When you are choosing a van to convert, start from how you plan to use it, then check, in this order, its length, its interior height, its width for sleeping, the weight it can still carry and the paperwork your build will trigger. The right van is the one that leaves you room to spare on all six, long before brand or paint colour come into it.
1. Your use decides everything when choosing a van to convert: weekends, month-long trips and full-time living call for very different volumes.
2. Length, height and interior width are measured in millimeters and compared with your actual layout plan.
3. Weight is the most common trap: on a standard category B licence in the EU, the van must stay at or under 3,500 kg fully loaded.
Start with how you will live in the van
The question that shapes every other one is how you intend to live in the van. A van built for weekends and a few summer weeks does not need the space of one you work in, cook in and spend the winter in. Write down how many people will sleep on board, how many nights in a row you want to go without a campsite, and whether you plan to travel in cold weather.
Choosing a van to convert without regrets starts with what you want to do inside it, and then rules out everything that will not allow it, before you even open a listing.
Length, height and width: the codes to check
When choosing a van to convert on dimensions, panel vans come in several lengths and heights, usually labelled L1, L2, L3 and H1, H2, H3. Those codes do not match the same measurements across brands, so always ask for the exact interior dimensions in millimeters, from the spec sheet or the seller. Length sets what you can fit (a fixed bed, a galley, a dinette, storage) and you pay for it in handling; height decides whether you can stand up. Once insulation, flooring and a ceiling are in, you lose several centimeters, so measure the bare interior height and subtract your planned build before you decide.
Interior width decides how you sleep. Many conversions put the bed across the back to free up length, but that only works if the width is greater than the height of the tallest person sleeping on board, once insulation and paneling are in. Measure at mattress height, not only at floor level: some vans have more sloped sides than others. Spot everything that eats into usable width too (wheel arches, body ribs, a bulkhead behind the front seats), since each one dictates where furniture can go.
Weight and payload when choosing a van to convert
Weight causes more trouble after purchase than any other factor. The EUR-Lex summary of the EU driving licence directive defines category B as covering vehicles weighing up to 3,500 kg and seating no more than eight passengers; rules outside the EU differ, so check your own country’s licence categories. A newer directive adopted in 2025 raises that limit to 4.25 tonnes for vehicles running on alternative energy, and according to the European Parliament’s research service it has to apply by November 2029 at the latest.
The maximum authorized mass appears on the registration document, but what matters for a build is the payload: the gap between that mass and the van’s empty weight. According to the Victron Energy datasheet for its Lithium Smart batteries, a 100 Ah LiFePO4 battery alone weighs 14 kg. If you have not run the numbers yet, our guide on how to size a van battery bank gives you the capacity, and so the weight, to plan for.
List everything you plan to carry, with a weight for each item, before you sign. If the total gets close to the payload, that is your cue to keep choosing a van to convert with a lighter base, a simpler build, or more headroom on the maximum mass.
Fixed furniture and registration: plan for the paperwork
Once a panel van gets a fixed bed, a kitchen or permanent seating, many countries treat it differently from a plain cargo van, and changing its registration category can mean inspections, a formal application and fees. The exact procedure depends on where the van is registered, so check with your national vehicle authority before you start building.
Knowing this at the buying stage matters because registration rules can dictate how the furniture, the bed and the electrics have to be installed. Choosing a van to convert with that step in mind saves you from tearing out a finished build later.
Prepare the viewing of each van to convert
Before you set off, note for each listing what you want to confirm in person (year, mileage, length, height, maximum mass), with the minimum dimensions you need for the bed and the galley. On site, three tools cover it: a tape measure for length, width at mattress height and interior height; a torch for the floor, wheel arches and underside; your phone to photograph the registration document and every flaw you spot.
Ask the seller specific questions: how the van was used, service records, any previous build or equipment removed. When sizing up a van to convert, those answers, and how the seller gives them, often separate two vehicles that look identical on paper. Give yourself permission to walk away: a van that barely meets your criteria today will cost you time through the whole build.
Used or new: what to check before you sign
Most people choosing a van to convert start with a used one, often an ex-fleet work vehicle. Beyond the usual mechanical checks, a future camper needs a few specific ones: rust on the floor and wheel arches, which old ply lining can hide, the state of the seals and the roof, and any holes or brackets left behind by the van’s working life. Make sure the registration document matches the van in front of you, category and maximum mass included: a pre-purchase inspection by an independent garage costs far less than a repair discovered after the build is done.
| How you will use it | What to prioritize |
|---|---|
| Weekends and short breaks | A short, easy-to-park van with a simple sleeping setup |
| Trips lasting several weeks | Standing height and enough length for a fixed bed and a real galley |
| Full-time van life | Volume, a comfortable payload for water and power, and a build planned around registration from day one |
Once you have found the van, the next step is costing the build and sizing the electrical system, always keeping an eye on how much payload you have left.