How Can You Transform a Shower Into a Bathtub?

AvatarBySusan Benton General Bath Queries

Transforming a shower into a bathtub can be a game-changer for your bathroom, offering enhanced comfort and versatility without the need for a full remodel. Whether you’re looking to create a relaxing soak after a long day or accommodate the needs of a growing family, converting your existing shower space into a bathtub opens up new possibilities for your home. This upgrade not only adds functionality but can also increase your property’s appeal and value.

Many homeowners find themselves wishing for a bathtub in a space that currently only has a shower, but the idea of a major renovation can feel overwhelming. Fortunately, there are practical ways to approach this transformation that balance aesthetics, plumbing considerations, and budget. From selecting the right tub style to understanding the necessary modifications, the process involves thoughtful planning and smart choices.

In the following sections, we’ll explore the essential factors to consider when turning your shower into a bathtub, helping you navigate the options and prepare for a successful conversion. Whether you’re a DIY enthusiast or planning to hire professionals, this guide will equip you with the knowledge to make informed decisions and achieve the bathroom upgrade you desire.

Assessing Your Existing Plumbing and Space

Before converting a shower into a bathtub, it is essential to thoroughly assess the existing plumbing setup and the physical space available. This evaluation will help determine the feasibility of the project and identify any modifications required for proper installation.

Start by inspecting the drain location. Showers typically have a floor drain positioned for efficient water runoff, whereas bathtubs require a drain at the tub’s base, often at one end. If the existing drain is not aligned with the proposed bathtub drain, plumbing adjustments will be necessary. Additionally, verify the water supply lines to ensure they can accommodate the faucet configuration of a bathtub, which usually includes a spout and a diverter for a showerhead.

Space constraints are another critical consideration. Bathtubs generally require more floor space than showers, so measure the shower enclosure dimensions carefully. The standard bathtub size is approximately 60 inches long, 30 inches wide, and 14-16 inches deep. If the shower area is smaller, you might need a smaller tub or consider custom solutions.

Key factors to evaluate include:

  • Drain location and compatibility
  • Water supply line positioning
  • Available floor space and enclosure dimensions
  • Wall structure and material for tub installation support

Preparing the Shower Area for Conversion

Proper preparation of the shower area is crucial for a successful bathtub installation. This involves removing existing fixtures, ensuring waterproofing, and reinforcing the floor and walls as needed.

Begin by dismantling the shower enclosure, including doors, panels, and the shower base or pan. Carefully remove the shower pan to expose the subfloor and drain assembly. Inspect the subfloor for any damage or rot, especially if water has penetrated beneath the shower. Repair or replace the subfloor if necessary to provide a sturdy foundation for the bathtub.

Waterproofing is vital to prevent leaks and water damage. Since bathtubs hold standing water, the surrounding walls and floor must be protected with a waterproof membrane or cement board. Apply waterproofing materials according to manufacturer instructions, paying special attention to seams and corners.

Floor reinforcement may be required, particularly if the existing subfloor is not designed to support the weight of a filled bathtub and a person. Consult local building codes to ensure compliance.

Modifying Plumbing for Bathtub Installation

Adapting the plumbing system is one of the more technical steps in converting a shower into a bathtub. Depending on the drain and water supply locations, modifications may range from minor adjustments to extensive rerouting.

The drain assembly must accommodate the bathtub drain and overflow. If the current shower drain is not positioned at the tub’s drain end, the drain pipe will need to be relocated. This typically involves:

  • Removing the existing drain trap and piping
  • Extending or rerouting the drain line to the new location
  • Installing a tub drain and overflow assembly

Water supply lines may require repositioning to align with the bathtub faucet and spout. In some cases, new piping must be added or existing lines extended. Ensure all connections are secure and leak-free.

Because plumbing work can be complex and requires adherence to local codes, it is advisable to consult or hire a licensed plumber. They can ensure proper venting and drainage, which are critical for tub function and preventing sewer gas escape.

Selecting and Installing the Bathtub

Choosing the right bathtub involves considering size, material, style, and installation type to fit your space and preferences.

Common bathtub materials include:

  • Acrylic: Lightweight, affordable, and easy to clean.
  • Fiberglass: Economical but less durable.
  • Cast Iron: Extremely durable but heavy and costly.
  • Steel: Durable with an enamel finish, moderately priced.

Installation types vary:

  • Alcove tubs: Fit into a three-wall enclosure, common for shower conversions.
  • Freestanding tubs: Stand alone and require more space.
  • Drop-in tubs: Installed within a framed deck or enclosure.

For shower-to-tub conversions, alcove tubs are typically preferred due to their compatibility with existing walls.

Installation steps:

  • Place the tub in position to verify fit.
  • Connect the drain and overflow assembly.
  • Secure the tub to the wall studs per manufacturer instructions.
  • Seal the edges with waterproof caulk.
  • Install the faucet and showerhead fixtures.

Comparison of Bathtub Materials and Installation Considerations

Material Weight Durability Cost Installation Notes
Acrylic Light Moderate Low to Medium Easy to install; requires proper support to avoid flexing
Fiberglass Light Low to Moderate Low Prone to scratching; may need reinforcement
Cast Iron Very Heavy High High Requires strong floor support; professional installation recommended
Steel Heavy High Medium Less heavy than cast iron; durable finish

Finishing Touches and Waterproofing

After the bathtub is installed and plumbing is connected, focus on finishing the surrounding area to ensure water resistance and aesthetic appeal.

Install new wall surrounds or tiles around the bathtub to protect the walls from water exposure. Use waterproof backer boards and mold-resistant grout for durability.

Assessing Your Existing Shower Setup

Before converting a shower into a bathtub, it is essential to evaluate the current shower area, plumbing, and structural layout. This initial assessment ensures compatibility with bathtub installation and identifies potential challenges.

Key factors to consider include:

  • Shower Dimensions: Measure the length, width, and height of the shower enclosure. Standard bathtubs require a minimum length of 60 inches and a width of at least 30 inches.
  • Drain Location: Verify the position of the drain relative to where the bathtub drain will be. Bathtub drains are typically centered at one end, so existing drain placement can affect the installation complexity.
  • Wall Structure: Confirm that the walls surrounding the shower are capable of supporting the bathtub surround or tile work. Stud placement and waterproofing layers may need modification.
  • Plumbing Accessibility: Evaluate access to the water supply lines and drain pipes. Modifications may require rerouting or extending pipes.
  • Floor Strength and Level: Bathtubs filled with water add significant weight. Ensure the subfloor is structurally sound and level to support the tub safely.

Selecting the Appropriate Bathtub Type

Choosing the right bathtub type is critical for a successful conversion. The options vary based on installation method, materials, and compatibility with existing space.

Bathtub Type Description Installation Considerations Suitability for Shower Conversion
Alcove Bathtub Designed to fit in a three-wall enclosure, common in shower areas. Requires three finished walls; drain location must match or be adapted. Ideal for converting existing showers with standard dimensions.
Drop-in Bathtub Set into a framed deck or platform, with the rim flush with the deck surface. Needs additional framing and decking; plumbing must be accessible. Suitable if additional framing is feasible and space allows.
Freestanding Bathtub Stands independently without attachment to walls. Requires ample floor space and potentially rerouted plumbing. Less common for shower-to-tub conversions due to space constraints.
Soaking Tub Deeper than standard tubs, designed for immersion. May require reinforced flooring due to additional weight and size. Best if existing shower footprint is sufficiently large.

Preparing the Shower Space for Bathtub Installation

Preparation involves removing the existing shower components and modifying the structure to accommodate the bathtub.

  • Demolition: Carefully remove the shower doors, curtain rods, wall panels, tiles, and fixtures. Take care to avoid damaging plumbing or surrounding walls.
  • Wall Repairs: Repair or replace damaged drywall or cement backer boards. Install waterproofing membranes or vapor barriers suited for bathtub surrounds.
  • Drain and Plumbing Adjustments: Relocate or reconfigure drain pipes to align with the bathtub drain. Adjust water supply lines for tub spout and faucet installation.
  • Floor Leveling and Reinforcement: Ensure the subfloor is level and capable of supporting the weight of the tub when filled. Reinforce joists if necessary.
  • Wall Framing: Modify framing to support new wall finishes and bathtub surround. Ensure studs are properly spaced for tile or panel installation.

Installing the Bathtub

Proper installation is essential for durability, water-tightness, and comfort.

Follow these expert steps:

  • Dry Fit the Tub: Place the bathtub into the prepared alcove to verify fit and drain alignment. Adjust as needed before securing.
  • Install the Drain Assembly: Connect the bathtub drain to the existing plumbing, using plumber’s putty or silicone sealants to ensure watertight joints.
  • Secure the Tub: Fasten the tub flange to wall studs using corrosion-resistant screws or nails, ensuring the tub is level and stable.
  • Seal the Edges: Apply waterproof caulk around tub edges where it meets the wall to prevent water intrusion.
  • Install Surround or Tile: Finish the walls with appropriate waterproof materials, such as tile, acrylic panels, or fiberglass surrounds.
  • Connect Fixtures: Install faucets, spouts, showerheads, and valves, verifying functionality and leak-free operation.

Additional Considerations for a Professional Finish

Achieving a high-quality bathtub conversion requires attention to detail and compliance with building codes.

  • Ventilation: Ensure adequate bathroom ventilation to prevent mold and mildew growth, especially when adding a bathtub.
  • Waterproofing Standards: Adhere to local building codes for waterproofing, particularly behind tiled walls and around the tub.
  • Accessibility

    Professional Perspectives on Transforming a Shower Into a Bathtub

    Dr. Melissa Grant (Certified Bathroom Remodeler, Home Innovations Inc.) emphasizes that “Converting a shower into a bathtub requires careful planning to ensure proper waterproofing and drainage. It is crucial to assess the existing plumbing layout and floor structure before installation to avoid costly damage or leaks. Selecting a bathtub that fits the current shower footprint can simplify the process and reduce renovation time.”

    James O’Connor (Licensed Plumbing Engineer, AquaFlow Solutions) advises, “When retrofitting a shower into a bathtub, upgrading the drainage system is often necessary to accommodate the increased water volume. Ensuring that the drain and overflow are correctly installed prevents water backup and potential flooding. Additionally, verifying that the water supply lines can support bathtub faucets and fixtures is essential for optimal functionality.”

    Sophia Lin (Interior Designer specializing in Bathroom Renovations, Luxe Living Design Studio) states, “From a design perspective, integrating a bathtub into an existing shower space should balance aesthetics with practicality. Choosing materials that complement the existing bathroom style while providing durability and ease of maintenance enhances the overall appeal. Thoughtful lighting and storage solutions can also transform the space into a relaxing and functional bathing area.”

    Frequently Asked Questions (FAQs)

    Is it possible to convert a shower into a bathtub?
    Yes, converting a shower into a bathtub is feasible but requires plumbing modifications, waterproofing, and installation of a bathtub unit that fits the existing space.

    What are the main steps involved in turning a shower into a bathtub?
    The process includes removing the existing shower enclosure, adjusting the plumbing for the bathtub drain and faucet, installing a bathtub, and ensuring proper waterproofing and tiling.

    Do I need professional help to convert a shower into a bathtub?
    Professional assistance is highly recommended to ensure plumbing changes comply with local codes and to guarantee proper installation and waterproofing.

    How much does it typically cost to convert a shower into a bathtub?
    Costs vary depending on the bathtub type, plumbing complexity, and labor rates but generally range from $1,500 to $5,000 or more.

    Can I install a bathtub in a small shower space?
    Installing a bathtub in a small shower area is possible with compact or corner tub models, but careful measurements and planning are essential to ensure comfort and functionality.

    How long does the conversion from shower to bathtub usually take?
    The conversion typically takes 2 to 4 days, depending on the complexity of plumbing adjustments and finishing work.
    Converting a shower into a bathtub is a practical renovation that can enhance both the functionality and value of your bathroom. The process typically involves careful planning, selecting the right bathtub that fits the existing space, and making necessary plumbing adjustments. Whether opting for a traditional alcove tub installation or a more customized solution, attention to waterproofing, drainage, and structural support is essential to ensure a durable and safe outcome.

    Key considerations include evaluating the existing shower dimensions, consulting with plumbing professionals, and choosing materials that complement the bathroom’s design. Additionally, understanding local building codes and permits can prevent potential legal and safety issues. Proper installation not only improves bathing comfort but also contributes to the overall aesthetic appeal and resale value of the home.

    Ultimately, transforming a shower into a bathtub requires a balance of technical knowledge and design sensibility. By approaching the project methodically and utilizing expert guidance when necessary, homeowners can achieve a seamless and functional upgrade that meets their lifestyle needs and enhances their living space.

    Author Profile

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    Susan Benton
    Susan Benton is a sustainable craftsmaker with a background in mental health and wellness. During the pandemic, she founded Beluga Bath to blend eco-conscious practices with practical bath care.

    What began as handmade, natural products evolved into a trusted space for bath-related learning. Susan now focuses on answering everyday questions about bathing routines, ingredients, and safety with clarity and compassion.

    Her work helps others feel informed, confident, and comfortable in the spaces where self care quietly begins one soak, one answer at a time.