Replacing Caravan and Motorhome Windows: A UK Fitting Guide

Updated: 9 October 2026 · EuroVan Shop

When should you replace a caravan or motorhome window?

A window does more than let in light. It needs to close properly, keep water out and remain secure while you travel. If it no longer does those jobs, replacement may be more dependable than trying to live with the fault.

Look closely at the glazing and the moving parts. Fine surface marks can be cosmetic, but extensive crazing, cracks or damage around the edges are reasons to investigate a replacement. A crack can spread, while a damaged edge may make it harder for the window to sit evenly in its frame.

Leaks are another common warning sign. First check whether water is coming through the window seal or from another part of the wall above it. If the window seal has failed, or the frame is damaged and cannot be made watertight, replacing the window may be the right answer. Do not assume that applying more sealant over the outside will fix a poorly seated or damaged unit.

Broken or loose hinges can stop a window opening, holding its position or closing securely. If replacement hinges are not suitable or the surrounding window is also worn, a complete replacement can make more sense. Check the catches and the frame as well as the hinge: the fault may involve more than one component.

Before ordering, identify the window type and measure the opening. Caravan and motorhome windows are not automatically interchangeable just because their visible dimensions look similar. The cut-out, wall thickness, fixing arrangement and opening style all matter.

Which replacement window style should you choose?

Two common choices are push-out and sliding windows. A push-out window opens outwards on hinges, while a sliding window moves across its frame. Think about how you use the space, the available room outside and inside, and whether you need ventilation while parked. Also check that the chosen style suits the opening and surrounding bodywork.

Glazing and tint are worth comparing too. EuroVan’s range includes double-glazed acrylic options, as well as single-glazed and different tint choices. A replacement should suit your priorities for appearance, privacy and the existing opening, rather than being chosen by style name alone.

For a broad view of available sizes and styles, browse caravan windows. EuroVan also has campervan windows in push-out and sliding formats. Check the product details against your measurements before buying; similar-looking windows can have different cut-out sizes.

How do you measure a replacement window?

The most important measurement is the cut-out: the hole in the vehicle wall where the window sits. Measure the opening itself, width by height, in millimetres. Do not measure the visible outer frame of the old window. Its frame can overlap the wall opening, so using that outside measurement may lead you to order a window that is too large.

If the old window is still installed, the frame can hide the true cut-out. Where possible, remove it carefully to expose the opening and measure from edge to edge. If it has already been removed, check the full opening at more than one point and note whether the sides are square or irregular. Record the width and height clearly, and take a photo to show the shape and surrounding wall.

EuroVan lists window sizes as cut-out size, width by height, in millimetres. If your opening matches a listed size, the window is designed to fit that cut-out. If the opening is slightly smaller, it may be possible to enlarge it with a jigsaw, but take care to preserve a neat, suitable edge and avoid cutting beyond the required dimensions. If your measurements do not match a listed size, ask for help before ordering rather than guessing.

Wall thickness matters as well. EuroVan windows fit flat walls from 25 to 75 mm thick. Longer screws can extend the fitting range where needed, but confirm the right arrangement for your wall before installation. For a panel van conversion, the fitting guidance calls for a wooden batten frame with a minimum 25 mm section around the opening. A caravan or motorhome construction may differ, so inspect how the wall is built and ensure the fixing is appropriate.

Use the windows by cut-out size collection to compare openings with available options. If you are unsure, send EuroVan a photo and your cut-out measurements; the team can confirm the size within 24 hours. This is particularly useful if the old unit has an unusual shape or the measurement is close to a listed size.

How do you remove and fit a replacement window?

Allow time to work carefully and arrange a second person to help support the window. EuroVan estimates about one hour per window with two people, although the condition of the old seal, access and the vehicle construction can affect the job. If you are not confident cutting or sealing the bodywork, ask a converter to carry out the fitting. Converters quote labour separately, and prices vary by region and vehicle.

Before starting, check that the replacement matches the cut-out and wall thickness. Gather a jigsaw, drill/driver and suitable Sikaflex. The fitting requirements include one 300 ml tube of Sikaflex 265 per window, plus Sika Aktivator-205 or a Sikaflex Window Kit. Use the product instructions and the window’s step-by-step fitting guide for preparation and application.

To remove the old unit, support it so it cannot drop when released. Remove the interior trim and undo the existing fixings, keeping the window supported as you work. Once the fixing frame is free, ease the old window away from the wall without levering hard against the bodywork. Old sealant may hold it in place, so take your time and protect the surrounding surface. Clear away the old unit and inspect the cut-out and wall for damage before fitting anything new.

Make any necessary adjustment to the opening carefully. For a panel van, make sure the wooden batten frame around the cut-out is in place and provides the required support. Dry-fit the window and counter-frame first to check alignment, screw reach and the fit against the wall. This check can reveal a measurement or clearance problem before sealant is applied.

Prepare the surfaces and apply Sikaflex 265 in line with the fitting instructions. Position the window, fit the supplied aluminium counter-frame and tighten the screws evenly so the unit sits correctly. Avoid overtightening or pulling the frame out of shape. Clean up and finish the installation as directed by the sealant and window instructions, then allow the materials to set as specified before using the window. If you need the preparation products together, see the Sikaflex Window Kit.

After fitting, check that the window opens, closes and latches as intended. Inspect the seal and frame for an even fit. If anything sits unevenly or the wall thickness and screw arrangement do not seem right, stop and get advice rather than relying on extra sealant to compensate.

What does EuroVan include with its windows?

EuroVan’s range includes push-out and sliding designs, with different glazing and tint options. The right choice depends on your cut-out and the way you want the window to open. The campervan windows collection makes it possible to compare the options, while the caravan collection is useful when you are sourcing a replacement for a caravan or motorhome.

Every EuroVan window, except the VanLight window-only option, comes with the window, an aluminium counter-frame and screws, an interior frame with blackout blind and mosquito net, and a step-by-step fitting guide. The VanLight option with blind includes its blind; check the specific product listing to confirm exactly what is included with the option you select.

EuroVan windows are ECE R43 approved and come with a two-year warranty, with spare parts available for five years. Free technical help is available before and after purchase, with replies within 24 hours. For a replacement, send the team your vehicle model, cut-out width and height, wall thickness and a photo where possible. These details help establish whether the size and installation are suitable before you order.

Remember that a matching cut-out is only one part of choosing correctly. Confirm the wall is flat, check the thickness falls within the fitting range and make sure the style matches the opening. If you cannot verify those details from the old window alone, ask for confirmation first.

Frequently asked questions

Can I replace a caravan window with a campervan window?

Possibly, if the cut-out size, wall thickness, wall shape and fixing arrangement are compatible. Measure the hole in the wall and check the product specifications rather than relying on the vehicle type or the visible frame size.

Do I measure the old window frame or the opening?

Measure the cut-out in the wall, width by height in millimetres. The visible frame can overlap the opening, so its outside dimensions are not the cut-out size used to select a replacement.

What wall thickness do EuroVan windows fit?

EuroVan windows fit flat walls from 25 to 75 mm thick. Longer screws can extend the fitting range. Check the wall build-up and fitting instructions before ordering or installing.

Can I fit a replacement window myself?

Fitting is a job for someone comfortable using a jigsaw, drill/driver and Sikaflex. EuroVan estimates about one hour per window with two people, but the job can take longer depending on the old seal and vehicle construction. If you are unsure, use a professional converter.

What should I do if my measurements do not match a listed size?

Do not guess. Send EuroVan a photo and the cut-out measurements; the team can confirm the size within 24 hours. If the opening is slightly smaller than a suitable listed cut-out, it may be possible to enlarge it carefully with a jigsaw.