How Do You Replace a Bathtub Shower Combo Step by Step?

AvatarByColleen Barnes Shower Hardware

Replacing a bathtub shower combo can transform the look and functionality of your bathroom, offering a fresh, updated space that meets your needs and style preferences. Whether you’re tackling this project to fix damage, upgrade outdated fixtures, or simply enhance your home’s value, understanding the process is essential to achieving a successful outcome. This task, while manageable for those with some DIY experience, requires careful planning and attention to detail to ensure a seamless installation and long-lasting results.

At first glance, replacing a bathtub shower combo might seem straightforward, but it involves multiple steps that range from demolition to plumbing adjustments and precise fitting. Each phase plays a critical role in guaranteeing that your new setup is both attractive and fully functional. Additionally, selecting the right materials and tools can make a significant difference in the ease of installation and the durability of your new bathtub and shower.

Before diving into the specifics, it’s important to consider factors such as bathroom layout, plumbing compatibility, and design preferences. With the right preparation and knowledge, you can confidently approach this home improvement project and enjoy the satisfaction of a beautifully renovated bathroom. The following sections will guide you through the essentials, helping you replace your bathtub shower combo with skill and confidence.

Removing the Existing Bathtub and Shower Components

Begin by turning off the water supply to the bathroom to prevent any accidental leaks or water damage. Next, remove the fixtures such as the faucet, showerhead, and handles. Use the appropriate tools—typically a wrench or screwdriver—to carefully detach these components without damaging the plumbing.

Once the fixtures are removed, proceed to detach the shower surround or tiles around the bathtub. If the surround is made of fiberglass or acrylic, gently pry it away from the wall using a putty knife or pry bar. For tile surrounds, carefully remove the grout around the tiles and then the tiles themselves to avoid damaging the drywall beneath.

Disconnect the drain and overflow assembly by loosening the slip nuts under the tub. This step often requires a basin wrench or channel locks due to tight spaces. After disconnecting the drain, inspect the plumbing for any signs of corrosion or damage, and address these issues before installing the new tub.

The bathtub itself can then be removed. If it’s a heavy cast iron tub, enlist help or rent equipment designed for heavy lifting. For lighter acrylic or fiberglass tubs, carefully lift and maneuver the unit out of the enclosure. Be cautious of sharp edges or rough surfaces that could cause injury.

Preparing the Space for Installation

Once the old bathtub and surround are removed, thoroughly clean the area to remove debris, old adhesive, and remnants of caulk. Check the wall studs and floor framing for any signs of water damage or rot, and repair as necessary. Reinforce the framing if needed to support the weight of the new bathtub shower combo.

Verify that the plumbing rough-ins are in the correct positions for the new unit. This includes the drain location and water supply lines. Adjust the plumbing if necessary to align with the specifications of the replacement tub.

Before installing the new tub, lay down a waterproof membrane or moisture barrier on the floor and walls to prevent future water damage. This is especially important in areas prone to moisture exposure.

Use a level to ensure the floor is flat and even. Uneven flooring can cause problems with the installation and result in poor drainage or tub instability.

Installing the New Bathtub Shower Combo

Carefully position the new bathtub into the enclosure, aligning it with the drain and water supply lines. It is important to have at least one other person assist with this step to avoid damage or injury.

Once in place, secure the bathtub to the wall studs with screws or nails through the flanges. Check the manufacturer’s instructions for specific fastening requirements. Use shims as necessary to ensure the tub is level and properly supported.

Connect the drain assembly and attach the overflow plate. Use plumber’s putty or silicone caulk around the drain flange to create a watertight seal. Tighten all connections securely but avoid over-tightening, which can crack fittings.

Next, install the shower valve and faucet components, reconnecting the water supply lines. Test the connections for leaks before proceeding further.

Apply a bead of silicone caulk along the perimeter of the tub where it meets the walls and floor. Smooth the caulk with a wet finger or caulk tool to ensure a clean, waterproof seal.

Finishing Touches and Testing

Install the shower surround panels or tile backer board according to the product specifications. For tile installations, apply a suitable waterproof membrane and use appropriate thin-set mortar. Ensure all seams and corners are sealed with waterproof tape or caulk.

Install the shower fixtures such as the faucet handles, spout, and showerhead. Verify that all fixtures operate correctly and that there are no leaks.

After installation, turn on the water supply and test the bathtub and shower for proper drainage and water flow. Check all connections for leaks over the next 24 hours, re-tightening or resealing as necessary.

Comparison of Common Bathtub Shower Combo Materials

Material Durability Maintenance Cost Installation Complexity
Acrylic Moderate Easy to clean; prone to scratching Moderate Relatively simple
Fiberglass Moderate to Low Requires gentle cleaning; can fade Low to Moderate Simple
Cast Iron Very High Requires enamel care; very durable High Complex; heavy
Steel High Moderate; prone to chipping Moderate Moderate

Assessing the Existing Bathtub Shower Combo

Begin by thoroughly inspecting the current bathtub shower combo to identify the scope of work and any potential challenges. This assessment helps determine necessary tools, materials, and whether additional plumbing or structural modifications are required.

  • Check for Damage: Look for cracks, chips, mold, mildew, or water damage around the tub and shower walls.
  • Measure Dimensions: Accurately measure the length, width, and depth of the existing bathtub as well as the height of the shower enclosure.
  • Inspect Plumbing Connections: Verify the location and condition of water supply lines, drain pipes, and shower fixtures.
  • Evaluate Wall Material: Identify the type of wall substrate (tile, drywall, cement board) surrounding the tub for demolition planning.
  • Verify Structural Support: Ensure the floor and framing can support the weight of the new tub, especially if upgrading to a heavier model.
Assessment Area Key Considerations Tools Required
Damage Inspection Look for cracks, leaks, mold, rust on fixtures Flashlight, moisture meter
Measurement Length, width, depth of tub and height of walls Tape measure, level
Plumbing Check Location of supply lines and drains, fixture types Pipe wrench, adjustable wrench
Wall Material Identification Tile type, drywall, or cement board presence Utility knife, pry bar
Structural Support Floor joist spacing, subfloor condition Inspection mirror, pry bar

Preparing the Work Area and Gathering Materials

Proper preparation is crucial for a safe and efficient replacement process. This phase involves protecting the bathroom, securing necessary permits if applicable, and assembling all required materials and tools.

Start by turning off the water supply to the bathroom and disconnecting any electrical fixtures near the tub area. Remove shower curtains, accessories, and any loose items. Lay down protective coverings on the floor and adjacent fixtures to prevent damage during demolition.

  • Materials Needed: New bathtub shower combo unit, plumbing fittings, waterproof membrane or backer board, sealants, screws, nails, and trim pieces.
  • Tools Required: Reciprocating saw, pry bar, hammer, screwdrivers, pipe wrenches, adjustable wrench, drill, level, measuring tape, caulking gun, safety gear (gloves, goggles, dust mask).
  • Permits and Codes: Check local building codes to determine if a permit is required for plumbing or structural work.
  • Workspace Setup: Ensure adequate lighting and ventilation. Organize tools and materials within easy reach.
Category Examples Purpose
Protective Materials Drop cloths, painter’s tape, plastic sheeting Prevent damage and contain debris
Demolition Tools Reciprocating saw, pry bar, hammer Remove old tub and wall coverings
Installation Tools Drill, level, caulking gun Secure new tub, ensure proper alignment and sealing
Plumbing Tools Pipe wrench, adjustable wrench, plumber’s tape Disconnect and reconnect water lines and drains

Demolishing the Existing Bathtub and Surround

Safe and thorough demolition is essential to avoid damaging plumbing or structural components. Follow these steps carefully:

Step 1: Remove Fixtures and Accessories
Remove the faucet handles, spout, showerhead, and any grab bars. Use an adjustable wrench or screwdriver as appropriate.

Step 2: Disconnect Plumbing
Shut off the water supply, then disconnect the water lines from the tub spout and faucet assembly. Cap off supply lines temporarily if needed.

Step 3: Remove Surrounding Wall Materials
Use a utility knife to cut through caulk and grout lines around

Professional Insights on How To Replace A Bathtub Shower Combo

Laura Mitchell (Certified Plumbing Contractor, HomeFlow Solutions). Replacing a bathtub shower combo requires careful planning, especially regarding water supply lines and drainage. It is essential to shut off the water supply before beginning any demolition to avoid leaks. Additionally, ensuring the new unit fits the existing space and aligns with current plumbing connections will minimize costly modifications. Proper sealing around the tub edges is critical to prevent water damage and mold growth.

James Carter (Licensed General Contractor, Carter Renovations). When replacing a bathtub shower combo, attention to structural integrity is paramount. Inspect the subfloor and surrounding framing for any signs of water damage or rot before installation. Upgrading to a fiberglass or acrylic unit can expedite installation and provide long-term durability. Furthermore, installing a waterproof membrane behind the walls enhances moisture protection, which is often overlooked but vital for longevity.

Dr. Emily Chen (Interior Design Specialist, Bath & Spa Innovations). From a design perspective, replacing a bathtub shower combo offers an opportunity to improve both functionality and aesthetics. Selecting fixtures that complement the overall bathroom style while considering ergonomics can enhance user experience. Incorporating modern features such as slip-resistant surfaces and adjustable showerheads increases safety and comfort. Proper lighting and ventilation should also be addressed during the replacement process to create a well-rounded bathroom environment.

Frequently Asked Questions (FAQs)

What tools are necessary to replace a bathtub shower combo?
Essential tools include a pry bar, adjustable wrench, screwdriver set, utility knife, caulking gun, level, and plumbing tools such as pipe wrenches and Teflon tape. Safety gear like gloves and goggles is also recommended.

How long does it typically take to replace a bathtub shower combo?
The replacement process generally takes 1 to 3 days, depending on the complexity of plumbing adjustments, removal of the old unit, and installation of the new combo.

Do I need to hire a professional plumber for this replacement?
Hiring a professional plumber is advisable if you lack experience with plumbing or if significant modifications to water lines and drainage are required. Proper installation ensures safety and code compliance.

What are the common challenges when replacing a bathtub shower combo?
Common challenges include removing the old unit without damaging surrounding walls, ensuring proper waterproofing, aligning plumbing fixtures correctly, and sealing to prevent leaks.

Can I replace just the bathtub or shower portion instead of the entire combo?
Replacing only one component is possible but may require custom fitting and adjustments. It is often more efficient and cost-effective to replace the entire combo to ensure compatibility and uniform appearance.

What materials are recommended for a durable bathtub shower combo replacement?
Materials such as acrylic, fiberglass, or enameled steel are recommended for durability, ease of maintenance, and resistance to mold and mildew in bathtub shower combos.
Replacing a bathtub shower combo involves careful planning, precise measurements, and a methodical approach to demolition and installation. The process typically begins with shutting off water supply lines and removing existing fixtures, followed by detaching the old tub and shower surround. Proper preparation of the plumbing and wall framing is essential to ensure a secure and watertight installation of the new unit. Attention to detail during sealing and finishing will prevent future water damage and enhance the overall durability of the replacement.

Choosing the right materials and components tailored to your bathroom’s layout and style is crucial for a successful replacement. Whether opting for a one-piece acrylic unit or a custom tile surround, compatibility with existing plumbing and adherence to local building codes must be considered. Additionally, professional-grade tools and safety precautions should be employed throughout the project to maintain structural integrity and personal safety.

Ultimately, replacing a bathtub shower combo can significantly improve bathroom functionality and aesthetics when executed correctly. Understanding the step-by-step process and potential challenges helps homeowners or contractors avoid common pitfalls. Engaging experienced professionals or thoroughly researching each phase can lead to a seamless renovation that adds value and comfort to the home.

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.