New 3.5t Horseboxes for Sale in the UK

A 3.5 tonne horsebox and a 3.5 ton horsebox both refer to the same weight class vehicle, but the wording depends on country:

• Tonne (metric tonne) - used in the UK and Europe
  • 1 tonne = 1,000 kg
  • The correct term for horseboxes in the UK is usually 3.5 tonne
• Ton (imperial ton) - used mainly in the USA
  • 1 ton = 907 kg
  • Not generally used in UK vehicle classifications

Because horseboxes in the UK are regulated using metric measurements, a 3.5 tonne horsebox is the accurate term for listings, insurance, road tax, driving licence rules, and DVLA documentation.

The value of a 3.5 tonne horsebox depends on the age of the chassis and conversion, mileage, service history, payload capacity, overall condition, and any extras such as living space. Prices vary widely, so it's important to research comparable listings and verify the vehicle's condition before making an offer.

For a full pricing framework and inspection checklist, read our guide to buying a 3.5t horsebox.

Payload is what remains after you subtract the unladen weight of the horsebox from its Maximum Authorised Mass (MAM) of 3,500 kg. Most 3.5t horseboxes have a payload between 700 and 1,000 kg, though this varies significantly depending on the build.

Features that reduce payload include a heavier chassis, living accommodation, water tanks, generators and cosmetic extras. A single horse typically weighs 400-600 kg, so once you add tack, hay, water and personal kit you can be close to the limit on a lower-payload build.

Always check the VIN plate for the exact unladen weight or, better still, use a public weighbridge to confirm the real figure before you buy.

For more detail, read our guide to buying a 3.5t horsebox.

A standard Category B car licence is sufficient to drive a 3.5 tonne horsebox, provided the vehicle's Maximum Authorised Mass does not exceed 3,500 kg. This applies to anyone who passed their driving test on or after 1 January 1997.

Drivers who passed before that date also hold C1 entitlement (up to 7.5 tonnes) as standard, giving them additional flexibility if they upgrade to a heavier horsebox later.

One important caveat: some horseboxes marketed as "3.5t" are actually plated above 3,500 kg. Always check the V5C and VIN plate to confirm the true MAM before driving on a Category B licence.

If you plan to tow a trailer behind a 3.5t horsebox, you may need additional entitlement. Since 2021, Category B licence holders can tow trailers up to 750 kg without further testing, but heavier trailers may require a B+E test or equivalent.

For a full breakdown, see our Horsebox Driving Licence Requirements in the UK guide.

The 3.5t horsebox market is served by a number of well-established builders and converters. Some of the most popular names include:

• ALX Horseboxes - specialists in lightweight 3.5t builds with strong payload figures
• Bloomfields - well-regarded for stylish, high-quality coachbuilt horseboxes
• Equi-Trek - one of the UK's best-known manufacturers with a wide range of 3.5t models
• Equihunter - known for lightweight, high-payload builds
• Marlborough - a trusted name producing practical, well-finished horseboxes

The right choice depends on your budget, the payload you need, build quality and the layout that best suits your horses and travel requirements.

For guidance on what to look for, read our guide to buying a 3.5t horsebox.