How to Build a Walk-In Shower

Say goodbye to your dark, cramped shower stall

Bathroom with large shower and double vanity
Photo: hikesterson / iStock / Getty Images Plus / Getty Images
Bathroom with large shower and double vanity
Photo: hikesterson / iStock / Getty Images Plus / Getty Images

This project can be costly in more ways than one. Hire a pro to get the job done right the first time, avoid potential injury, and eliminate budget-breaking DIY mistakes.

SKILL LEVEL
Challenging
COMPLETION TIME
3 days
COST
$700–$6,500
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What you'll need:
TOOLS
  • Measuring tape
  • Screw gun
  • Level
  • Paintbrush
  • Tile saw
SUPPLIES
  • Shower pan
  • Fixtures
  • Drain assembly
  • Shower doors
  • Plumber’s putty

Walk-in showers are widespread in modern home designs because of their practicality and beauty. Unlike traditional enclosed shower stalls, walk-in showers create an open, roomy bathing experience. If you're considering upgrading your bathroom, these steps will help you build a walk-in shower.

Keep in mind that unless you have extensive renovation experience, we recommend hiring a local shower installer for this job. They’ll follow the steps below and pay attention to details to build you a functional and beautiful walk-in shower that you'll enjoy for years.

  1. Prep

    Walk-in shower with dual heads
    Photo: PC Photography / iStock / Getty Images Plus / Getty Images

    Work with your contractor to plan and design your walk-in shower. Consider the available space, plumbing requirements, and your desired aesthetic. Determine the ideal location, ensuring it fits seamlessly into the bathroom layout.

    Prepare the space by removing existing fixtures and ensuring your bathroom is clean and debris-free. Select your materials and tools, including tiles, waterproofing materials, shower fixtures, shower pan, drain assembly, fixtures, and glass partition.

  2. Install the Shower Pan

    The shower pan forms the foundation for the entire structure. Here's what to do:

    • Preparation: Ensure the subfloor is clean, level, and structurally sound, then measure and mark the center of the shower area.

    • Positioning: Place the shower pan in the desired location, using a level to ensure it aligns with the drain opening.

    • Connect drain assembly: Following the manufacturer's instructions, apply plumber's putty or silicone sealant to create a watertight seal around the drain flange and existing plumbing.

    • Secure the pan: Secure the shower pan once the drain is connected by screwing it into the subfloor or using adhesive to bond it securely.

    • Test fit: Before proceeding, perform a test fit to ensure the shower pan is securely installed and level to prevent any issues with drainage or leaks later on.

  3. Waterproof the Area

    Waterproofing is essential in building a walk-in shower to protect the underlying structure from water damage. You will need a liquid waterproof membrane and reinforcing tape, which is a sticky waterproof adhesive.

    • Seal joints and corners: Use reinforcing tape to strengthen joints, seams, and corners.

    • Apply the waterproofing membrane: Follow the manufacturer's instructions, using a paintbrush or roller to ensure complete coverage over the entire shower area, including walls, floors, and corners.

    • Allow drying time: Allow the waterproofing membrane to dry completely between coats before proceeding.

  4. Test for Leaks

    Testing the shower pan before installing tiles is essential to ensure the waterproofing work you did is effective.

    • Cover drain: Use a drain plug or waterproof tape to seal the shower drain and prevent water from escaping during the test.

    • Fill the shower pan: Fill the shower pan gradually with water to a level just below the threshold of the shower door or entryway. 

    • Monitor: Observe the area for any signs of leakage, paying close attention to the corners, seams, and joints.

    • Inspect walls and floors: After allowing the water to sit for some time, inspect the walls and floors surrounding the shower area for any signs of moisture or water damage.

    • Repeat if necessary: If you detect any leaks or areas of concern during the initial test, address the issues by adding more waterproofing materials and repeat the leak test until the waterproofing is effective. 

    • Dry the area: Once the leak test is complete and no issues are detected, drain the water from the shower pan and thoroughly dry the area before proceeding with tile installation. 

  5. Install Tiles

    The fun part is seeing your dream shower come to life with a beautiful, durable tiled surface. Consider hiring a local tile installer for a professional finish.

    • Plan the layout and cut tiles to size.

    • Mix and apply thin-set mortar: Follow the manufacturer's instructions to ensure thorough mixing and a smooth consistency. Use a notched trowel to apply an even layer of thin-set mortar to the shower area in small sections.

    • Install tiles and edging: Place tiles onto the thin-set mortar, pressing them firmly into place using tile spacers to maintain even spacing. Install tile edging along the edges of the shower area to create a clean and finished look.

    • Grouting: Once the mortar sets, remove the tile spacers, mix the grout according to the manufacturer's instructions, and then, using a grout float, apply it to the joints between tiles, pressing it into the gaps. Use a damp sponge to remove excess grout from the tile surface.

    • Seal grout: Allow the grout to dry completely before applying a grout sealer to protect against moisture and staining.

  6. Install Shower Fixtures

    After tiling, you are ready to install the fixtures.

    • Prepare mounting areas: Use a carbide-tipped masonry drill bit to create the pilot holes for the mounting hardware. Start with the smaller bit size to prevent cracking or chipping the tiles, then gradually increase to the appropriate size for the mounting screws or anchors.

    • Attach fixtures: Wrap the plumber's tape around the threaded connections of the shower fixtures to create a watertight seal and prevent leaks. Once the mounting hardware is in place, attach the shower fixtures to the brackets or plates, following the manufacturer's instructions to connect the fixtures securely.

    • Apply silicone sealant: Using a caulking gun, apply a small bead of silicone sealant around the base of each fixture to create a watertight seal and prevent moisture from seeping behind the tiles. 

    • Final inspection: Before testing the shower, allow the silicone sealant to cure completely according to the manufacturer's instructions. Turn on the water to test each shower fixture's functionality.

  7. Install Partial Glass Enclosure

    Installing a glass enclosure for a walk-in shower is optional, depending on whether your space is an open wet room.

    • Select the glass enclosure: Choose the type of glass enclosure that suits your preferences and fits the shower space—options include framed, semi-frameless, or frameless designs, each offering different aesthetic and functional benefits.

    • Install hardware: Depending on the chosen design, install U-channels or hinges along the walls and floor of the shower opening using a level.

    • Position the glass panels: Carefully position them into the installed U-channels or hinges, ensuring a snug fit and checking that the panels are level and aligned before securing them.

    • Secure the glass panels: Use silicone sealant and glass-to-glass clamps to secure the glass panels in place, remembering to apply the sealant along the edges where the glass meets the U-channels or hinges to create a watertight seal. The silicone sealant must dry and cure completely (for at least 24 hours) before you use the shower.

    • Seal joints and edges: Using a caulking gun, apply silicone sealant along the joints between the glass panels and where they meet the walls, floor, and door frame. 

    • Final adjustments and cleaning: Check for leaks or gaps and reapply the sealant if necessary. 

Mistakes to Avoid When Building a Walk-In Shower 

Interior of a sink with a shower
Photo: ADDICTIVE STOCK / Adobe Stock

Walk-in showers are a great way to increase the aesthetics and accessibility of your bathroom, but if you’re not careful, you can make a few mistakes that can lead to bigger problems later on. Here’s what to avoid when building a walk-in shower:

  • Not waterproofing properly: If the walk-in shower isn’t properly waterproofed, it will spell trouble down the road when water damage occurs in potentially difficult-to-reach places.

  • Not installing proper ventilation: Proper ventilation draws heat and moisture out of the bathroom, but not installing proper ventilation will allow moisture to stay in the room and eventually create issues with mold and mildew.

  • Not sloping the floor: A sloped floor or shower pan allows water to flow into the drain. If the floor isn’t sloped correctly, water will run where you don’t want it. 

  • Attempting to DIY it without the right experience: If you’re a skilled DIYer with plumbing experience, then this may be a good job for you. But if you’re a beginner, this is a job for the professionals. Anytime you’re dealing with plumbing and areas that have to be waterproofed, you need to make sure you do everything properly to avoid leaks later on. 

Safety Warning

Simple plumbing DIYs like unclogging a drain are perfect for homeowners, but taking on a major plumbing project has risks. An incorrect installation could lead to leaks and extensive damage to your home. With your safety and wallet in mind, consider hiring a licensed plumber to take on complex jobs.

How Much Does It Cost to Install a Walk-In Shower?

The cost of a walk-in shower installation ranges between $6,000 and $12,000 if you hire a pro. This large cost range results from the number of options you can choose for a walk-in shower. For example, a prefabricated fiberglass insert starts around $400, and you won’t have labor costs if you install it yourself. A fully customized walk-in shower costs around $4,200 on the low end but goes up to $12,000 or more, depending on the size and materials. 

DIY vs. Hiring a Pro 

If you have experience with plumbing, carpentry, and tiling, tackling the installation yourself could save money. However, installing a walk-in shower requires precise measurements, knowledge of building codes, and proficiency with specialized tools.

Hiring a shower installer or plumber in your area is the safer option. Professionals can ensure proper waterproofing, accurate tile installation, and adherence to safety standards, potentially preventing costly mistakes and future repairs.

Frequently Asked Questions

The most cost-effective method of building a shower involves using a prefabricated shower kit, which can be found at most home improvement stores. These kits include preformed shower bases, wall panels, and doors, reducing labor and material costs. You’ll most likely need to hire a local shower installer to make sure it’s installed properly, but it will be less expensive than designing and installing a custom shower. 

Doorless showers feature strategically placed showerheads, drains, and sloped floors to contain water. The sloped floor allows water to seamlessly flow toward the drain and prevents pooling. Proper design and waterproofing ensure that water is directed into the drain, minimizing the risk of it spreading out into the rest of the bathroom.

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