS604114CEFG#01 UltraMax IIWOODBRIDGE T-0020
  • dual tornado flush (0.8/1.28 GPF);
  • skirted design for easy cleaning
  • ADA and WaterSense compliant;
  • made of heavy-duty materials
  • fully glazed trapway;
  • unique square design

One-Piece Toilet Pros and Cons

Before we begin, let’s answer the question:

Why do people seem to prefer one-piece units to two-piece toilets?

Well, that’s because this design comes with a lot of advantages!

See for yourself:

  • They’re easy to clean. The bowl and the tank of a one-piece toilet are connected into a single unit without any gaps or crevices that are hard to reach. Additionally, some of them can feature a skirted design with a concealed trapway. This makes cleaning and maintenance much easier.
  • They’re more water-efficient. You might’ve noticed that single-piece toilets have more compact dimensions than their two-piece counterparts, especially when it comes to the tank size. A lower tank profile means that it holds and uses less water per flush, which can help you reduce water consumption.
  • They’re compact. The same compact design makes one-piece toilets a better pick for smaller bathrooms. Some commodes even have a more compact elongated bowl that offers the same amount of comfort as the standard one without taking up too much space.
  • They’re less prone to leaks. The one-piece toilet has a concealed connection between the bowl and the tank, without any external holes. This contributes to a leak-proof design.
  • They need less time for mounting. All you need to do is to connect a one-piece toilet to the water supply line and the floor flange, and you’re all set.
  • They are more durable. Pretty often one-piece toilets feature an additional glaze covering layer to prevent any scratches or damage during transportation. This extra layer contributes to a longer lifespan of the bowl during exposure to water and waste.

However, one-piece toilets have some drawbacks too, and you need to consider them as well:

  • They’re heavy. Vitreous china is a pretty dense material, and an average weight of a one-piece toilet is 90-110 pounds. A skirted model may weigh even more — up to 140 lbs, so you will definitely require a second pair of hands to mount it.
  • They’re more expensive. A one-piece toilet requires more time and resources to be produced, and this reflects in the price, which is usually 50-100 dollars more than for a two-piece unit. Plus, if the tank or the bowl cracks, you will have to replace the whole unit, which is also more expensive (1).

5 Best One-Piece Toilets on the Market

Best Overall — Editor’s Choice

Swiss Madison SM-1T254 St. Tropez
  • water-efficient flush (0.8/1.28 GPF);
  • includes soft-close and quick-release seat;
  • the fully skirted design makes cleaning easier;
  • available in White and Black colors;
  • includes wax ring and bolt caps.
Swiss Madison SM-1T254 St. Tropez

Our selection of the best one-piece toilets begins with the St. Tropez unit by Swiss Madison. This commode features a contemporary minimalist look combined with great performance and includes everything for installation, so you can perform it by yourself.

The St. Tropez is a dual flush toilet. It uses 0.8 gallons for a light flush and 1.28 gallons for a full flush, thus meeting WaterSense requirements. The powerful Tornado technology scrubs the bowl clean with every flush, so it stays clean for longer. And when it’s time to finally clean, a fully skirted design of the commode will additionally save you time.

Since it’s a gravity flush toilet, you can expect quiet operation without any unnecessary noises. Plus, the St. Tropez features a soft close seat that further contributes to comfortable use.


  • Powerful flush that meets WaterSense standards
  • Easy to install because all the hardware is included
  • Cleaning takes minutes thanks to a skirted design


  • The bowl isn’t ADA compliant
  • The Black unit costs $130 more

Best Accessible One-Piece Toilet

Toto MS604114CEFG#01 UltraMax II
  • 1.28 GPF with patented TOTO’s Tornado system;
  • CEFIONTECT bowl glaze keeps it clean for longer;
  • ADA compliant bowl height, good for kids, seniors, and tall users;
  • includes soft close seat;
  • available in 5 colors.
Toto MS604114CEFG#01 UltraMax II

The Ultramax II by TOTO is our runner-up for this one-piece toilet review because of its comfort height. The 16.25’’ bowl meets the ADA standards when you put an included soft close seat on, which makes this commode perfect for senior users, kids, or just people who are taller than average.

Aside from that, the Ultramax II meets water conservation requirements by WaterSense. It features a 1.28-gallon flush that efficiently scrubs the bowl thanks to a patented Tornado flush technology. Plus, the bowl itself is covered in CEFIONTECT glaze that prevents the waste from adhering and stays clean for longer.

The unit includes all the necessities required for installation, such as the wax ring and bolt caps, so you can easily perform it by yourself at home. Plus, you can choose from 5 possible colors — Cotton White, Colonial White, Bone, Sedona Beige, and Ebony — to effortlessly match the toilet with your bathroom interior.


  • Universal height makes it a perfect pick for any family member
  • Water-efficient tornado flush can save you up to $100 on water bills
  • Compatible with TOTO’s smart bidet seats


  • The trapway is exposed, which makes the cleaning longer
  • The price depends on the color you choose

Best No-Clog One-Piece Toilet

  • fully glazed trapway with siphon action jet minimizes the chances of clogging;
  • water-efficient 1.0 GPF/1.6 GPF flush;
  • modern square design with skirted trapway for easy cleaning;
  • includes soft close toilet seat;
  • 15.75’’ standard height bowl.

Aside from making your bathroom interior instantly pop thanks to its sleek square design, the T-0020 by WOODBRIDGE is one of the best one-piece toilets because of its impeccable performance. The combo of powerful dual flush and fully glazed trapway just doesn’t leave any chance for clogs to happen.

The unit bowl has a standard 15.75-inch height, which makes it suitable for most adults. Plus, the square shape perfectly fits in smaller spaces without sacrificing comfort.

Maintaining the T-0020 is very easy. First, it has a skirted design and the glossy finish that prevents the waste from sticking to it helps you spend less time cleaning the unit. Second, it features a quiet soft close seat that eliminates any unwanted sounds when you use it.


  • Glazed trapway and powerful flush contribute to clog-free performance while saving water
  • Fits into smaller bathrooms
  • Skirted design for easy and quick cleaning


  • Won’t suit taller or senior users
  • Weighs 138 lbs and might be difficult to install single-handedly

Best Compact One-Piece Toilet

American Standard 2961A104SC.020 Colony
  • low-profile unit with a compact elongated bowl fits better in smaller spaces;
  • comfort height 16.5’’ bowl (without a seat);
  • highly efficient toilet with only 1.28 gallons per flush;
  • includes slow-close seat;
  • easy to clean and maintain.
American Standard 2961A104SC.020 Colony

The Colony fits right into this review of one-piece toilets because it’s a great pick for a limited space. The low-profile design of the unit perfectly combines with a WaterSense approved 1.28-gallon flush and sleek design without any hard-to-reach places.

Also, the commode has a 16.5-inch high bowl, which can meet the minimal ADA requirements if you put a seat on it. Thus, the toilet can suit all family members, including kids and senior users, and offer a comfortable experience for everyone. 

Another great feature of the Colony is its noise-free operation thanks to a gravity-fed flush and the included soft close seat. Finally, the one-piece design and stain-resistant bowl glaze make the cleaning easier and faster.


  • The perfect pick for smaller bathrooms
  • ADA and WaterSense compliant
  • Operates without any unnecessary noises


  • The hinges on the seat may loosen pretty quickly
  • The trip lever is a bit hard to press

Best Water-Saving One-Piece Toilet

DeerValley DV-1F52807
  • WaterSense certified 1.28-gallon flush;
  • compact design with a wider seat improves comfort;
  • fully glazed trapway;
  • seamless skirted design for easy cleaning;
  • includes all the bolts and nuts for installation.
DeerValley DV-1F52807

The DV-1F52807 by Deer Valley earned its place among the best one-piece toilets for the perfect balance between the compact size and features. It neatly fits into smaller bathrooms but the oblong bowl with a wider seat makes the use just as comfortable as a standard commode.

WaterSense certified single flush uses 1.28 gallons and backs it up with a siphon jet action to scrub the bowl clean. Plus, the tank construction removes any residue of water that can become a place for bacteria growth and ensures that you flush with fresh water every time.

The DV-1F52807 has a standard 15.25’’ bowl and suits most adults. Also, the seat that comes with the toilet features soft-close hinges that prevent annoying slamming and make the exploitation more pleasant.


  • Compact design that fits into smaller bathrooms just right
  • Wider seat than in other models for improved comfort
  • Easy to clean thanks to a concealed trapway


  • Uses ⅞’’ water supply fitting, and the instructions don’t specify that
  • Doesn’t meet ADA standards

One-Piece Toilet Buying Guide


Toilets are designed in various sizes, but the average dimensions of the commode are the following:

  • Depth: from 27’’ (compact toilet) to 30’’ (standard toilet);
  • Width: from around 15’’ (compact toilet) to 20’’ (standard toilet);
  • Back height: from 21’’ (low-profile toilet) to 31’’ (high-profile toilet).

Also, consider that the toilet requires at least 24’’ frontal clearance, which needs to be increased to 30’’ if you share a home with a senior person or someone who uses a wheelchair (2). 

Bowl Shape 

One-piece toilets can have a round or an oblong bowl. The latter is considered more comfortable because it has more sitting space. However, if you pick a toilet for a small bathroom, a round bowl, which is typically 2-3’’ shorter, might be a better choice.

Flush System

You can choose between the gravity-assisted or pressure-assisted flush, although the latter isn’t that common in the one-piece units.

A gravity-fed flush uses the gravity force to dispose of the waste. These toilets are quieter and suit for homes with medium to high pressure in the pipes; otherwise, they won’t flush the waste in a single round.

Pressure-assisted systems flush the waste with pressurized water, which allows them to use less water and ensures high performance in homes with low water pressure. However, if you go for this flushing system, be aware that it requires more maintenance and is costly to install and repair.

Water Consumption

The good news is that the majority of the modern commodes meet the EPA regulations for 1.28 or 1.6 gallons per flush.

But we recommend that you go for a dual-flush toilet, which allows you to reduce water consumption even further. These toilets feature a separate flush button for liquid and solid waste and can improve your household efficiency and save some money on water bills.


It depends on what you’re looking for. One-piece toilets are definitely sturdier and more durable, which means that they can last longer. Plus, they feature a leak-proof design and are easier to clean. But if you need a toilet that is easier to install single-handedly and easier to repair without ditching it, the two-piece unit might be a more suitable option.

ADA compliant toilets should have a bowl that is 17’’-19’’ high with a seat on. Certain one-piece toilets in this review can meet the minimum height requirements, and hence, you can use them for homes with the elder or handicapped people.

Yes. To ensure a precise fit, measure the rough-in area of your old toilet and check the main dimensions so that you can pick a one-piece unit that will fit right in.

If possible, always go for a dual flush commode because it is more efficient than a single-flush. Also, make sure that you pick the right unit size, so it won’t occupy too much floor space. Finally, match the toilet color with your bathroom interior for a more harmonious look.

No, in a lot of cases they’re pricier. A one-piece toilet requires more time to be produced, and its seamless leak-proof design also contributes to a higher price.

Owner - Mary O. Frazier


Mary O. Frazier

Mary O. Frazier — lead author of our website, connoisseur of interior design and plumbing. I will tell you the most interesting and important facts about household items. She reads a lot, plays chess and collects useful information for you. You can read more about her here.

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