A modern one-piece toilet can give your bathroom a cleaner look, simplify cleaning around the base, and add useful comfort features. The right choice still depends on practical details: rough-in size, bowl shape, seat height, flush volume, and whether the toilet will fit around your shutoff valve. These five options offer different combinations of water savings, accessibility, and streamlined design.
Table of Contents
Quick Comparison
| Toilet | Flush | Seat and bowl | Standout feature |
|---|---|---|---|
| Swiss Madison St. Tropez | Dual flush: 1.1/1.6 GPF | Elongated; comfort height | Dual Vortex flush and black hardware |
| BAYROLL Sleek Modern Toilet | Dual flush: 0.9/1.28 GPF | 17-inch chair-height seat; elongated | Short 25.5-inch depth and MAP 1000g claim |
| CASTA DIVA One Piece Toilet | 1.0 GPF | 17.2-inch seat; elongated | Air-pressure-assisted flush with hands-free options |
| DeerValley DV-1F0437 | Dual flush; listed figures vary | 17.5-inch seat; elongated | Rimless bowl and quick-release seat |
| CANEST T01 | Dual flush: 0.9/1.28 GPF | ADA-height; elongated | Skirted exterior and quick-release seat |
Our Picks: Best Modern One Piece Toilet reviews
1. Swiss Madison St. Tropez: A Sleek Pick with Dual Vortex Flush
The St. Tropez pairs a one-piece body and elongated bowl with a dual-flush button. You can choose a 1.1 GPF flush for lighter use or a 1.6 GPF flush for a full flush. Its black hardware adds a distinct contrast to the otherwise modern profile.
The listing specifies a standard 12-inch rough-in and describes the seat as comfort height, in a 17-to-19-inch range. That broad range makes it especially important to confirm the actual seat height before buying if accessibility or a particular fit is a priority. The ceramic is described as non-porous and scratch-resistant, which may help it hold up to routine bathroom use.
Compared with the more water-efficient options here, the St. Tropez uses more water on its full flush. Its practical appeal is the combination of a familiar 12-inch fit, elongated bowl, and choice of flush volume. The product is listed as unavailable in the supplied product information, so check its current listing before planning a purchase.
Pros:
- Dual-flush options of 1.1 and 1.6 GPF
- Elongated bowl for added room
- Standard 12-inch rough-in
- Modern look with black hardware
Cons:
- Its full flush uses more water than the lower-GPF choices in this group
- Confirm the precise seat height and availability before buying
Verdict: Choose the St. Tropez if you want an elongated, modern toilet with dual flushing and black hardware, and you are comfortable verifying its current availability and seat dimensions.
2. BAYROLL Sleek Modern Toilet: Compact Depth and Chair-Height Seating
The BAYROLL is a fully skirted one-piece toilet with a listed depth of 25.5 inches, making it the shortest option in this comparison by the stated dimensions. That can be useful in a smaller bathroom, though you should still check the full measurements against your available space and the location of nearby fixtures.
It has a 17-inch chair-height seat, an elongated bowl, and dual-flush settings of 0.9 and 1.28 GPF. The listing also claims a MAP score of 1000g. A soft-close, quick-release seat is included, and the skirted sides are designed to make the exterior easier to wipe down.
Installation details deserve attention: the toilet is designed for a 12-inch rough-in, and the listing gives a clearance condition for the angle valve. It says the horizontal distance between the angle valve and waste-pipe center should be greater than 8 inches, or the valve should protrude less than 3 inches. Check that diagram and your plumbing before ordering. The package includes several installation parts, but not the floor flange or water supply pipe.
Pros:
- Compact listed depth of 25.5 inches
- Dual-flush settings of 0.9 and 1.28 GPF
- 17-inch chair-height seat and elongated bowl
- Soft-close, quick-release seat and skirted sides
Cons:
- Angle-valve clearance needs to be checked before purchase
- Floor flange and water supply pipe are not included
Verdict: The BAYROLL is a strong fit for a tight bathroom if its plumbing-clearance requirements work with your layout.
3. CASTA DIVA One Piece Toilet: Low-Flow Flush with Hands-Free Options
This CASTA DIVA model takes a different approach to flushing. Its built-in tank and air-pressure-assisted system are designed to produce a strong flush while using 1.0 GPF. The listing also describes a siphon-jet system and a MAP score of 1000g, and says the toilet works without electricity.
For operation, you can flush with a foot-kick or side button. That gives you options for hands-free use, though shoppers should confirm the placement and operation of the controls suit their bathroom and household. The elongated bowl has a listed seat height of 17.2 inches and a soft-close lid. A skirted base and stain-resistant vitreous china complete its streamlined design.
The toilet uses a standard 12-inch rough-in, and the listing says the kit includes the seat, flush system, wax ring, and mounting hardware. Its 1.0 GPF claim is presented as meeting WaterSense criteria, but shoppers who need verified program certification should confirm the model’s current certification details before buying. This is the most distinctive flush system in the group, but its extra mechanisms may be more complex than a conventional dual-flush setup.
Pros:
- Uses 1.0 GPF according to the product listing
- Air-pressure-assisted flush with a stated MAP score of 1000g
- Foot-kick and side-button flush options
- 17.2-inch seat, elongated bowl, and skirted base
Cons:
- The flush system is more specialized than a standard dual-flush design
- Confirm WaterSense certification if official certification matters to you
Verdict: Pick the CASTA DIVA if low water use and hands-free flush options matter more to you than a simple, conventional flush mechanism.
4. DeerValley DV-1F0437: Rimless Bowl and Tall Seat
The DeerValley DV-1F0437 combines a one-piece body with a rimless bowl, a compact elongated shape, and a listed 17.5-inch seat height. Its dimensions are 26.77 inches deep, 14.5 inches wide, and 26.6 inches tall. Measure your bathroom carefully, especially if you are replacing a toilet in a narrow space.
The product information describes a dual-flush system, dual nozzles, and a MAP score of 1000g. However, the listed flush volumes do not agree: the title states 1.1/1.28 GPF, while the description gives different figures. Because that difference affects water use, confirm the correct flush settings with the seller or current product details before choosing this model.
A soft-close, quick-release seat is designed to close quietly and come off for cleaning. The glossy ceramic surface and one-piece construction also support a simple, streamlined look. The product listing specifies a 12-inch rough-in and describes the seat as ADA-compliant. Its availability is marked as unavailable in the supplied product information, so check whether it can currently be ordered.
Pros:
- 17.5-inch listed seat height
- Rimless bowl and quick-release seat
- Compact elongated design with a 12-inch rough-in
- Dual-flush design with a stated MAP score of 1000g
Cons:
- Product information gives conflicting flush-volume figures
- Availability should be confirmed before planning a purchase
Verdict: Consider the DeerValley for its tall seat and rimless design, but verify the flush specifications and availability first.
5. CANEST T01: Straightforward Dual Flush in a Skirted Design
The CANEST T01 is a one-piece toilet with an elongated bowl, a skirted exterior, and dual-flush controls. Its settings are listed as 0.9 GPF for lighter use and 1.28 GPF for a stronger flush. That gives you a lower-volume option while keeping a higher-volume setting available when needed.
The product is described as having an ADA-height seat, but the supplied information does not give an exact seat-height measurement. If you need a precise height for comfort or access, confirm it before ordering. The smooth glazed ceramic and skirted sides are designed to make routine cleaning easier, and the seat has both soft-close and quick-release features.
The standard 12-inch rough-in is intended to fit many common bathroom layouts, but you should still measure from the finished wall to the center of the floor outlet. Compared with the BAYROLL, the CANEST does not list a compact depth measurement or a MAP score, so it is harder to compare on those points. Its appeal is a clear dual-flush setup and a neat exterior without the specialized system of the CASTA DIVA.
Pros:
- Dual-flush settings of 0.9 and 1.28 GPF
- Elongated bowl and skirted exterior
- Soft-close, quick-release seat
- Standard 12-inch rough-in
Cons:
- The supplied information does not state an exact seat height
- No depth measurement is provided for checking tight spaces
Verdict: The CANEST T01 is a practical choice if you want a skirted one-piece toilet with low-volume dual flushing and a removable seat for cleaning.
How to Choose a Modern One-Piece Toilet
Measure the Rough-In and Available Space
The rough-in is the distance from the finished wall behind the toilet to the center of the floor drain. All five toilets in this comparison specify a 12-inch rough-in, but measure your own bathroom before ordering. Also check the toilet’s depth, width, and height against nearby walls, doors, vanities, and other fixtures. A compact model can help in a small room, but the full footprint still needs to work with your layout.
Check the Flush Type and Water Use
Dual-flush models let you choose between two flush volumes, while the CASTA DIVA uses a single 1.0 GPF system with air-pressure assistance. Lower GPF figures can mean less water per flush, but the flush method and the manufacturer’s performance information matter too. Compare the exact settings, and verify any conflicting product details before buying. Do not assume that two toilets with similar water use will flush in the same way.
Choose a Seat Height and Bowl Shape That Suit You
An elongated bowl offers more room than a round bowl, but it may take up more floor space. Seat height is another important comfort factor. A taller seat can make sitting down and standing up easier for some people, while a lower seat may suit others better. Look for the exact seat-height measurement, not only a general label such as “comfort height” or “ADA-height,” especially if you are matching an existing bathroom setup.
Think About Cleaning and Seat Features
A one-piece design has fewer seams between the tank and bowl than a two-piece toilet. Skirted sides can also make the exterior easier to wipe, though some designs may require careful access during installation. A quick-release seat is useful when you want to remove it for a deeper clean, and a soft-close feature helps prevent the seat from slamming. Check which features are included with the exact model you are considering.
Confirm Plumbing Clearances and Installation Parts
Even a standard rough-in does not guarantee that every toilet will fit your plumbing. Check the shutoff valve location, supply connection, floor flange, and any clearance instructions in the product listing. Included installation parts vary: the BAYROLL, for example, is described as including a wax ring and mounting hardware but not the floor flange or water supply pipe. If you are not experienced with toilet installation, plan for help from a qualified plumber.
Verify Claims and Current Product Details
Specifications can change or be presented differently across a product title and description. The DeerValley listing, for example, gives conflicting dual-flush figures, so confirm the correct settings before purchase. If a stated certification is important to you, verify it with the relevant program or current product documentation. It is also sensible to confirm that the model is available and that the included parts meet your needs.
Frequently Asked Questions
What is a one-piece toilet?
A one-piece toilet has the tank and bowl formed as a single unit rather than as separate pieces joined during installation. This gives it a continuous look and fewer seams between the tank and bowl.
Do all five toilets fit a 12-inch rough-in?
Each product’s supplied information specifies a 12-inch rough-in. Still, measure your own rough-in and check the toilet’s installation requirements, because other plumbing clearances can affect fit.
Which option is designed for a small bathroom?
The BAYROLL lists a depth of 25.5 inches and is described as a space-saving model. Confirm its full dimensions and the angle-valve clearance requirements before ordering.
Which models have dual-flush controls?
The Swiss Madison, BAYROLL, DeerValley, and CANEST models are described as dual-flush toilets. The DeerValley product information gives conflicting flush-volume figures, so verify its settings before making a decision.
Does a taller toilet work for everyone?
No. A taller seat can make sitting and standing easier for some people, but comfort depends on your height, mobility, and preference. Check the exact seat height and consider who will use the toilet most often.
Are installation parts included?
Included parts vary by model. The CASTA DIVA listing says it includes a wax ring and mounting hardware, while the BAYROLL listing says it does not include the floor flange or water supply pipe. Review the parts list for your chosen toilet and arrange installation help if needed.
Which model is the best overall choice?
The best fit depends on your priorities. The BAYROLL stands out for its listed compact depth and dual flush, the CASTA DIVA for its low-flow air-pressure-assisted system, and the CANEST for a more conventional dual-flush setup with a skirted exterior. Measure your space and verify the specifications before choosing.
Final Recommendation
For a compact bathroom, the BAYROLL is the most compelling option based on its listed 25.5-inch depth, provided its angle-valve clearance works with your plumbing. If you want a low-flow system with hands-free flush options, consider the CASTA DIVA. For a simpler dual-flush design, the CANEST T01 is worth comparing. Whichever model you choose, confirm the rough-in, seat height, dimensions, flush details, and included installation parts before ordering.
