How to Measure for Bathroom Wall Panels

Measuring for wall panels is about more than working out the bathroom's total wall area. You need to know which pieces will cover each wall, where the joins will sit and how the panels will finish around corners, windows and fittings.

A simple sketch and careful measurements will help you order the right quantities and avoid unnecessary extra joins. This guide covers planning before purchase; your fitter should confirm the final cutting dimensions against the instructions for the chosen panel system.

If you are still choosing a material or finish, start with our Bathroom Wall Panelling Guide. For a comparison with tiling, read Bathroom Wall Panels vs Tiles.

Start with a sketch of each wall

Use a tape measure, pencil and paper, and record every dimension in millimetres. Draw each wall as if you are looking straight at it, and label them Wall A, Wall B and so on. Include the area you actually want to cover: a shower enclosure, bath surround, feature wall or the full room.

Mark windows, doorways, niches, pipework and the positions of the shower controls. Show which edges meet another panelled wall and which will remain exposed. Photos are useful alongside the sketch, particularly where a wall steps out or has an awkward corner.

Measure width and height in several places

Measure the width near the top, middle and bottom of each wall. Measure the height at the left, centre and right, using the planned bottom and top of the panelling rather than automatically measuring floor to ceiling. For a shower wall, the lower junction may be at the tray; around a bath, it may be at the bath edge.

Record all the readings. Walls and ceilings are not always square, and one measurement can hide a taper or uneven edge. Your panel stock must be large enough for the piece required, while its final cut may need to follow the wall shape. Do not simply use the smallest reading as the cutting size for an entire uneven wall.

If tiling is being removed, the tray has not been fitted or the substrate is changing, treat early measurements as estimates. Confirm them once the relevant preparation and installation positions are settled.

Check the exact panel dimensions and coverage

Choose the panel range before finalising quantities. Check its height, width, thickness, edge type and whether the price is for a single sheet or a pack. Confirm the effective installed coverage, particularly for tongue-and-groove boards, rather than assuming every millimetre of the overall width adds to the wall coverage.

Allbits products come in different formats. For example, AquaGen White Marble is listed as a single 1200 × 2400mm panel. AquaGen Walnut Ridged comes as six narrower boards with a stated pack coverage of 1200 × 2400mm. The DuraPanel Black Marble Gloss listing offers 2420 × 1200mm square-edge or 2420 × 1185mm Duralock options. Check the selected variant and its fitting instructions before calculating the order.

Work out quantities wall by wall

For a straightforward rectangular wall covered by vertical, full-height panels, divide its width by the confirmed effective panel width and round up. First check that the panel height is sufficient. Then draw the individual pieces to see where joins and offcuts will fall.

Planning example: Assume two walls are each 900mm wide and 2300mm high. The chosen sheet has a confirmed usable width of 1200mm and enough height for each wall. Each wall needs one 900mm-wide piece, so the initial plan needs two sheets. The 300mm-wide offcut from one sheet cannot cover the second wall as a single piece.

This is an illustrative layout, not a cutting schedule. The fitter must account for profiles, edge details and the manufacturer's required allowances. On a wider wall, consider where you want the join rather than automatically placing a narrow leftover strip at one end.

Plan windows and other openings

Measure an opening's width and height, plus its position from a fixed corner and the planned bottom edge. If the panel will continue into the window reveal, measure the sides, head and sill separately: their depth and finish affect the pieces and trims needed.

Do not deduct the opening's area automatically when ordering. You may still need a full sheet to cut around it, and its offcut may not be usable elsewhere. Record pipe and valve positions for planning, but recheck all cut-outs against the actual fittings before cutting.

Allow for joins and pattern direction

Marble veining, tile effects and ridged designs have a visual direction. Check whether adjoining panels have a matching sequence, whether a cut edge can join another board and whether an offcut can be reused without turning the pattern the wrong way. Do not assume a panel can be fitted horizontally; confirm the orientation allowed for the specific product.

Ask your fitter to work out cutting waste from the layout. A blanket percentage is less useful than a plan showing the pieces required, especially with large sheets or matching patterns.

Count the finishing profiles

Add the corner and edge details to your sketch:

• Internal corners: where two walls meet inward.
• External corners: where a wall projects outward, such as a boxed-in section.
• Exposed ends: where panelling stops against another finish.
• Straight joins: where the chosen system requires a joining profile.

Measure each run and check the available profile length. Match the profiles to the exact range and thickness; for example, AquaGen wall panel profiles are designed for AquaGen panels. Include approved adhesive and sealant in the order as specified by the installation guide.

Panel thickness, adhesive and profiles also affect the finished wall position. Let the fitter check clearance around enclosure frames, taps and other fittings before ordering or setting final positions.

Leave the fitting allowances to the chosen system

Panels may need expansion gaps and specific clearances at corners, the ceiling, the tray or bath and around penetrations. These vary by material and system. Do not subtract a standard gap from every measurement or assume a tight fit will be watertight. Record the wall dimensions first, then have the fitter apply the correct allowances and sealing details from the manufacturer's instructions.

Frequently asked questions

Can I order panels using the total wall area alone

Use area as a rough estimate, then plan the pieces for each wall. Sheet sizes, wall height, joins and cutting waste determine whether that area can actually be covered.

Should I subtract windows and doors

Not automatically. You may need a full panel to cut around an opening, and reveals can require additional pieces. Check the cutting layout before reducing the order.

Can I reuse every offcut

Only if its size, pattern direction and remaining edges suit another part of the installation. A piece with its joining edge cut off may not connect as intended.

Should I measure before the shower tray is installed

You can prepare an initial plan, but confirm final dimensions once the tray position and wall preparation are established. Measure from the actual junction specified by the panel system.

Your measuring checklist

1. Sketch and label every wall you want to cover.
2. Record width and height at several points in millimetres.
3. Mark openings, reveals, pipework and changes in wall shape.
4. Confirm the chosen panel's effective coverage and pack quantity.
5. Draw the pieces and joins, allowing for pattern direction and waste.
6. List compatible profiles, adhesive and sealant.
7. Have the fitter confirm quantities and final dimensions before ordering and cutting.

Browse Allbits Wall Panelling to compare formats and finishes. If you would like help with the order, contact Allbits with your labelled sketch, measurements and photos of the space.

For further tips Browse our Guides:

• Bathroom Wall Panelling: A Simple Guide to Choosing Shower Panels

• Bathroom Wall Panels vs Tiles: Which Should You Choose