Choosing the Right Horsebox Size: 3.5t, 7.5t or HGV?
How to choose between a 3.5t horsebox, 7.5t and HGV for UK ownership — licence rules, payload maths and running costs.
Start with the licence, not the lorry
Your driving licence determines what you can legally drive. Get this wrong and your insurance is void.
- B licence (standard car licence, issued after 1997): 3.5t total. That's the whole lorry — chassis, fuel, water, tack, hay, human and horse.
- C1 licence (grandfathered pre-1997, or a modern test): up to 7.5t.
- C licence (full HGV): anything above 7.5t.
The 3.5t payload problem
A "3.5t horsebox" isn't 3.5 tonnes of horse capacity. The empty lorry usually weighs 2,600–2,900 kg. That leaves 600–900 kg of payload for horse, tack, water, hay and a driver. One 16hh warmblood plus kit plus a full tank of diesel can easily push you over.
If you have one horse under 550 kg, a 3.5t is workable. Two horses, or one big horse and competition kit, and you'll need something bigger.
When 7.5t is the sweet spot
Most amateur two-horse owners land here. Payload is generous, running costs are still manageable, and secondhand supply is deep. You will need C1 on your licence, so factor in the test if you don't have it.
When to go HGV
If you routinely move three or more horses, need overnight living, or travel Europe, a proper HGV horsebox is the answer. Insurance, servicing and O-licence rules kick in — this is a step up in commitment.
Cheaper than owning: hire
If you only need a lorry six times a year, hire wins on total cost. Budget £90–£160 a day for a 3.5t from a UK hire firm. See our guide on renting vs buying horse equipment for the full break-even.