A finished van conversion usually adds somewhere between 300 and 600 kg to your empty van, and more if you go heavy on water, batteries and timber. Payload is the number that decides whether you are legal: it is the gap between your van's empty weight and its maximum allowed weight, which in Europe is usually 3,500 kg on a standard B licence. Most self-built vans quietly creep over that line, and almost nobody finds out until the build is done.
We know because we got close to that line ourselves. Here are the real numbers, what eats your payload fastest, and how to stay under the limit without weighing every screw.
How much weight does a conversion actually add?
For a typical European panel van build, the conversion itself adds roughly 300 to 600 kg before you load any of your own stuff. Insulation, plywood, furniture, a bed frame, a kitchen, plumbing and an electrical system all stack up faster than you expect. The American builders we read tend to quote 450 to 1,360 kg (1,000 to 3,000 lb), partly because their rigs run bigger. The lesson travels: the build is heavier than the spreadsheet in your head.
What is payload, and why does it matter so much?
Payload is everything your van can legally carry on top of its empty weight. Your maximum allowed weight is fixed by the manufacturer and printed on the VIN plate. Your empty weight is the van as it left the factory. Subtract one from the other and you have the budget for the conversion, your water, your gear, your fuel and the two humans up front.
It matters because aftermarket changes do not raise the limit. Fitting heavier-duty tyres or suspension can make an overloaded van feel fine, but the legal maximum stays exactly the same. You cannot upgrade your way out of the number.
Our real numbers (Boxie)
Our Peugeot Boxer L3H2, Boxie, has a maximum total weight of 3,500 kg. Empty, she sits around 1,950 to 2,000 kg. That left us roughly 1,500 kg of payload on paper. Sounds like plenty. It is not.
Fully packed, without us inside, Boxie ended up around 3,200 kg. The conversion, the water, the tools, the pizza oven (non-negotiable) and the slow drift of "we will just add this one thing" ate most of that 1,500 kg buffer. We were legal, but with far less margin than we assumed on day one.
Weight is the one mistake you cannot fix at the end. A bad layout you can live with. An overweight van you have to take apart.
What adds the most weight?
A few things do most of the damage, so this is where to pay attention.
- Water. One litre is one kilogram. A 100 litre fresh tank is 100 kg the moment you fill it.
- Batteries. A lead-acid leisure battery can weigh 25 kg or more. Lithium is lighter for the same capacity, around 12 kg per 100Ah, at a higher price.
- Timber and ply. Sheets of plywood and battens are deceptively heavy and they are everywhere in a build.
- Furniture and appliances. A fridge, a sink, a fixed bed and worktops add up quietly.
- Roof gear. A rack plus solar can be 30 to 50 kg, and it sits high, which hurts handling more than weight down low.
How do you stay under the limit?
You track weight from day one instead of hoping at the end. Write down the weight of big items as you buy them. Keep the heavy things low and between the axles. And before any real trip, drive to a public weighbridge and get the actual gross weight plus the front and rear axle loads. Paper estimates miss things. Scales do not.
This is the part we got wrong, so we built our weight check into the kit. The point is simple: know your number before the road tells you the hard way.
The short version
Expect a conversion to add 300 to 600 kg, know your payload before you start, and weigh the finished van before you trust it. Water, batteries and timber are the usual culprits. Plan for them early and you keep both your van and your weekend plans intact.
Frequently asked questions
What is the weight limit for a campervan on a normal driving licence?
In the Netherlands and most of Europe, a standard category B licence lets you drive a vehicle up to 3,500 kg gross weight. Above that you need a C1 licence. Almost every panel van conversion is built on a 3,500 kg base for this reason.
How do I find my van's payload?
Take the maximum allowed weight from the VIN plate or vehicle registration, then subtract the empty (kerb) weight. The difference is your payload: everything the conversion, your gear, water, fuel and passengers must fit inside.
What happens if my converted van is overweight?
You risk fines, your insurance can be voided after an incident, and braking and handling get worse. An overweight van is both a legal and a safety problem, which is why you check it at a public weighbridge before any big trip.
Do solar panels and a roof rack add much weight?
Each item is modest, but a roof rack plus panels can easily add 30 to 50 kg, and it sits high up. High weight raises the centre of gravity and affects handling more than the same weight low in the build.
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