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Best Toilet and Sink Combo 2024 (Reviews & Ratings)

If you're struggling to fit everything in a smaller than average bathroom, you may want to consider getting yourself a toilet with a sink on top. These can be a great way too free up floor space and ensure you don't feel too closed in while visiting the washroom.

Similar designs are often found in prisons, but they have made their way into the residential market due to their helpful space saving properties.

Our pick

Sink Twice

This is a simple but effective solution to your hygiene needs. By removing the necessity of a stand alone sink users will be able to work with the limited space they do have better.

It slots over the tank in place of the lid and will automatically turn on once you flush the toilet. Once the tank is refilled, it shuts off itself.

Compare products

Sink Twice Sink Again
Model number 33-43 cm N/A
Dimensions 8.8 x 17 x 2.2" 9.2 x 19.5 x 2.8"
Color White White


These combined toilet and sink units have many benefits. They are known as a 2 in 1 solution which can help you save floor space. Instead of having to install a freestanding basin, you'll only need to install it over where the tanks lid usually sits. This can free up space for alternative sanitary ware like a shower or bath. This may not be an issue for larger homes, but in tight spaces, these are the innovations that can really improve things.

In many cases, it can be cheaper to fit these over your standard basin styles. Buying each piece of hardware separately can be expensive.


Despite the many benefits, there are several things you need to think about before you purchase anything. The first being that there isn't a lot of choice in terms of style, shapes, and design. If you're looking for something aesthetically pleasing to suit your needs, there are limitations.

You'll need to make sure your tank is the correct size. Not all of these products will be compatible, so ensure you understand the dimensions required. You'll find many are too wide or project too far from the wall to make them viable.

List of in depth reviews

Sink Twice

A basic, but fully functional option that will help get the job done. It's ideal for saving floor space and will slot over tank sizes ranging between 14 inches and 16.8 inches. So the manufacturer leaves quite a few options to work with, although it may not fit larger tanks, so make sure you measure before you buy. The dimensions are listed as 8.8 inches by 17 inches by 2.2 inches.

You may have heard all about the various touchless flush systems, but what about the touchless hand wash? This model allows you to rinse your hand efter each bathroom visit automatically.

However, all benefits aside, users should not that these will only work with gravity fed units, not tankless or jet. It is also best suited to universal flushing valves from household names such as korky or Fluidmaster.

This will work well with toilets that use 1.28 gallon per flush, or low flow models. If you have a less efficient, 1.6 gallon unit, but want to stay with the same brand, they have something called sink again, which could meet your requirements.

Something else you'll want to consider is matching the colors with the other bathroom hardware such as sinks and the tank and bowl itself. This comes in a pretty standard white, so it will fit in with many color themes.

Sink Again

This unit has minimalist design. Great for people not looking to crowd their bathrooms too much. It's designed to fit on tanks that measure between 14 inches and 17.5 inches on the front and between 16.9 inches and 19.5 inches along the back. Each of these measurements are done without the lid on top. Make sure you take your tanks lid off too for accuracy.

If you're wondering how the taps are operated with no noticeable lever or handle, that's because it turns on automatically for a duration of around twenty seconds after every flush. It also shuts off itself.

Great for keeping water usage down in the home, and excellent for saving space. It's also finished in white keeping with the more traditional bathroom color themes.

Other things to consider

Bathroom layout - It doesn't matter if your room is rectangular or square, you'll need to plan which plumbing hardware is suitable to the space you own. If you're planning a full renovation, ensure you know the maximum toilet dimensions you can work with so that you're not fitting it too close to the walls or vanities.

When it comes to things like toilet weight limits you won't need to worry too much, as the average bowl can hold a lot of weight. But sizes and dimensions vary quite a lot.

Tank shape - While most tanks are rectangular on top, some are made specifically for corners. This tends to mean they have a triangular shape. Naturally the standard basin shapes aren't going to be suitable for this.

Consumer feedback - See what buyers are saying about the products you're interested in. This is an easy way to understand the strengths and weaknesses without making a purchase. We like to use big online shops for this purpose, Lowes, Home Depot, and Wayfair are all great examples as they tend to have plenty of customer reports. Look at the complaint sections to rule out things like leaks and loose fittings.

Trip lever location - In general, you're going to have a choice between a trip lever on the right or left hand side. These levers can be either mounted to the front or the side. You may want to reconsider getting a push button solution as the button are on top of the tanks usually, which won't be accessible with the basin on top.

Saving water - The amount of water used is directly tied to how many gallons of water the tank holds. The wide majority of which utilize 1.6 and 1.28 gallons. Where possible, we recommend getting something which saves thousands of gallons of water. Look for products with the WaterSense label, which are EPA certified.

Colors - Aesthetics play an important role in our decision making process. This ranges from getting the right shape and fit, to the various decorative touches applied on hardware. However, the color themes used are just as important and can make or break the look and feel of a room. Make sure you match the colors up as close as possible, cotton on cotton, beige on beige and so on.


These toilet sink combinations are an unusual way to save space in your bathroom. Many consumers will try to achieve this through special shelving, hooks, and bowl shape, but because it stacks on top of the tank, it removes the necessity of a freestanding basin.