Skip to Content

Do you need double plumbing for double vanity?

The short answer is that it depends on the layout of your bathroom, the type of vanity you have chosen, and the local plumbing codes in your area. Generally speaking, double vanities do require two separate plumbing lines because each sink needs to be connected to the main water line in order to be functional.

If you have an L-shaped vanity or an off-center vanity, you will need to have separate plumbing lines for each sink. Additionally, it is important to note that some local plumbing codes require double vanities to have two separate water sources and/or two separate p-traps, so it is important to consult local codes before beginning your project.

Finally, if you are installing a double vanity with a large single undersink cabinet, two separate plumbing lines may not be necessary. However, it is best to consult with a professional plumber before making a final decision.

Does a double vanity need two drains?

Yes, a double vanity typically needs two drains. To install a double vanity, the plumbing needs to be connected to both sides, including a sink drain and sometimes a garbage disposal, for each side. This typically means running two drains for the double vanity so that water drains away from each side.

Because of this, it’s best to have a plumber install a double vanity because of the complexity of the job. If done incorrectly, a clog or an improperly fit drain can cause major water damage in a bathroom.

Can you put double sink vanity where single sink was?

Yes, it is possible to put a double sink vanity where a single sink was. This can be done by making some minor modifications to the existing vanity and plumbing of your bathroom. First, if the existing sink is larger than the new one, you may need to cut the counter top and install a new piece of counter to fit the double sink vanity.

Next, the vanity will need to be secured to the wall and the plumbing should be adjusted with T-connectors, a diverter valve, and additional pipes and connectors to appropriately route the double sink’s water supply.

Finally, the plumbing connections should be tested for leaks and the double sink vanity should be sealed with caulk. This project requires some specialized plumbing knowledge, so we recommend hiring a professional to assist with the installation.

Can you connect a double sink to a single drain?

Yes, you can connect a double sink to a single drain. Plumbers use a device, called a garbage disposal “Y-connector”, to secure a double sink to a single drain. This device is installed beneath the sink and attaches the two sinks to one drain line.

To connect the double sink to the existing drain, you will have to cut the waste pipe that runs between the two sinks, attach the Y-connector, and extend it to the existing drain line. It is important to measure and cut properly to ensure a proper fit.

You will also need to secure the Y-connector with screws to ensure a tight seal. Once the Y-connector is in place, you will also have to install a flexible hose from the garbage disposal to the Y-connector.

Once you have all of the necessary materials, it shouldn’t take more than an hour or two to connect a double sink to a single drain.

Can you change a single vanity to a double vanity?

Yes, you can change a single vanity to a double vanity in most cases. Depending on the type of sink, setup, and cabinet you may be able to do the work yourself or you may need to hire professional help.

Generally the process involves replacing the countertop and sink, and possibly refitting the cabinet to accommodate the two basins. If the plumbing of the existing sink is already in place then the job will involve simply disconnecting the existing sink and connecting the two new basins.

However, depending on your current setup, there may be additional considerations to keep in mind. For example, if the two basins will be too close together for comfortable use, you may need to move the drain and/or pipes.

Alternatively, you may need to rework the cabinet space and/or the countertop to accommodate the double vanity. Overall, the best thing to do is assess the type of sink, setup, and cabinet you have and then consider if the job is something you feel comfortable doing yourself, or if you should consult a professional.

How should a double sink drain be plumbed?

A double sink drain should be plumbed with 1-1/4 inch pipe, a double sink drain tailpiece, a dishwasher tailpiece, and two 90 degree elbows. First, the sink drain should be connected to the drain opening in the wall with the 1-1/4 inch pipe, making sure that all the threaded joints are sealed with plumber’s putty.

Next, the double sink tailpiece should be connected to the wall drain. It will have two separate, parallel lines that go into the tailpiece. After that, the dishwasher tailpiece can be connected to the sink drain line and the countertop.

This tailpiece should also have two separate vents and should be connected to the dishwasher. Finally, two 90-degree elbows should be connected to the upper part of the double sink tailpiece, with one line heading to left the side and one going to the right.

This will allow both sides of the sink to drain separately with gravity.

How much does it cost to install a double vanity?

The cost of installing a double vanity depends on a range of factors, including the materials chosen, the size of the vanity, the labor costs and the type of installation desired. Generally, the cost to install a basic double vanity can range anywhere from $400 to $1,500, with some higher end designs costing as much as $3,500 or more.

When choosing the materials, it’s important to keep budget in mind, as more expensive materials such as marble or granite will add to the overall cost. Additionally, if you’re opting for a pre-fabricated vanity, there may be additional costs for hooking up sinks and drains, unless you already have them in place.

The cost of labor for installation can vary depending on the location and the availability of qualified professionals. Finally, the type of installation will also affect the cost – some may require additional carpentry or plumbing work that could further add to the overall expense.

All these variables make it difficult to give an exact cost for installation. The best way to get an accurate estimate of the cost of installing a double vanity is to get quotes from qualified professionals.

Can a double sink share a trap?

Yes, a double sink can share a trap. A double sink is considered a single plumbing fixture and all plumbing fixtures must be connected to a common drain line under the structure that terminates at a sewer or septic tank.

In most cases, the trap will be located beneath the sink, connecting to the P-trap connection where the drain line and vent line meet. Having two sinks share a trap is perfectly fine, both from the perspective of plumbing code and water efficiency.

However, if you have only one trap, it should be installed centrally located beneath the sinks. This will provide the traps enough room to work as designed, and will ensure that the water flows as intended.

Can you change the location of a sink in a bathroom?

Yes, it is possible to change the location of a sink in a bathroom. You may want to consider relocating a sink to a different spot in the bathroom if you want to change the overall aesthetic or for more convenience.

This may require re-plumbing the sink to accommodate for the new location. It is important to note that any plumbing changes could require permits in some areas and you should be sure to check your local codes and adhere to all safety standards.

In some cases, because of the type of sink and its plumbing, it may not be possible to move it safely. Additionally, if you are considering a major change in the layout of the bathroom, it is recommended to employ the services of a qualified contractor, to ensure the job is done correctly.

What should you not put down a bathroom sink?

It is generally advised not to flush or put anything down the bathroom sink that isn’t biodegradable. This includes items such as cotton swabs/balls, paper towels, tissue paper, cat litter, dental floss, cigarette butts, q-tips, and feminine hygiene products.

These items may seem small and harmless, but can add up and cause major clogs in your plumbing system. Additionally, items such as chemicals, medications, and oils should not be poured down a sink drain as these can end up in water systems and are toxic to both humans and animals.

If these products need to be disposed of, it is best to take them to a designated hazardous waste facility or follow the instructions on the container.

How hard is it to reroute plumbing?

The difficulty of rerouting plumbing depends on a number of factors, such as the type of plumbing, the existing layout of the plumbing, and the desired layout of the plumbing. It also depends on the type of material used to create the plumbing, the age of the plumbing, and the condition of the pipes.

Generally, the more complex the desired layout, the more difficult rerouting plumbing can be.

In some cases, basic plumbing can be rerouted fairly easily. For example, simply moving a toilet from one wall to another is a relatively straightforward job for a professional plumber. However, rerouting more complex plumbing can be much more difficult.

Reorganizing a large portion of a home’s plumbing system requires a significant amount of work and often requires the help of multiple plumbers.

The amount of work involved in rerouting plumbing can also be greatly affected by the area in which the plumbing is located. It can be difficult to reroute plumbing in tight, awkward spaces, such as crawl spaces and attics.

Generally, the easier it is to access the plumbing, the easier it is to make changes.

In summary, the difficulty of rerouting plumbing depends on a variety of factors, but it can typically range from relatively simple to quite complex. It is always best to consult with a professional plumber to determine the best course of action for any plumbing rerouting.

Can 2 sinks share the same water line?

It is possible to have two sinks share a single water line, especially in small apartment bathrooms or in powder rooms. This type of setup requires two T-shaped fitting valves so that the water can be diverted to either sink.

The two valves should be close to each other, and it is important to use plumber’s tape or waterproof void around the fittings to ensure a waterproof seal. When two sinks are in place, it is also necessary to install a tee in the line so that the two sinks are connected.

Once the plumbing is connected, it is necessary to check the lines periodically to ensure all water is draining properly. Additionally, if the two sinks are in different locations in the house, it’s important to check for any water leaks or inconsistent water pressure.

However, if the two sinks are sharing the same p-trap, it is important to make sure the water is not backing up between the two drains.

Overall, having two sinks share the same water line is possible and can be a cost effective solution for a bathroom renovation. However, it is important to be aware of any possible water issues that may arise.

Can I turn my single sink into a double?

Yes, it is possible to turn a single sink into a double sink, although it isn’t typically a small undertaking. Depending on the layout and type of sink you currently have, it may be easier or more difficult to do.

Generally, if your single sink is undermounted, it will be relatively simple to upgrade to a double sink. If it is drop-in, it might be more difficult.

First, you’ll need to check if your countertop has enough room for a double sink and make sure the correct plumbing connections exist. If your countertop does not have enough room, you may need to replace it.

You’ll also need to obtain a double sink bowl, as well as a faucet and drain assembly kit. Make sure the bowl and the faucet both have the same hole spacing for easy installation.

Once you have the necessary supplies, you’ll need to carefully measure the space for the sink basin to ensure it fits properly. Make sure to note the cutout template when you purchase the basin, as this will be very useful.

You should also review instructions on how to properly install the sink and drain assembly.

To complete the job, you’ll need to cut a hole in the countertop according to the space you measured, insert the sink and drain assembly, and then attach the faucet. You’ll also need to connect the proper supply lines to the faucet and drain assembly.

Once complete, the converted double sink should be ready for use. It is always recommended to hire a professional plumber if you are unsure of installing the necessary components yourself.

What size drain pipe for two sinks?

When choosing a drain pipe size for two sinks, 2-inch diameter pipes should be used for both the inlet and outlet pipes. This measurement reflects the drain size for two standard sink units. If the sink drains are installed in a long run, a larger 2.

5 inch drain pipe should be used instead to ensure an effective flow of water. Additionally, it is important to choose the correct material for pipes. ABS plastic or PVC are popular options for drain pipes as they are tolerated by most household chemicals and withstand temperature differentials.

It is recommended to obtain the pipes and fittings necessary before starting the installation process.