How to Install Multipanel Shower Panels: Step-by-Step

A practical, step-by-step guide to installing Multipanel shower panels, covering wall preparation, measuring, cutting, fixing, trims, and sealing for a watertight finish.

Fitting shower panels looks daunting until you break it down into stages. Multipanel systems have become popular with UK homeowners because they go up faster than tiling, need far less grout maintenance, and give a clean, waterproof finish that lasts for years. With a free weekend, a few basic tools, and some patience, installing Multipanel yourself is entirely realistic. This guide walks through the process from start to finish.

What You'll Need Before You Start

Before any panel goes near the wall, gather your tools and materials: a spirit level, tape measure, fine-tooth jigsaw or circular saw, silicone sealant gun, panel adhesive (Multipanel's own adhesive works best with their boards), a straight edge, and trims to suit your shower enclosure. Keep a pencil, masking tape, and a damp cloth handy for cleaning up excess adhesive as you go.

Before buying anything, it helps to understand what separates one system from another. If you're still deciding between materials, a PVC vs tile walls comparison explains why panel systems tend to outperform traditional tiling in wet areas over the long term.

Checking and Preparing the Wall

Multipanel systems are forgiving compared to tiling, but they still need a reasonably flat, dry, and stable surface underneath. Run a spirit level across the wall in several directions to check for dips or bulges. Imperfections under 3mm are fine and get absorbed by the adhesive, but anything beyond that should be filled and left to dry fully first.

If the existing wall is painted plaster, give it a light sand to help the adhesive key properly. Tiled walls can usually be panelled over directly, provided the tiles are sound, though it's worth pressing along the surface to check for hollow spots. Remove any skirting boards, sanitary ware, or fittings that would get in the way of a clean panel edge.

Measuring and Marking Out

Accuracy here saves a lot of grief later. Measure the height and width of each wall section, noting any obstructions such as taps, shower valves, or extractor housings. Multipanel boards come in standard widths, so plan your layout to minimise narrow offcuts, which are harder to fix securely and look untidy once installed.

Mark cutting lines onto the protective film covering the panel rather than the panel surface itself, keeping the decorative face scratch-free. For tap and shower valve cutouts, measure twice from two fixed reference points, such as the floor and the corner of the wall, to avoid a hole that's a centimetre out.

Cutting the Panels

A fine-tooth jigsaw blade gives the cleanest results, though a circular saw works well for long, straight cuts. Cut slowly and support the panel fully along its length to stop it flexing or cracking at the edges. For tap holes, drill a pilot hole first, then use a jigsaw or hole saw to open it out to size.

Dry-fit each panel before applying any adhesive. It's much easier to trim a fraction more off an edge than to stretch a panel that's been cut too short. Leave the protective film in place until the panel is fixed, so it protects the surface from scratches and adhesive smears during fitting.

Fixing the Panels to the Wall

Apply panel adhesive in a serpentine pattern across the back of the board, keeping it roughly 50mm from the edges. Press the panel firmly into place, starting from one edge and working across to push out any trapped air. Bed the panel evenly with a clean roller or the flat of your hand, checking with your spirit level as you go.

Work from a corner outward, and start with the panel behind the shower valve or tap fittings, since this is hardest to adjust once neighbouring panels are in place. Support the panel with masking tape or temporary props while the adhesive cures, particularly on taller sections where gravity can cause slippage.

If you're weighing up whether panels or a fully tiled acrylic-style finish suits your bathroom better, this acrylic wall panels comparison covers the practical differences in upkeep and appearance between the two options.

Fitting Trims and Corners

Trims aren't just decorative; they're what makes the system watertight. Internal corner trims, external corner trims, and end caps all need bedding in adhesive and pressing firmly against the panel edges. Cut trims to length with a fine-tooth saw and mitre corners where two trims meet for a neater finish. A trim that's loose or poorly seated is a common cause of leaks later, and it's far easier to correct now than after the adhesive has cured.

Sealing and Finishing

Once every panel and trim is fixed and the adhesive has cured according to the manufacturer's guidance, usually 24 hours, apply a continuous bead of sanitary silicone along all edges, joints, and where panels meet the shower tray or bath. Smooth the bead with a sealant tool or a wetted finger for a clean line.

Peel back the protective film only once sealing is complete and the silicone has skinned over. Removing the film too early exposes the panel surface to scratches and adhesive residue while you're still working around it.

Common Mistakes to Avoid

Rushing the wall preparation is the most frequent cause of problems later, since adhesive won't bond properly to a damp or uneven surface. Cutting panels too tight against fittings, skipping the dry-fit stage, and applying silicone before the adhesive has fully cured are also common issues that lead to gaps or movement.

Another mistake is choosing panels on price alone without comparing performance. A proper Multipanel comparison against standard PVC alternatives shows where the extra cost of a branded system pays off in durability and finish quality.

Design Considerations Before You Buy

Beyond the installation itself, it's worth thinking about how the finished panels will look in your bathroom. Multipanel ranges come in a wide variety of finishes, from stone and marble effects to plain gloss colours, and the right choice depends on room size and natural light. Lighter finishes open up smaller bathrooms, while darker or textured panels work well as a feature wall. For inspiration, a collection of Multipanel bathroom designs is a useful starting point before committing to a colour or texture.

Where This Fits Into Your Wider Bathroom Plan

If you haven't settled on a system yet, it's worth comparing your options properly before ordering materials. A thorough shower panel buying guide will help you weigh up thickness, finish, and warranty terms, all of which affect how the panels perform once fitted. It's also worth checking how different brands stack up on price and quality first. A roundup of top shower panel systems gives a good sense of what's currently available on the UK market.

Final Thoughts

Installing Multipanel shower panels is a manageable DIY project provided you prepare the wall properly, measure carefully, and give the adhesive and sealant time to cure at each stage. Working methodically, panel by panel, rather than rushing to finish in one go, is what separates a tidy, watertight installation from one that needs revisiting months later.

Once you're ready to order materials, buy from a supplier that stocks a full range of finishes and trims to match. If you're not sure where to buy shower panels, choosing a specialist retailer over a general DIY store usually means better stock availability and more accurate colour matching across your whole enclosure.

Published by Floor to Wall Guide.