
Replacing a bath with a shower tray is a practical and space-saving renovation that can modernize your bathroom while enhancing accessibility and efficiency. This project involves removing the existing bathtub, ensuring proper plumbing adjustments, and installing a shower tray that fits seamlessly into the space. Key steps include measuring the area accurately, selecting a suitable tray material and size, and preparing the floor to support the new fixture. Additionally, updating the shower valve, drain, and waterproofing the surrounding area are crucial to prevent leaks and ensure longevity. With careful planning and attention to detail, this transformation can create a sleek, functional shower space tailored to your needs.
| Characteristics | Values |
|---|---|
| Project Difficulty | Moderate to Difficult (requires plumbing, tiling, and carpentry skills) |
| Time Required | 2-3 days (depending on experience and complexity) |
| Tools Needed | Wrenches, screwdrivers, utility knife, drill, saw, measuring tape, level, silicone sealant gun, safety gear |
| Materials Needed | Shower tray, shower enclosure (optional), shower mixer valve, waste kit, tiles/wall panels, adhesive, grout, silicone sealant, plumbing pipes/fittings |
| Cost Estimate | £500 - £2,000+ (depending on materials and labor) |
| Key Steps | 1. Turn off water supply 2. Remove bath and old plumbing 3. Prepare floor and walls 4. Install waste kit and shower tray 5. Fit shower enclosure/walls 6. Install shower mixer valve 7. Tile or panel walls 8. Seal edges with silicone 9. Test for leaks and functionality |
| Common Challenges | - Ensuring proper drainage gradient - Matching existing tiling/decor - Dealing with hidden pipework - Achieving watertight seals |
| Permits Required | Check local building regulations (often required for plumbing alterations) |
| Professional Help | Recommended for complex installations or lack of DIY experience |
| Maintenance Tips | Regularly clean shower tray and seals to prevent mold and leaks |
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What You'll Learn
- Measurements and Planning: Accurately measure bath space for shower tray fit
- Removing the Old Bath: Safely dismantle and remove the existing bathtub
- Preparing the Base: Ensure level, waterproof base for shower tray installation
- Installing the Tray: Securely fit the shower tray and seal edges
- Plumbing Adjustments: Modify pipes and drains to accommodate shower setup

Measurements and Planning: Accurately measure bath space for shower tray fit
Accurate measurements are the cornerstone of a successful bath-to-shower conversion. Before you fall in love with a sleek, modern shower tray, you need to know if it will actually fit. Grab a tape measure, a notepad, and a clear head – precision is key.
Start by measuring the length and width of your existing bath. Don’t just eyeball it; measure at multiple points to account for any irregularities in the walls or floor. Note down the smallest dimensions to ensure your shower tray fits comfortably without requiring major structural adjustments.
Next, consider the height. Measure from the floor to the top of the bath’s rim. This will help you determine the tray’s thickness and whether you’ll need to adjust the plumbing or flooring to achieve a level installation. If your bathroom has a sloping floor, measure the gradient and plan accordingly – a self-levelling compound might be necessary to create a stable base.
Now, think about the shower’s functionality. Measure the distance from the bath’s edge to any obstructions like windows, doors, or radiators. This will dictate the size and shape of the tray you can install. For example, a rectangular tray might work in a spacious bathroom, but a quadrant or offset quadrant tray could be a better fit for tighter spaces.
Finally, don’t forget the drainage. Locate your existing waste pipe and measure its position relative to the bath’s center. Shower trays have specific waste hole locations, so ensure compatibility to avoid costly plumbing reroutes. If the waste pipe is off-center, consider a tray with a flexible waste outlet or consult a plumber for solutions.
By taking these measurements and planning meticulously, you’ll avoid common pitfalls like ill-fitting trays, uneven installations, or plumbing disasters. This upfront effort will save you time, money, and frustration, ensuring your new shower not only looks great but functions flawlessly.
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Removing the Old Bath: Safely dismantle and remove the existing bathtub
The first step in transforming your bathroom from a bath to a shower tray is removing the old bathtub, a task that demands precision and caution. Begin by turning off the water supply to the bathroom to avoid any accidental spills or leaks during the process. Locate the shut-off valves under the bath or near the water heater and turn them clockwise until they are fully closed. If your bath has an overflow drain, remove the cover and use a suitable tool to unscrew the mechanism, ensuring you don't damage the surrounding tiles or sealant.
Disassembly Process: Start by cutting through the caulk around the bath's edges using a utility knife or a specialized caulk removal tool. This step is crucial for accessing the fixings and preventing damage to the surrounding walls. Once the caulk is removed, locate the screws or bolts securing the bath to the wall and floor. These are typically found under the bath panels or along the edges. Use the appropriate screwdriver or wrench to remove them, keeping track of the hardware for potential reuse or as a reference for new installations.
For older baths, especially those made of cast iron, consider the weight and size when planning the removal. You may need an extra pair of hands to lift and maneuver the bath safely. Place old towels or blankets around the work area to protect the floor and provide a soft landing for the bath. If the bath is particularly heavy, consider using a furniture dolly or straps to assist in the lifting process, ensuring you maintain a firm grip and proper posture to avoid injuries.
Cautionary Measures: Be mindful of potential hazards during this process. Asbestos was commonly used in older bath installations, particularly in the form of insulation around pipes. If your home was built before the 1980s, it's advisable to have a professional inspect for asbestos before starting any work. Additionally, lead pipes were once standard, so take precautions to avoid lead exposure, especially if cutting or disturbing old plumbing. Wear protective gear, including gloves, goggles, and a mask, to safeguard against dust, debris, and potential contaminants.
Final Removal: With all fixings removed, carefully lift the bath, ensuring it is fully detached from any remaining seals or adhesives. Have your assistant(s) ready to support the weight and guide the bath out of the bathroom. If the bath is in good condition and you plan to reuse or sell it, take extra care not to scratch or damage the surface during removal. Once the bath is out, inspect the area for any remaining debris or old sealant, and clean the space thoroughly before proceeding with the shower tray installation. This ensures a fresh start and helps identify any necessary repairs to the subfloor or walls.
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Preparing the Base: Ensure level, waterproof base for shower tray installation
A level and waterproof base is the cornerstone of a successful shower tray installation. Without it, you risk leaks, structural damage, and a wobbly, unsafe shower. Think of it as the foundation of a house – if it's not solid, everything built on top will suffer.
Before you even think about laying your shower tray, you need to assess your existing floor. Is it concrete, wooden joists, or a pre-existing base? Each material requires a slightly different approach. Concrete floors are generally the easiest to work with, as they provide a solid, level surface. Wooden joists, however, need to be reinforced and leveled to support the weight of the tray and water.
Leveling the Playing Field:
Achieving a perfectly level base is crucial. Even a slight tilt can cause water to pool in one corner, leading to stagnant water and potential mold growth. Use a spirit level to check the floor's evenness. For minor adjustments, self-leveling compounds are your best friend. These pourable mixtures find their own level, filling in low spots and creating a smooth, even surface. Follow the manufacturer's instructions carefully, paying attention to mixing ratios and drying times. For more significant leveling issues, you might need to build up the floor with plywood or cement board, ensuring a sturdy and level foundation.
Remember, a level base isn't just about aesthetics; it's about functionality and safety. A properly leveled shower tray drains efficiently, preventing water buildup and potential slips and falls.
Waterproofing: Your First Line of Defense:
Waterproofing is non-negotiable. Shower trays, by their very nature, are exposed to constant moisture. Without proper waterproofing, water can seep through cracks and gaps, causing rot, mold, and structural damage.
There are various waterproofing methods available, each with its own advantages. Liquid waterproofing membranes are popular due to their ease of application and ability to conform to uneven surfaces. These membranes are typically painted or rolled onto the floor and walls, creating a seamless, waterproof barrier.
Another option is sheet membranes, which are pre-formed sheets of waterproof material that are adhered to the floor and walls. While more labor-intensive to install, they offer excellent protection and durability.
Regardless of the method chosen, ensure that all seams and corners are properly sealed. Pay particular attention to areas around drains and pipes, as these are common entry points for water.
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Installing the Tray: Securely fit the shower tray and seal edges
The shower tray is the foundation of your new walk-in shower, so its installation demands precision and care. A poorly fitted tray can lead to leaks, structural damage, and a shortened lifespan.
Before you begin, ensure the subfloor is level and structurally sound. Any dips or slopes will cause water pooling and potential leaks. Use a spirit level to check and shim the area if necessary.
Positioning and Securing the Tray:
Place the tray in the desired location, ensuring it aligns perfectly with the drain and any surrounding walls. Most trays come with adjustable feet, allowing for fine-tuning of height and level. Tighten these feet securely, but be careful not to overtighten, as this can crack the tray. For added stability, consider using a bead of silicone sealant between the tray and the floor, especially if the subfloor is uneven.
Once the tray is level and secure, it's crucial to create a watertight seal around its edges. This prevents water from seeping underneath, causing damage to the subfloor and potentially leading to mold growth.
Sealing the Edges:
Apply a generous bead of high-quality, waterproof silicone sealant around the entire perimeter of the tray, where it meets the walls and floor. Use a caulking gun for precise application and a damp cloth to smooth the sealant, creating a neat and professional finish. Pay particular attention to corners and joints, ensuring complete coverage. Allow the sealant to cure fully according to the manufacturer's instructions before using the shower.
This seemingly simple step is vital for the longevity of your shower installation. A properly sealed tray will prevent leaks, protect your home from water damage, and ensure a safe and enjoyable showering experience for years to come.
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Plumbing Adjustments: Modify pipes and drains to accommodate shower setup
Replacing a bath with a shower tray often requires significant plumbing adjustments to ensure proper drainage and water supply. The first step is to assess the existing pipe layout. Bathtubs typically have a 1.5-inch drain pipe, while shower trays usually require a 2-inch pipe to handle higher water flow rates. Measure the distance from the existing drain to the main stack and determine if the pipe can be upsized or rerouted. If the main stack is too far, consider installing a shower pump to increase water pressure and ensure efficient drainage.
Once the drain size is addressed, focus on the water supply lines. Showers generally require both hot and cold water lines, which should be 1/2-inch in diameter for adequate flow. If your existing setup only has a single line (common in older homes), you’ll need to run an additional line from the water heater or manifold. Use PEX piping for flexibility and ease of installation, especially in tight spaces. Ensure the lines are properly secured and insulated to prevent leaks or heat loss.
Modifying the drain is a critical step that demands precision. If the shower tray’s drain hole doesn’t align with the existing pipe, you’ll need to relocate the drain. This involves cutting into the subfloor and repositioning the P-trap to match the new layout. Use a wax ring or rubber gasket to seal the connection between the drain and the shower tray, preventing leaks. Test the drain by pouring water into the tray to ensure it flows freely without pooling.
Finally, consider the slope of the drain pipe. A proper slope of 1/4 inch per foot is essential for gravity-fed drainage. If the existing pipe doesn’t meet this requirement, you may need to adjust its angle or install a new section. Use a level to verify the slope during installation. Neglecting this step can lead to standing water, clogs, and long-term plumbing issues. With careful planning and execution, these plumbing adjustments will ensure a seamless transition from bath to shower tray.
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Frequently asked questions
First, remove the existing bath, then assess and adjust plumbing as needed. Install a shower tray, ensuring it’s level and sealed properly. Connect the waste and water supply, and finally, tile or panel the walls for a finished look.
While DIY is possible, hiring a professional plumber or bathroom fitter is recommended to ensure proper installation, especially for plumbing and waterproofing.
Costs vary depending on the shower tray, materials, and labor, but typically range from $1,000 to $5,000, including installation and finishing.
Often, existing plumbing can be reused, but adjustments may be needed for the shower tray’s waste and water connections. A professional can assess this during installation.
Low-profile or flat-top shower trays are popular as they are easy to install and provide a sleek, modern look. Choose one that fits the space and complements your bathroom design.











































