Adding a toilet to a basement or basement bathroom can add a lot of value to your home. In fact, adding a basement bathroom can add anywhere from $20,000 to $50,000 to your home’s value! Installing a toilet in a basement is similar to installing a toilet in any other location. However, there are a few differences (especially related to the drain piping) that make installing a bathroom toilet in a basement a bit more difficult.
When installing a toilet in a basement, you have three different options.
First, you can install a standard toilet – but that will involve breaking up the basement slab concrete so that you can run the drain piping underground to your main sewer drain.
Second, you can install a sewage ejector pump system that will received sewage from the basement toilet by gravity and then pump it up to a higher elevation to leave your home.
Finally, you have the option to install an UpFlush toilet that includes an integral sewage pump that will pump the flushed water to a higher elevation without you ever needing to demolish your basement floor.
This article will outline the three methods for adding a toilet to your basement so that you know exactly what basement toilet installation method is best for you.
How to Install a Standard (Gravity Drain) Toilet in a Basement
Determine If You Are Able to Connect to Your Existing Sanitary Sewer by Gravity
To install a standard toilet in your basement, you first need to confirm that you will be able to connect the toilet drain piping to your existing sanitary sewer. Some basements will not allow for you to add a standard toilet since there will not be sufficient slope for the sewage to drain to your home’s existing sewer stack. To determine if you will be able to install a standard toilet in your basement, you will first need to locate the main sewer drain. If it leaves your house above the slab, it is likely that you will not be able to install a standard toilet in your basement. If the main sewer drain goes down vertically into the floor of your slab, you may be able to connect your new toilet to it by gravity.
It is recommended that you consult with a local licensed plumber to determine if adding a standard gravity drain toilet will be feasible in your basement.
Once you have determined that a standard toilet can be installed in your basement, you need to begin planning out your basement bathroom layout.
Plan your Basement Bathroom Layout With a Specific Focus on the Toilet Location
When planning the location for your basement bathroom toilet, you want to position the toilet so that there will be a direct route from the toilet drain to the main sanitary sewer stack. Additionally, you will want to position the center of the basement toilet flange either 10″, 12″, or 14″ from the finished wall of your basement bathroom – depending on the “rough in dimension” for your toilet.
For my basement bathroom toilet, I used a 10″ rough-in toilet – so I positioned the center of the toilet flange 10.5″ from the unfinished wall (which will be 10″ from the FINISHED wall once I install 1/2″ drywall).
Once you have determine the rough-in dimensions for your basement toilet, it is often helpful to sketch up the basement bathroom layout using graph paper. This will help to visualize the dimensions of your basement bathroom and make changes based on functionality and space.
Additionally, I recommend that you mark the outline for your basement bathroom on the basement floor slab using tape. This can be very helpful in visualizing the spacing for the basement bathroom and toilet before it is constructed.
For additional information on planning the layout for basement bathroom and permitting requirements, I recommend that you watch my “How to add a basement bathroom toilet” YouTube video below:
Once you have finalized the layout for your basement bathroom and the location of the toilet, you can begin installing the under slab toilet plumbing.
Install the Under Slab Plumbing for the Basement Toilet
In order to install the under slab plumbing for a basement toilet, you will need to demolish sections of the basement floor slab. To do this, a jackhammer and a concrete saw are needed. Although you can rent the tools required to demolish your basement floor slab, it is often recommended that you hire a licensed plumber to perform this work. By hiring a licensed plumber for the below slab plumbing, you will ensure that the slab demolition and the below slab plumbing is done correctly and in compliance with the local code requirements.
For my basement bathroom addition, I paid a local plumber $2,000 to demolish my basement slab, install the under slab 3″ PVC drain piping, and then to connect the 3″ toilet drain piping to my existing sanitary sewer pipe. Overall, it was money well spent (even though I own a jackhammer!).
Once the basement slab plumbing is in place, you want to ensure that it is sloping from your basement toilet towards the main sewer pipe leaving your home. Typically, a 1/4″ per foot is the minimum allowable slope for drain plumbing.
Backfilling the Under Slab Toilet Plumbing and Leveling the Basement Floor
After confirming that the under slab plumbing is up to code (and after any necessary permitting inspections), backfill the under slab toilet plumbing with concrete – ensuring that it is level with the surrounding basement slab.
Often times, it is difficult to get the backfilled concrete perfectly level with the surrounding basement slab. As a result, you may need to apply a self-leveling underlayment product to get the floor beneath the basement toilet perfectly level. For more information on leveling the basement floor beneath a basement toilet, you can watch my “How to apply a self leveling underlayment to a basement bathroom floor” video linked here.
Once you have the basement floor completely level in your basement bathroom (especially around the toilet), you can install the toilet flange.
Install the Basement Toilet Flange
To install the basement toilet flange, first cut the toilet drain pipe flush with the basement floor. I recommend a reciprocating saw for this, but an oscillating tool or a hack saw will also work.
Next, apply PVC primer and glue to the toilet flange and position it in place within the toilet drain pipe.
Hold the toilet flange in place for approximately 30 seconds to let the PVC glue set up.
Next, use a hammer drill to pre-drill the Tapcon Screw holes for the screws that will be used to to secure the toilet flange to the basement concrete floor slab. The size and type of concrete drill bit and concrete screws you use for securing the toilet flange to the basement slab will vary from application to application, but it is recommended that the screws be no shorter than 2″ in length.
Once you have predrilled the holes, secure the basement toilet flange to the basement floor slab using two, 2″ Tapcon Screws (or similar).
Install the Standard Toilet in the Basement Bathroom
With the toilet flange in place, install a wax ring (or a wax-free seal) on the toilet flange and secure it in place using “Johni Bolts”
After installing the wax seal (or wax free seal) to the toilet flange, lift the toilet over the Johni Bolts and then secure the toilet in place with the provided nuts and washers.
Shim around the bottom of the toilet as necessary to ensure that the basement toilet is perfectly level.
Hookup the potable water tank fill supply line
As the final step in the standard toilet basement installation process, connect the potable water supply to the fill valve on the toilet tank.
Conclusion – Installation a Standard Gravity Drain Toilet
Installing a standard toilet in your basement is advantageous because, unlike the other two options, it does not require regular maintenance or pump replacement. However, the need to demolish the floor slab makes this type of basement toilet installation quite labor intensive.
For a step-by-step video showing the entire basement bathroom toilet installation process from start to finish, I recommend that you check out my “How to add a Toilet to a Basement Bathroom” video below:
How to Install a Basement Toilet with a Sewage Ejector Pump System
In some basements, it will not be possible to connect the toilet drain pipe directly to the sanitary sewer by gravity. If this is the case for your applications, you will need to install a “Up flush” toilet (discussed next) or you will need to install a sewage ejector pump kit.
A sewage ejector pump kit is a system designed to pump sewage and wastewater from below-grade locations, such as basements and bathrooms, up to the main sewer line or septic system. As mentioned previously, these kits are commonly used in situations where gravity drainage is not possible, and the sewage needs to be lifted / pumped to a higher elevation so that it can then discharge to the main sewer line. Think of a sewage ejector pump kit as a sump pump, except for sewage.
The basic components of a sewage ejector pump kit typically include:
Sewage Ejector Pump: This is the main pump responsible for pumping the sewage and wastewater from the pit to a higher elevation (usually your home’s main sewer stack). It is designed to handle solids and has a built-in grinder or macerator to chop up solid waste so that the pump and downstream piping does not clog.
Basin or Pit: The Sewage Ejector Pump is installed in a basin or pit in the floor of the basement. The basin collects the sewage and wastewater before it’s pumped out. A sewage ejector pump basin / kit is similar to a sump pump pit.
Check Valve: Most sewage ejector pump kits come with a check valve installed on the discharge pipe to prevent the pumped sewage from flowing back into the basin when the pump is not running. A check valve allows flow in one direction, but not the other.
Float Switch: Sewage ejector pump kits are typically equipped with a float switch that activates the pump when the sewage in the basin reaches a certain level.
Discharge Pipe: The pump is connected to a discharge pipe that carries the sewage from the basin to the main sewer line or septic system.
Installing a sewage ejector pump kit for a basement toilet involves several steps which are explained below:
Plan the Sewage Ejector Pump Kit Installation:
First, you will need to determine the location for the sewage ejector pump kit system. It should be in a spot where it can easily collect waste from the basement toilet while also being inconspicuous. Additionally, the sewage ejector pump will require electricity. As a result, ensure that the sewage ejector pump kit and pit will be in a location of an existing outlet (or where a new outlet can be installed)
Dig the Pit:
Once you have decided on the location for your sewage ejector pump system, you will need to dig a hole in the basement floor to create a pit for the sewage ejector pump. The size of the pit will depend on the pump and basin specifications provided in the pump kit. Since sewage pump pits are typically installed within a basement, you will likely need to break up the concrete slab with a jackhammer before you can start digging. This type of work is very labor intensive and requires special tools (jackhammer, concrete saw, etc.) and, as a result, you may want to contract with a local plumber or contractor for the excavation and installation of your sewage ejector pump kit.
Install the Sewage Ejector Pump Basin:
After digging a hole in the basement large enough to fit the sewage ejector pump kit, place the basin or pit into the hole. Ensure it is set securely and level. Typically, the void space around the sewage ejector pump basis will be backfilled with dirt or concrete.
Install the Sewage Ejector pump:
After securing the sewage ejector pump basin, position the sewage ejector pump inside the basin according to the manufacturer’s instructions. Typically, the pump will be placed so that it is resting on the floor of the basin.
Install the Sewage Ejector Pump Kit Piping
Once the basin and sewage ejector pump are installed, connect the inlet pipe from the basement toilet to the sewage ejector pump system. Typically, 1.5”, 2”, or 3” PVC pipes and fittings are used for these plumbing connections, but consult with your local plumbing codes for specific requirements for your area.
As noted above, it is highly recommended that you (or a plumber) install check valve on the discharge pipe to prevent sewage from flowing back into the basin after the pump shuts off. Next, connect the discharge pipe to the pump’s discharge outlet and connect it to the main sewer pipe leaving your home. Ensure the pipe slopes slightly downward to allow for proper drainage. Finally, you will want to ensure that the sewage pump kit is properly vented in accordance with location plumbing codes. Vent pipes allow air to escape from the system and help to prevent “airlocking” in the pump. Ensure that all pipes are secured using pipe straps or hangers to prevent movement during pump operation.
Electrical Connection – Plug in the Sewage Ejector Pump:
At this stage, plug in the sewage ejector pump to a dedicated electrical circuit. Follow the pump manufacturer’s instructions for wiring and voltage required for the specific sewage ejector pump system.
Final Steps to Complete the Sewage Ejector Pump Installation:
At this stage, you will want to test the entire sewage ejector pump system to ensure successful operation. It is typically recommended that testing be performed with potable water first. Once you have confirmed that the system is functioning properly, cover the pit with a lid or cover designed for the purpose. Ensure everything is sealed properly to prevent odors and provides safety.
Conclusion – Installation a Sewage Ejector Pump System
The installation of a sewage ejector pump system is an involved process that includes various steps (demolition, installation, plumbing connection, venting connections, etc.). Additionally, there are specific plumbing codes (and likely permits) that are involved with installing a sewage ejector pit in your home. As a result, it is recommended that you consider hiring a professional plumber to ensure the job is done correctly and safely. Also, be sure to consult the installation manual provided by the sewage ejector pump manufacturer for specific instructions and guidelines related to the sewage ejector pump system that you are installing.
How to Install an UpFlush Toilet
Installing an UpFlush toilet, also known as a macerating toilet, is generally more straightforward than installing a traditional gravity-fed toilet because it doesn’t require connection to a sewage drain pipe beneath the basement floor slab. Since UpFlush toilets are typically installed in basements, this means that the labor involved with demolishing the basement floor slab can be avoided. Instead of a gravity drain flushing mechanism, UpFlush toilets use a built in macerator pump to break down waste and pump it up to your existing sewer line. Although UpFlush toilets are typically more convenient to install in a basement than a standard gravity drain toilet, they are often 4x-5x more expensive.
To install an UpFlush toilet in your basement bathroom, you will want to follow these general steps.
Choose the Location for the UpFLush Toilet
Select a suitable location for the upflush toilet. Ensure it is near a power source for the macerator pump and has access to a water supply for the tank fill valve. Often times, it is helpful to plan out your UpFlush Toilet layout by sketching the bathroom dimensions on graph paper.
Prepare the Floor for the UpFlush Toilet Installation:
Ensure the floor is level and clean. Most basement floors tend to be uneven, so be sure to correct any issues using a self-leveling concrete underlayment product (discussed previously) before installing the UpFlush toilet. If you are installing the UpFlush toilet on a concrete floor, use a hammer drill to create holes for the anchor bolts.
Assemble the UpFlush Toilet:
Follow the manufacturer’s instructions to assemble the UpFlush toilet bowl and tank. This may involve attaching the tank to the bowl and connecting the flush mechanism.
Most UpFlush toilets have an integral tank, and macerator pump that is connected to the back of the toilet. During this stage of the project, ensure that the toilet, macerator pump, and tank are assembled and ready for installation.
Connect the Plumbing:
Connect the discharge pipe from the macerator pump to the existing sewer line or a suitable drain pipe. Use PVC pipes and fittings as needed. Ensure the discharge pipe is properly vented.
Next, connect the water supply line to the UpFlush toilet that will be used to fill the flush tank. Typically, all plumbing work should be performed by a licensed plumber in your area. Consult with local plumbing codes regrading installation standards and required permits for the installation of an UpFlush toilet in your basement.
Secure the UpFlush Toilet to the Floor:
Set the toilet bowl in place over the floor flange. Insert anchor bolts through the base of the toilet and secure them to the floor. If you are installing your UpFlush toilet on a concrete basement slab, you will typically want to use “Tapcon” masonry screws to attached the toilet flange to the concrete. Use a level to ensure the toilet is level (shim as necessary).
Complete the UpFlush Toilet Installation:
Complete the installation of the toilet tank and connect it to the bowl. Next, plug in the macerator pump to an outlet (as recommended by the manufacturer).
Follow the manufacturer’s instructions for securing and connecting these components. Finally, test the entire UpFlush toiletsystem by filling the tank and flushing the toilet to confirm that the built in macerator pump is working properly.
Once the system has been tested and is functioning properly, secure any loose pipes, tighten connections, and make any final adjustments.
Always refer to the specific instructions provided by the manufacturer of your UpFlush toilet kit, as different toilet models may have unique requirements. If you’re unsure about any part of the installation process, consider consulting a professional plumber. Additionally, be aware of local building codes and regulations to ensure compliance with the law.
Conclusion – Installation an UpFlush Toilet
Although UpFlush toilets are a great option for basements when you don’t want to deal with the hassle of breaking up the concrete floor, they do come at a price. Unlike traditional toilets that cost around $200, an UpFlush toilet can cost upwards of $1,000! I recommend that you discuss the various basement toilet installation options with a local plumber before deciding on what toilet system is best for your application.
As you can see, UpFlush Toilets can be expensive…
Before concluding this basement toilet installation article, let’s take a quick look at some of the most common questions that people have regrind the installation of a basement bathroom toilet.
Common questions related to adding a toilet to a basement bathroom:
Is it difficult to add a toilet to a basement?
Yes – Adding a toilet to a basement is a rather involved process. Typically, you will need to demolish the basement slab in order to install plumbing. This requires special tools (jackhammer, concrete saw, etc.) and is very labor intensive work. Additionally, adding a toilet to a basement requires considerable knowledge of plumbing and venting in order to make the connections to the toilet and the main sewer line. Overall, it is difficult to add a toilet to basement and it is recommended that you consult with licensed plumber prior to proceeding with the work.
How much does it cost to add a toilet to a basement?
The cost to add a toilet to a basement varies quite a bit depending on various factors. If you are installing a standard toilet that drains by gravity to your main sewer line and you do all of the labor yourself, the cost can be as low as $700 for materials. However, if your basement toilet installation project involves specialty materials (Sewage Ejector pump kit, Up Flush toilet, etc.) and you hire plumber to install the toilet, the cost can be as high as $5,000.
What is an UpFlush toilet?
An UpFlush toilet, also known as a macerating toilet or a grinder toilet, is a type of toilet system designed for installations where gravity drainage is not possible or practical. These toilets use a macerator pump to grind waste into slurry, allowing it to be pumped upward to the existing sewer line or septic tank.
Can I install a basement toilet without breaking concrete?
Yes – UpFlush toilets can be installed in a basement and do not require you to break any of the basement slab concrete. However, this type of toilet is significantly more expensive than a standard “gravity drain” toilet and requires an electrical connection (to power the pump that is integrated into the toilet).
Conclusion – Adding a Toilet to Your Basement Bathroom
Although adding a toilet to a basement bathroom is a rather involved process, there are various different methods for achieving a successful installation. Whether you go with a standard gravity drain toilet, a Sewage Ejector Pump Kit, or an UpFlush toilet, installing a toilet in a basement bathroom is a great way to add value and functionality to your home.
For additional information on How you can add a bathroom to your basement, I recommend that you check out my “How to Add a Basement Bathroom” YouTube Series which covers every aspect of the basement bathroom addition process.
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