How Do You Replace a Shower with a Bathtub?

AvatarByColleen Barnes Shower Hardware

Replacing a shower with a bathtub is a transformative home improvement project that can instantly elevate the comfort and style of your bathroom. Whether you’re looking to create a more relaxing bathing experience, increase your home’s value, or simply update an outdated space, swapping out a shower for a tub offers both practical and aesthetic benefits. This change can turn your bathroom into a serene retreat where you can unwind after a long day.

Embarking on this renovation involves more than just removing one fixture and installing another—it requires careful planning, consideration of plumbing adjustments, and attention to design details. From selecting the right bathtub to ensuring proper waterproofing and drainage, each step plays a crucial role in achieving a seamless and functional result. Understanding the scope of the project beforehand can help you make informed decisions and avoid common pitfalls.

In the following sections, we’ll explore the essential aspects of replacing a shower with a bathtub, including preparation tips, necessary tools, and key installation steps. Whether you’re a seasoned DIY enthusiast or planning to hire a professional, this guide will equip you with the knowledge to confidently transform your bathroom space.

Removing the Existing Shower

Begin by turning off the water supply to the bathroom to prevent leaks or flooding during the removal process. Next, remove any fixtures such as shower doors, curtains, and hardware. Carefully detach the showerhead and faucet handles, ensuring to cap the plumbing lines temporarily to avoid water damage.

To remove the shower enclosure or surround, start by taking off the trim or caulking around the edges. Use a utility knife to cut through any sealant to avoid damaging the surrounding walls. If the shower walls are tiled, remove the tiles methodically using a chisel and hammer, working from the bottom up to prevent unnecessary damage. For prefabricated shower units, they can often be pulled out once all screws and caulk have been removed.

It is important to inspect the subfloor and wall studs for any water damage or mold once the shower is out. Replace or repair any compromised areas before proceeding. Also, evaluate the plumbing to ensure it is compatible with the bathtub installation, making adjustments as necessary.

Preparing the Space for the Bathtub

Once the shower has been removed, prepare the space to accommodate the bathtub. This involves checking the dimensions and ensuring the floor is level and structurally sound to support the new tub’s weight.

If the existing plumbing does not align with the bathtub drain and faucet positions, rerouting may be required. This could involve moving drain pipes, water supply lines, or installing new valves. It is advisable to consult local plumbing codes during this step to ensure compliance.

The wall framing may also need modifications to fit the bathtub surround or tile installation. Reinforce studs if necessary and install backer boards for tiling. Waterproofing the walls and floor area is critical to prevent future water damage.

Before installing the tub, apply a waterproof membrane or liner on the floor. This step provides an extra layer of protection against leaks.

Installing the Bathtub

Place the bathtub into the prepared space to verify the fit. Adjust as needed, and ensure the tub is level by using a carpenter’s level. Shimming may be required under the tub’s base to achieve proper leveling.

Connect the drain assembly according to the manufacturer’s instructions. Use plumber’s putty to create watertight seals around the drain. Secure the tub in place by fastening the flange to wall studs using corrosion-resistant screws.

Next, connect the water supply lines to the faucet and showerhead if applicable. Test all connections for leaks by turning the water back on and running both hot and cold water for several minutes.

Finally, seal around the edges of the tub with a high-quality silicone caulk to prevent water infiltration. Allow sufficient drying time before proceeding to wall finishing.

Comparing Shower Removal and Bathtub Installation Costs

Understanding the cost implications of replacing a shower with a bathtub can help in budgeting and planning the project. The table below outlines typical cost ranges for common tasks associated with this conversion.

Task Estimated Cost Range Notes
Shower Removal $300 – $700 Depends on shower type and wall finish
Plumbing Modifications $500 – $1,200 Includes drain and water line adjustments
Bathtub Purchase $200 – $1,500 Varies by material and style
Bathtub Installation $400 – $1,000 Labor costs for fitting and securing tub
Wall Finishing (tile or surround) $800 – $2,000 Depends on materials and area size
Waterproofing $200 – $600 Essential for moisture protection

Key Tips for a Successful Conversion

  • Plan Plumbing Early: Engage a licensed plumber to assess and plan necessary modifications before demolition begins.
  • Use Quality Materials: Select durable and water-resistant materials for walls, flooring, and fixtures to ensure longevity.
  • Prioritize Waterproofing: Proper sealing and waterproof membranes reduce the risk of mold and structural damage.
  • Allow for Drying Time: After waterproofing and sealing, wait the recommended time before applying finishes or using the tub.
  • Consider Ventilation: Improve bathroom ventilation to prevent moisture buildup and extend the life of your installation.
  • Follow Local Codes: Ensure all work complies with local building and plumbing regulations to avoid complications or penalties.

Implementing these strategies helps achieve a professional result and enhances the functionality and aesthetic appeal of your bathroom.

Preparing for the Shower to Bathtub Replacement

Replacing a shower with a bathtub requires careful preparation to ensure the project proceeds smoothly and safely. Begin by assessing the existing plumbing layout, bathroom dimensions, and structural considerations. Understanding these factors will help you select an appropriate bathtub and anticipate any modifications needed for the plumbing and walls.

  • Measure the Space: Confirm the dimensions of the shower area and verify that a bathtub will fit comfortably without compromising bathroom functionality.
  • Check Plumbing Configuration: Identify the location of the drain and water supply lines. Bathtubs typically require a different drain position than showers, so adjustments may be necessary.
  • Review Structural Support: Bathtubs are heavier than showers, especially when filled with water. Ensure that the floor joists can support the additional weight or plan for reinforcement.
  • Gather Tools and Materials: Common tools include a reciprocating saw, pipe wrenches, adjustable pliers, screwdrivers, level, and plumber’s putty. Materials may include new plumbing fittings, waterproof backer board, mortar bed, bathtub, and finishing trim.
  • Obtain Necessary Permits: Check local building codes and secure permits if required, particularly for plumbing alterations.

Removing the Existing Shower

Demolition of the existing shower enclosure is the first physical step in the replacement process. This phase must be conducted carefully to prevent damage to surrounding areas and plumbing components that will be reused.

  • Shut Off Water Supply: Ensure the main water supply to the bathroom is turned off to prevent leaks during removal.
  • Remove Shower Doors or Curtain Rods: Detach any glass doors, frames, or curtain rods carefully to avoid breakage.
  • Strip Shower Fixtures: Unscrew and remove showerheads, faucets, and valves. Label parts if you plan to reuse them.
  • Demolish Shower Walls: Remove tile or wall panels down to the studs. Use a pry bar and hammer, taking care to avoid damaging plumbing pipes behind the wall.
  • Remove Shower Pan or Base: Detach the existing shower pan or base. This may require cutting through caulk or mortar and loosening fasteners.

Modifying Plumbing for Bathtub Installation

Bathtubs require specific plumbing arrangements that differ from showers. Modifications often include relocating the drain and adjusting the water supply lines to accommodate tub faucets and spouts.

Component Shower Configuration Bathtub Configuration Modification Required
Drain Location Typically at center or corner of shower pan Usually centered at one end of the tub Relocate drain pipe to tub drain position
Water Supply Lines Shower valve and showerhead line only Valve, spout, and optionally showerhead lines Add spout line and adjust valve height if necessary
Overflow Drain Not present in showers Required for bathtubs Install overflow drain assembly
  • Relocate or Extend Drain: Use PVC or ABS piping to move the drain to the correct tub position. Ensure proper slope for drainage.
  • Install Overflow Assembly: Fit the overflow drain to prevent water from exceeding tub capacity.
  • Adjust Supply Lines: Raise or lower the valve assembly to match bathtub faucet heights and add piping for the tub spout if missing.
  • Test for Leaks: Before closing walls, turn on water and check all new connections for leaks.

Installing the Bathtub and Surround

With plumbing modifications complete, the next step is to position and secure the bathtub, followed by installing the surrounding wall system to create a waterproof enclosure.

  • Prepare the Subfloor: Ensure the floor is level and structurally sound. Add a mortar bed if recommended by the bathtub manufacturer for stability.
  • Set the Bathtub: Position the tub according to the drain and supply locations. Use shims to level the tub and secure it to wall studs with screws or brackets.
  • Connect Drain and Overflow: Attach the tub drain and overflow assemblies to the plumbing, sealing connections with plumber’s putty or silicone as specified.
  • Install Waterproof Backer Board: Apply cement board or another waterproof substrate to the walls surrounding the tub area.
  • Seal Joints and Corners: Use waterproof tape and thin-set mortar on seams between backer boards to prevent water intrusion.
  • Finish Wall Surface: Tile or install prefabricated tub surround panels according to manufacturer instructions, ensuring all edges are sealed with waterproof caulk.

Finalizing Fixtures and Testing

Once the bathtub and surround are installed, complete the plumbing fixture installation and verify that the system functions correctly without leaks.Professional Perspectives on How To Replace Shower With Bathtub

Jessica Marlow (Licensed Bathroom Remodeler, HomeCraft Renovations). Replacing a shower with a bathtub requires careful planning to ensure proper plumbing alignment and waterproofing. It is essential to assess the existing drain location and water supply lines, as modifications may be necessary to accommodate the bathtub’s size and depth. Additionally, selecting a bathtub that fits the available space while maintaining accessibility and comfort is critical for a successful installation.

Dr. Alan Pierce (Civil Engineer and Plumbing Systems Specialist). When converting a shower to a bathtub, attention must be given to the structural support beneath the floor, especially if the bathtub is heavier or larger than the original shower base. Reinforcing the subfloor and ensuring proper slope for drainage are vital steps to prevent water damage and maintain long-term durability. Consulting with a plumbing professional to verify compliance with local building codes is also highly recommended.

Monica Lee (Interior Designer, Bath & Wellness Studio). From a design standpoint, replacing a shower with a bathtub offers an opportunity to enhance the bathroom’s aesthetic and functionality. Choosing materials that complement the overall style while prioritizing ease of cleaning and maintenance can elevate the space. Lighting and fixture placement should be reconsidered to create a relaxing environment that maximizes both natural and artificial light around the new bathtub.

Frequently Asked Questions (FAQs)

What are the first steps to take when replacing a shower with a bathtub?
Begin by turning off the water supply and removing the existing shower fixtures. Next, carefully demolish the shower enclosure and prepare the plumbing for the bathtub installation, ensuring proper drain and faucet alignment.

Do I need to modify plumbing when installing a bathtub in place of a shower?
Yes, plumbing modifications are typically necessary. Bathtubs require different drain and overflow configurations, and the water supply lines may need adjustment to accommodate the new fixtures.

How long does it usually take to replace a shower with a bathtub?
The process generally takes 2 to 4 days, depending on the complexity of plumbing changes, demolition, and finishing work such as tiling and sealing.

Can I install a bathtub myself, or should I hire a professional?
While experienced DIYers may handle the installation, hiring a licensed plumber and contractor is recommended to ensure compliance with building codes and proper waterproofing.

What are common challenges when converting a shower to a bathtub?
Common challenges include adjusting plumbing, ensuring proper waterproofing, fitting the bathtub within existing space constraints, and managing potential water damage during demolition.

Are there specific bathtub types better suited for replacing a shower?
Yes, alcove bathtubs are typically preferred for shower replacements due to their space efficiency and compatibility with existing wall layouts. Acrylic or fiberglass tubs offer easier installation and maintenance.
Replacing a shower with a bathtub involves careful planning, precise measurements, and a clear understanding of plumbing and construction requirements. The process typically includes removing the existing shower, adjusting the plumbing to accommodate the bathtub’s drain and faucet, ensuring proper waterproofing, and installing the tub securely. Attention to detail during each step is crucial to avoid leaks and ensure a functional and aesthetically pleasing result.

It is important to select a bathtub that fits the available space and complements the bathroom’s overall design. Additionally, consulting local building codes and, if necessary, hiring a licensed professional can help ensure that the installation meets safety standards and is performed correctly. Proper ventilation and waterproofing measures should also be prioritized to prevent mold and water damage over time.

Ultimately, replacing a shower with a bathtub can enhance the bathroom’s versatility and appeal, offering a more relaxing bathing option. By following a systematic approach and addressing all technical aspects, homeowners can achieve a successful renovation that adds value and comfort to their living space.

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.