Trailer Registration in the UK – V5C, DVLA Documents and Step-by-Step Guide [2026]

Trailer registration in the UK is a topic that affects thousands of vehicle owners — from haulage companies importing semi-trailers from Europe, to used-car dealers towing transporter trailers, to private individuals buying a caravan or luggage trailer. UK regulations set out precisely which trailers must be registered and which may be used on the road without registration. This guide explains: which weight categories (O1, O2, O3, O4) require registration, how to register a trailer imported from Europe step by step (form V55/4 or V55/5), what documents to submit to DVLA, what to do when a trailer has no VIN, and how the special V765 procedure works for trailers without documentation. The article is current for 2026.

Which trailers require registration in the UK

The registration requirement depends on the trailer's gross vehicle weight (GVW) category:

Category	GVW	Registration requirement
O1	up to 750 kg	None — registration is voluntary
O2	750–3,500 kg	Mandatory
O3	3,500–10,000 kg	Mandatory
O4	over 10,000 kg	Mandatory

O1 trailers (up to 750 kg) — small luggage trailers, light open trailers, boat trailers — do not require registration with DVLA. They need no number plate and no V5C. The only requirements are adequate lighting and a functional overrun brake (if GVW exceeds 750 kg, that is already O2).

Caravans, light cargo trailers, touring trailers (O2) — registration is mandatory. The vehicle receives a V5C (logbook) and its own number plate.

Semi-trailers and heavy trailers (O3 and O4) — registration is mandatory, handled by the DVLA Heavy Vehicles Section. Number plates are in the VTG format (Vehicle Testing and Goods).

Form V55 — which version to use

DVLA uses different versions of form V55 depending on the vehicle's status:

Form	Application
V55/4	New trailer — being registered in the UK for the first time (e.g. purchased from a dealer, never previously registered)
V55/5	Used trailer imported from abroad or previously registered outside the UK
V62	Application for a duplicate V5C (when the original logbook has been lost)

For a trailer imported from Europe (whether used or new, previously registered in the EU) — the correct form is V55/5.

Form V55/5 requires completion of: - Vehicle details: VIN, make, type, type-approval category (O2/O3/O4), GVW - Owner details: first name, surname / company name, UK address - Import information: country of previous registration, date of import - Applicant's signature

V55 forms are not available to download online — you must order them by calling DVLA (0300 790 6802) or collect them in person from a local DVLA office.

Documents required when registering a trailer imported from the EU

The full set of documents depends on the trailer's category and history. Below is the complete list:

Mandatory documents:

Document	Notes
Form V55/5	Completed and signed
Proof of ownership	Purchase invoice, sale agreement, deed of gift
CoC or IVA/SVA certificate	Certificate of Conformity (technical compliance)
Proof of duty and VAT payment	C88 (customs) or C79 (VAT) document
Registration document from the EU country	E.g. Polish vehicle registration certificate or European equivalent
Proof of identity (private individual)	Passport or UK driving licence
Company registration number (if registering as a business)	Companies House registration number

Supporting documents (may be required):

• Annual Test certificate or confirmation of a booked inspection (for O3/O4)
• Attestation of Conformity from the manufacturer (if a full CoC is unavailable)
• Customs declaration from the UK Customs Declaration Service (CDS)

Trailer VIN — what to do when there is none

VIN (Vehicle Identification Number) — a 17-character identification number — is mandatory for all vehicles and trailers manufactured after 1 August 1980 (ISO 3779 and ISO 3780 standards).

Trailer manufactured before 1981 — may have no VIN. DVLA will in that case accept alternative identifiers: manufacturer's serial number, chassis number, axle number.

Trailer manufactured after 1981 with no VIN — this is a serious problem. Possible causes: - VIN has been removed (illegally — suggests theft) - VIN plate has fallen off or is illegible (rusted, damaged) - The semi-trailer was heavily modified and the VIN was lost during rebuilding

If the VIN is illegible but there is no suspicion of theft — you can arrange for it to be read by an accredited surveyor or a DVLA specialist (Vehicle Identity Check, VIC).

The VIN plate on trailers is usually located: - On the main longitudinal chassis rail (most commonly the left side, near the 5th cross-member) - On the front bulkhead (particularly on refrigerated semi-trailers) - In the spare wheel recess (older touring caravans)

V765 procedure — registering a trailer without documents

If you are buying a trailer that has no documents at all (no CoC, no EU registration document, no manufacturer's invoice) — the standard V55 procedure will not suffice. DVLA then applies the V765 procedure.

V765 is intended for: - Historic trailers (classic trailers) that have not been registered for many years - Trailers whose documents were lost in a fire, flood, or through neglect - Trailers purchased at auction or salvage, where the chain of ownership is incomplete

V765 procedure step by step:

1. Complete form V765 (available on GOV.UK)
2. Attach all available proof of ownership (receipt, seller's declaration, photographs of the trailer showing the chassis serial number)
3. Attach a report from an accredited mechanic or surveyor confirming the technical condition and uniqueness of the chassis
4. DVLA verifies the history and checks the stolen vehicle database (Police National Computer)
5. If verification is successful — DVLA assigns a VIN and issues a V5C

Processing time for V765: 4–12 weeks. Administrative fee: £55 (standard registration fee).

VED (road tax) for trailers — who pays, who is exempt

Good news for trailer owners: the majority of trailers in the UK are exempt from VED (road tax).

Trailer type	VED
O1 trailers (up to 750 kg)	Fully exempt
Touring caravans O2	Fully exempt
Cargo trailers O2	Fully exempt
O3 and O4 trailers (heavy cargo)	Fully exempt
Trailers with their own engine (e.g. certain types of semi-trailer with a refrigeration unit)	Subject to VED as a vehicle

Exemption from VED does not remove the obligation to hold an annual Annual Test (for O3/O4), insurance (required by law, usually as an extension of the towing vehicle's policy) or operator obligations (Operator Licence for businesses).

Trailer number plates — own plate or towing vehicle's plate

A trailer in the UK must carry its own rear number plate — independent of the towing vehicle's (car or lorry) plate. This is a legal requirement for categories O2, O3 and O4.

Requirements for a UK trailer number plate: - White background (a trailer has only a rear plate — in the UK rear plates are white, not yellow) - Black digits/letters in the standard UK font - Number plate lighting (mandatory and in working order) - Standard size: 520 × 111 mm (standard trailer) or 285 × 203 mm (square plate — for trailers where the long plate does not fit)

An incorrect plate (e.g. yellow instead of white) can result in a fine of up to £1,000. Many people importing trailers from the Continent overlook this detail — European trailers carry yellow rear plates as standard, but in the UK a trailer's rear plate must be white.

What to do if DVLA rejects the registration application

The most common reasons for rejection: 1. Incomplete documentation — missing CoC, missing proof of import, missing identity documents 2. VIN discrepancy — the VIN on the chassis differs from the VIN in the documents (may suggest theft or fitment of a replacement chassis) 3. No Annual Test (for O3/O4) — DVLA will not register a semi-trailer without a valid inspection or a booked inspection appointment 4. Technical defects — DVLA may refer the trailer to a DVSA inspection before registration

In the event of rejection: DVLA sends a letter explaining the shortcomings. You have 30 days to supply the missing documents without paying the fee again. After 30 days — a new application and a new £55 fee are required.