Whether you are fitting out your first campervan or running a specialist conversion business, getting the glass right is one of the most important steps in any vehicle project. Order the wrong unit and you could be facing delays, refits, and unnecessary costs.

Here are five things worth knowing before you place your order.

1. E Marking Is Not Optional

All glass fitted to road-going vehicles in the UK must carry an E mark. This certification confirms that the glass meets the required safety and quality standards for use on public roads and is legally required for any vehicle that will be registered or driven on UK highways.

At SGI, every window we supply is E marked and carries full type approval certification. If you are sourcing glass elsewhere, always ask for proof of certification before committing. Non-certified glass may be cheaper upfront, but it can create serious problems at the point of registration or inspection.

2. The Exact Specification of Your Vehicle Matters

Van glass is not a one-size-fits-all product. The same manufacturer can produce multiple body variants of a single model, and the glass for a short-wheelbase version will not fit a long-wheelbase equivalent. Before ordering, you should have your vehicle's make, model, wheelbase, and body type to hand.

If you are unsure, our team can help you identify the correct unit. We stock windows for a wide range of manufacturers including Ford, Mercedes, Volkswagen, Vauxhall, Peugeot, Citroen, and more, and our staff are experienced at matching the right glass to the right vehicle.

3. Privacy Glass Is the Industry Standard for Conversions

If you are converting a van for passenger use, whether that is a campervan, minibus, or specialist vehicle, privacy glass is almost always the preferred choice. Our tinted glass offers 10% light transmission, which is the darkest tint available and gives any conversion a clean, professional finish.

Beyond aesthetics, privacy glass provides occupant comfort by reducing glare and heat build-up. It is worth specifying from the start rather than trying to retrofit tinted film afterwards, which rarely looks as good and can interfere with glass certification.

4. Specialist Vehicles Need a Specialist Supplier

Ambulances, police vehicles, emergency response units, and horse boxes all have glass requirements that go beyond standard van conversions. The window placements, aperture sizes, and sometimes the glass specifications themselves are different, and sourcing these units from a general glazing supplier can lead to fitment issues or unsuitable products.

SGI is the UK's leading supplier of ambulance windows and has extensive experience across a wide range of specialist vehicle categories. If your project falls outside the standard range, contact us directly to discuss your requirements. We handle one-off vehicles as well as volume orders.

5. Good Communication Saves Time and Money

The most common cause of delays in a conversion project is incomplete or incorrect information at the ordering stage. The more detail you can provide upfront, the faster we can confirm the right product, check availability, and get your order moving.

If you have drawings, specifications, or photos of the aperture you are working with, share them with us. Our team will work through the details with you to make sure you receive exactly what you need. We also offer a full after-sales service, so if anything is not right when your order arrives, we will resolve it quickly.