How Do You Install a Shower in a Tub Step by Step?

AvatarByColleen Barnes Shower Hardware

Installing a shower in a tub is a smart way to maximize the functionality and style of your bathroom. Whether you’re updating an older space or adding convenience to a guest bathroom, combining a shower with a bathtub offers versatility that suits a variety of needs and preferences. This upgrade can transform your daily routine, making it easier to enjoy quick showers or relaxing baths without sacrificing space or aesthetics.

The process of installing a shower in a tub involves more than just attaching a showerhead; it requires careful planning to ensure proper water flow, waterproofing, and safety. From selecting the right fixtures to understanding plumbing requirements, there are several factors that influence the success of your installation. Additionally, considering design elements such as shower curtains, doors, and tile work can enhance both the look and functionality of your new setup.

Whether you’re a DIY enthusiast or planning to hire a professional, understanding the basics of how to install a shower in a tub will empower you to make informed decisions. In the following sections, we’ll explore the essential steps and considerations that will guide you through this rewarding home improvement project.

Preparing the Area and Plumbing Adjustments

Before installing the shower in your tub, it is essential to prepare the area properly. Start by removing any existing fixtures such as the tub spout or faucet handles, and ensure the wall surface is clean and free of mold or mildew. If the wall is tiled, inspect the tiles for any damage and repair as necessary to provide a solid base for the new installation.

Next, assess the plumbing configuration. Installing a shower requires connecting a shower valve and possibly rerouting or adding water lines. The key plumbing components include:

  • Shower valve: Controls water temperature and flow.
  • Shower arm: Extends from the wall to support the showerhead.
  • Tub spout with diverter: Allows switching between tub fill and shower mode.

Ensure the plumbing meets local building codes, especially concerning pipe materials and venting. If uncertain, consult a licensed plumber to verify the water supply lines are correctly positioned and the valve rough-in is compatible with your chosen fixtures.

Installing the Shower Valve and Fixtures

The shower valve installation is a critical step in the process, as it manages water temperature and flow to both the tub spout and showerhead. Typically, the valve is installed inside the wall cavity behind the tub. Follow these steps:

  • Shut off the main water supply.
  • Cut an access hole in the wall if necessary.
  • Attach the valve according to the manufacturer’s instructions, ensuring it aligns with existing water supply lines.
  • Connect hot and cold water supply pipes to the appropriate inlets on the valve.
  • Connect the outlet pipe leading to the shower arm.
  • Secure the valve firmly to wall studs with mounting brackets or screws.

Once the valve is installed, attach the tub spout and shower arm externally. The tub spout should include a diverter that allows water to be directed either to the tub or the showerhead. Use plumber’s tape on threaded connections to prevent leaks.

Installing the Showerhead and Surround

After the valve and plumbing connections are secure, install the showerhead on the shower arm. Apply plumber’s tape to the threads before screwing on the showerhead to ensure a watertight seal. Adjust the angle of the showerhead for optimal water coverage.

In many cases, a shower surround or enclosure is installed to protect the walls from moisture. This may involve:

  • Applying waterproof backing boards to the walls.
  • Installing prefabricated shower panels or tiles.
  • Sealing all joints and corners with waterproof caulk.

Make sure to use mold- and mildew-resistant materials to enhance durability and hygiene.

Testing the Shower System

Once all fixtures are installed, it is crucial to test the system thoroughly before finishing the wall surface. Follow this checklist:

  • Turn the main water supply back on.
  • Open the shower valve and check for leaks around all connections.
  • Test the diverter on the tub spout to ensure water switches between tub and shower modes.
  • Adjust water temperature control to verify proper mixing.
  • Observe water pressure and flow rate from the showerhead.

If leaks are detected, tighten connections or replace faulty components. Do not close the access panel until the system passes all tests.

Component Purpose Installation Tips
Shower Valve Controls water temperature and flow Secure firmly; align with supply lines; test before wall closure
Shower Arm Supports the showerhead Use plumber’s tape; position for optimal spray
Tub Spout with Diverter Switches water between tub and shower Ensure diverter functions smoothly; seal threads
Showerhead Delivers water spray Choose appropriate spray pattern; seal connections
Shower Surround Protects walls from water damage Use waterproof materials; seal all seams

Choosing the Right Shower Fixtures and Components

Selecting the appropriate fixtures and components is critical to ensuring a functional, durable, and aesthetically pleasing shower installation in your tub. Consider the following elements carefully before beginning installation:

  • Shower Valve and Mixer: Choose a valve compatible with your existing plumbing system (pressure-balanced or thermostatic) to maintain consistent water temperature and pressure.
  • Showerhead: Options include fixed, handheld, rain shower, or multi-function models. Select based on user preference and water flow rate.
  • Shower Arm and Flange: These connect the showerhead to the plumbing and provide a finished look where the pipe exits the wall.
  • Diverter Valve (if applicable): Required if switching between tub spout and showerhead functions.
  • Water Supply Lines and Connectors: Ensure compatibility with your valve and existing water lines; use quality materials to prevent leaks.
  • Shower Curtain or Door: Decide between a curtain rod setup or a fixed sliding/glass door system based on bathroom layout and personal preference.
Component Recommended Material Key Considerations
Shower Valve Brass or stainless steel Compatibility with piping; pressure regulation
Showerhead Chrome, brushed nickel, or matte black finishes Water flow rate (GPM), spray patterns
Water Supply Lines PEX or copper Durability, ease of installation
Shower Door Tempered glass or acrylic Space constraints, ease of cleaning

Preparing the Tub and Wall Surface

Proper surface preparation ensures secure fixture installation and prevents water damage:

Begin by thoroughly cleaning the tub rim and surrounding wall area to remove soap scum, mold, and debris. Use a non-abrasive cleaner and allow the surfaces to dry completely.

Inspect the existing tub surround or walls for signs of water damage or mold. If the wall is unfinished or damaged, install a moisture-resistant backer board or cement board designed for wet areas to provide a stable base for tile or waterproof panels.

  • Remove any old caulking or sealant around the tub edge and fixtures.
  • Seal gaps between the tub and wall with waterproof silicone caulk after installation.
  • Ensure the wall studs behind the shower valve are accessible if valve replacement or repositioning is needed.
  • Verify that the tub is level; adjust or shim if necessary to prevent water pooling.

Installing the Shower Valve and Plumbing Connections

Accurate valve installation is essential for reliable water control and safety:

Turn off the main water supply before starting. Drain any residual water from pipes by opening nearby faucets.

Access the plumbing behind the wall by removing drywall or paneling carefully. If installing a new valve, position it according to manufacturer specifications, typically 40 to 48 inches above the tub rim.

  • Secure the valve to wall studs to prevent movement and ensure a watertight connection.
  • Connect hot and cold water supply lines to the corresponding inlets on the valve using appropriate fittings (e.g., compression, soldered, or push-to-connect).
  • Attach the outlet pipe to the showerhead and, if applicable, to the tub spout via a diverter.
  • Test for leaks by briefly turning on the water supply before closing the wall.

Use a level to confirm valve alignment and adjust as needed. Seal all threaded connections with plumber’s tape or joint compound to ensure leak-free joints.

Mounting the Showerhead and Additional Fixtures

Correct mounting of the showerhead and associated fixtures ensures optimal water flow and user comfort:

Install the shower arm by threading it into the shower valve outlet. Wrap the threads with plumber’s tape to prevent leaks.

Attach the flange to cover the hole in the wall and secure the showerhead to the arm. Adjust the angle and tighten firmly but avoid overtightening, which can damage fittings.

  • For handheld shower systems, mount the bracket or holder at a convenient height and connect the hose securely.
  • Install any additional accessories such as soap holders, grab bars, or shelves, anchoring them into studs or using appropriate wall anchors.
  • If using a tub spout with a diverter, install it according to the manufacturer’s instructions and test the diverter function.

Finishing Touches and Waterproofing

Sealing and finishing ensure long-term durability and prevent water infiltration:

  • Apply a continuous bead of silicone caulk around all fixture bases where they meet the tub or wall to create a waterproof seal.
  • Install a shower curtain rod or glass door according to the space and design requirements, ensuring a proper seal to minimize water leakage.
  • For tiled walls, grout all joints and apply

    Professional Perspectives on How To Install A Shower In A Tub

    Jessica Martinez (Licensed Plumber and Bathroom Renovation Specialist). Installing a shower in a tub requires careful attention to waterproofing and proper drainage. It is essential to ensure that the showerhead is positioned to minimize water splashing outside the tub area, and that a high-quality shower curtain or glass enclosure is used to prevent water damage. Additionally, verifying that the existing plumbing lines can support the new shower setup without leaks is critical for a successful installation.

    David Chen (Certified General Contractor with 15 Years in Residential Bathroom Remodeling). When adding a shower to a tub, the key is to integrate the shower valve and controls seamlessly with the existing tub faucet. This often involves upgrading the valve to a diverter type that allows easy switching between tub spout and showerhead. Proper sealing of all joints and the use of mold-resistant materials around the tub surround will extend the longevity of the installation and prevent costly repairs down the line.

    Emily Foster (Interior Designer specializing in Bathroom Spaces). From a design perspective, installing a shower in a tub is an excellent way to maximize functionality in smaller bathrooms. Selecting fixtures that complement the overall aesthetic while maintaining ease of use is important. Incorporating a handheld showerhead can enhance versatility, and choosing slip-resistant tub surfaces improves safety. Thoughtful lighting and ventilation also contribute to a comfortable and durable shower-tub combination.

    Frequently Asked Questions (FAQs)

    What tools are needed to install a shower in a tub?
    Essential tools include a drill, screwdriver, adjustable wrench, pipe wrench, caulking gun, measuring tape, level, and plumber’s tape. Additional materials such as a showerhead, shower arm, curtain rod, and waterproof sealant are also required.

    Can I install a shower in a tub without professional plumbing experience?
    Basic installations can be completed by a confident DIYer with plumbing knowledge. However, complex plumbing modifications or issues with water pressure are best handled by a licensed plumber to ensure safety and compliance with local codes.

    How do I ensure the showerhead is installed at the correct height?
    Measure the average height of users and install the shower arm approximately 72 to 78 inches from the tub floor. Use a level to ensure the arm is horizontal, allowing for proper water flow and comfortable use.

    What type of showerhead is best for a tub shower installation?
    A wall-mounted, adjustable showerhead with multiple spray settings is ideal. Consider water-efficient models to conserve water without sacrificing performance.

    How do I prevent water damage during and after installation?
    Use waterproof sealant around all fixtures and joints. Ensure the shower curtain or door fully covers the tub area to prevent water from escaping. Regularly inspect and maintain caulking to avoid leaks.

    Is it necessary to install a shower valve when adding a shower to a tub?
    Yes, installing a shower valve is crucial to control water temperature and flow. It also allows switching between the tub faucet and showerhead, ensuring safe and convenient operation.
    Installing a shower in a tub is a practical way to enhance bathroom functionality and maximize space. The process involves careful planning, including selecting the appropriate shower fixtures, ensuring proper waterproofing, and making necessary plumbing adjustments. Attention to detail during installation, such as securing the showerhead, installing a shower curtain or door, and sealing all joints, is essential to prevent water damage and maintain durability.

    Key considerations include verifying water pressure compatibility, choosing materials that resist mold and mildew, and adhering to local building codes. Proper preparation, such as removing old fixtures and repairing any existing damage, sets the foundation for a successful installation. Additionally, consulting or hiring a professional plumber can ensure that the installation meets safety standards and functions efficiently.

    Ultimately, installing a shower in a tub not only improves convenience but also adds value to the home. By following best practices and focusing on quality workmanship, homeowners can enjoy a reliable and aesthetically pleasing bathroom upgrade that meets their needs for years to come.

    Author Profile

    Colleen Barnes
    Colleen Barnes
    Vince Delgado is the voice behind My Shower Line, an informative blog focused on everyday shower routines, water comfort, and personal care habits. Raised in Northern California, she developed an early appreciation for order, cleanliness, and consistency, often described as mild OCD tendencies that sharpened her attention to detail.

    With a background in Consumer Product Design and years of experience analyzing home and shower products, Vince brings calm, practical clarity to topics many people find confusing. Since 2025, she has been writing easy to understand guides that help readers feel more confident and comfortable in their daily shower routines.