How to: install campervan windows

When installing campervan windows, you can either pay a professional or you can give it a go yourself. We decided to take the plunge and cut a massive hole in the side of our van as the first ever job of our conversion!

Of all the jobs we had to do to the van, the first one happened to be one of the most daunting. Most professional van builders will use a nibbler or electric shears to cut sheet metal. However, we were keen to use the tools we already had to save money, so before we took the plunge, we watched a few YouTube videos to get a good idea of how to approach the install campervan windows without having quite the right tools.

Once we were confident we’d be able to do it ourselves, we ordered our windows from Van Demon. On their website you can buy a window that comes with a fixing kit, meaning you’ll receive all of the correct glue, trim, etc to do the job yourself.


Products & tools needed

  • Drill
  • Jigsaw
  • Van conversion window kit (inc. fixing kit)
  • Hammerite anti-rust paint

Drilling and cutting the holes

We started the process by drilling holes from the inside of the van using the seam as a guide to where the hole would need to be. This would mean that we would then be able to Jigsaw from the outside almost doing a ‘dot to dot’ with the drill holes, as it would be easier to cut from the outside due to the exterior panel being flatter, meaning the foot of the Jigsaw would have a smooth surface to run along.

drilling holes in the side of a van conversion in order to install windows

Once we’d done the drilling, we made a hole large enough to fit the blade of the Jigsaw through, and then masking taped around the area so that we wouldn’t scratch the paint which wouldn’t be covered by the window. It quickly became obvious that masking tape was a terrible idea when we had to spend around two hours (!!) slowly peeling tiny pieces off the van, and for the other three windows we used gaffer tape, which was fine. 

We also stuck a cardboard box below where we were cutting for the first window to avoid any sparks leaving a mark on the paint, but we decided it wasn’t worth it for the other three windows as we just washed the van after fitting the windows to avoid the flecks of metal marking the paintwork.

girl sticking masking tape to the side of a van conversion in order to install windows

Once we had taped, it was time to start cutting out the hole. This was slightly nerve wrecking (and very loud!), but once you commit it’s fine. It’s definitely worth wearing a pair of goggles and some gloves, as lots of very hot flecks of metal were flying about – Dale currently has a cut on his nose from one! It probably took around 20 minutes to totally cut out the first hole. 

To make it easier, once a large section had been cut and it started to get a bit wobbly, we used the blue inserts that came with the window kit (used to protect the window) to pad between the van and the cut part of the metal. This made it much easier to keep cutting. Once the cut part had almost been removed, Charlie went inside the van and attached two quick grips to the sheet of metal. As the last cut was made and the sheet fell, she was able to hold it with the quick grips.

man cutting a hole in the side of a Sprinter van conversion with a Jigsaw in order to install windows

Filing and painting the edges

Once the hole had been cut, as we had used a Jigsaw which left quite rough edges, we had to file these down to remove any high points. We also applied some Hammerite to the edges. Our van is galvanised so it may not have been necessary to do this, but we thought it was better to play it safe and reduce any risk of rusting.

Applying primer and glue to the van and windows

In the window kit from Van Demon, you receive a little pot of primer for the windows, and a tube of glue. You need to make sure to apply the primer to the window early on, so it has enough time to completely set before you push the window onto the van. 

The first time we used the primer, we applied it all around the window on the black ceramic edge, as the instructions tell you to. However, once the window was pushed into place, all of the set black primer was visible on the window inside the van. For the next windows, we made sure to apply the primer only to the outside edge of the windows, so that it would not be visible from inside the van.

As we were working on probably one of the coldest days of the year, surrounded by snow, it was pretty hard to get the glue warm enough to squeeze out of the tube. We ended up keeping it in our jackets to try and warm it up, but in the end we found leaving it in the windscreen of the van in the sun got it warmest.

Even so, it was extremely hard to squeeze out of the tube – a definite forearm workout! Dale ended up using a quick grip to squeeze the handle of the glue gun together, as this gave him more leverage and made it a bit easier to get the glue out. As there was quite a lot of glue in the tube, we ended up doing two thick beads around the hole, making sure it would line up with the primer on the windows when they were pressed on.

Installing the campervan windows

Once the glue was on the van and the primer had fully dried on the window, we slowly lifted up the window and pressed it into place on the van. Once it’s on, you have about a minute to get it fully into the position you want before the glue starts to set. We pushed it into position and then put some gaffer tape on to hold it in place (we didn’t get any photos of us pressing the window into place, but there’s a timelapse on our Instagram story highlight if you’re interested). You will need to wait 3 hours for the glue to fully set. 

Attaching the window trim

The only job left once you have the window in place is to put the trim along the inside of the window, covering up the sharp edge on the inside of the van. We had some glue sticking our panels together that we had to dig out before we could put the trim on, but this was pretty easy to do. 

Thanks for reading, if you have any questions feel free to drop us a message on here or via Instagram!  

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