Trailer Annual MOT Test (UK Guide)

Tradespeople, plant hire firms and farmers face an MOT regime most car drivers never encounter. Goods trailers above 1020kg unladen are tested annually by DVSA in the same way as HGVs, with no exemption for occasional use. A free MOT history check covers your towing vehicle, and the rules below cover the trailer itself.

Which trailers actually need a test

The Goods Vehicles (Plating and Testing) Regulations 1988 set the threshold at 1020kg unladen for goods-carrying trailers. Anything heavier needs an annual DVSA test from its first anniversary in service. Trailers below 1020kg unladen — small box trailers, single-axle car trailers, jet-ski trailers — escape the regime entirely.

Touring caravans, regardless of weight, are exempt because they are designed for habitation rather than goods. Plant trailers, livestock trailers and large flatbeds typically sit well above 1020kg unladen and are firmly inside the testing regime.

• Box trailers over 1020kg unladen: annual test required
• Plant trailers (Ifor Williams GP, GH range): usually testable
• Livestock trailers: testable above 1020kg unladen
• Touring caravans: exempt regardless of weight
• Small DIY trailers under 1020kg: exempt

How the trailer test differs from a car MOT

The trailer test is run by DVSA examiners — not Approved MOT garages — at Authorised Testing Facilities (ATFs). The same inspection regime covers HGVs and PSVs. You cannot book a trailer test at a high-street MOT garage; the facility must hold ATF status with a heavy-vehicle brake roller, axle lift and inspection pit.

There is no Inspection Manual section dedicated to trailers in the standard MOT manual; instead, the test follows the DVSA Heavy Goods Vehicle Inspection Manual. Pass standards are stricter than a Class 4 MOT in several areas, particularly brake imbalance and chassis corrosion.

What's checked during the test

Brakes are the largest single section. The trailer is rolled onto a heavy-vehicle brake tester and each axle is loaded — both service brake and parking/handbrake performance is measured against minimum efficiency and balance figures. Hitch condition, breakaway cable, jockey wheel, suspension, tyres, lights, reflectors, mudguards, body integrity and chassis corrosion are all inspected.

ABS systems on more modern trailers are scanned for fault codes. The DVSA examiner also checks the ministry plate (the metal data plate showing the trailer ID number) and the manufacturer's plate showing axle and gross train weights. A missing or illegible plate is an automatic refusal.

• Service and parking brake efficiency on the rolling road
• Hitch and coupling head condition, including breakaway cable
• Tyre condition, age (DOT code) and tread depth
• Lighting and reflector function across all circuits
• Chassis and body for corrosion, cracking and weld failure
• ABS fault scan where fitted
• Ministry plate and axle data plate legibility

Booking a trailer test

Bookings go through the Manage Vehicle Tests service on GOV.UK or via your ATF station directly. You need the trailer ID number (visible on the ministry plate), the operator's address and a planned test date. Most ATFs charge a station fee on top of the DVSA test fee — total cost typically lands £130-180.

Lead times vary. Rural ATFs can book within a week; busy southern stations often have 4-6 week waits in summer. Plan ahead — there is no equivalent of a partial MOT retest, so a fail means a full re-book if the repair takes more than a working day.

First-time test bookings need a VTL number obtained from DVSA before the trailer can be tested. The application is free and submitted online via the operator licensing portal. Most new trailer purchases include a VTL transfer as part of the sale, but homemade or imported trailers need their own application — allow 4-6 weeks for the paperwork to clear before booking the first test.

Fees and what to expect to pay

DVSA fees for trailer tests are published on GOV.UK and updated annually. As of the 2025-26 schedule, an annual goods trailer test costs around £85 for the DVSA element. The ATF station typically adds £40-80 for use of its facilities, examiner attendance and any pre-test inspection.

Re-tests follow a separate fee table. A re-test on the same day, with no major rectification, is around £14. After more than a working day or away from the original ATF, the full fee applies again. Compared to a Class 4 MOT cost guide, the trailer test is roughly two to three times the price.

Operators with multiple trailers can save money by booking block tests at the same ATF on the same day. Most stations offer a discounted station fee for the second and subsequent trailers in a single visit, typically reducing the per-trailer cost by £15-25. Plant hire firms, agricultural contractors and event companies running fleets of trailers benefit most from this approach.

Common trailer MOT failures

Brake imbalance is the most common reason for refusal — uneven braking between axles, often caused by seized auto-adjusters, contaminated linings, or dragging wheel cylinders. Hitch and coupling failures (worn jaws, damaged spring assist) are next, followed by lighting faults from corroded multi-pin connectors.

Chassis corrosion is rising as a cause, particularly on older Ifor Williams trailers used in coastal areas. Welded repairs in load-bearing zones must be carried out by a competent welder and presented with documentation. Tyre age (over seven years from the DOT code) catches out occasional-use trailers — the rubber perishes long before the tread does.

Wheel-bearing play is another frequent finding. Trailers used infrequently or stored outdoors develop bearing pitting that shows up under the examiner's hand-shake test. Annual greasing is cheap insurance — a single grease cartridge and an hour of self-service usually prevents the £150-300 bearing replacement and re-test cost. Pre-test grease and bearing inspection should be part of every operator's annual routine.

Class 7 overlap and tow-vehicle rules

If your tow vehicle is a Class 7 van (3000-3500kg DGW) and you regularly tow a tested trailer, both run on separate annual cycles. The van follows the standard Class 7 MOT process, capped at £58.60. The trailer follows the DVSA test described above. Read our Class 4 vs Class 7 breakdown if your gross train weight is creeping toward operator licence territory (3500kg combined).

Tow-car drivers passing their licence on or after 1 January 1997 must check the BE category on their licence — without it, anything beyond a small trailer requires a separate test. DVSA enforcement on this has tightened sharply since 2024.

Combined operations crossing the 3.5-tonne threshold attract operator licence rules. Anyone running a tow vehicle and tested trailer with a combined gross train weight above 3500kg for hire and reward needs a Restricted O-licence at minimum. Penalties for unlicensed operation include vehicle impoundment, six-figure fines and disqualification from operator licensing for up to five years.

Frequently Asked Questions

Do all trailers need an MOT in the UK?

No. Only goods trailers with an unladen weight above 1020kg need an annual DVSA test. Touring caravans are exempt regardless of weight, and small trailers below the threshold need no formal test, although roadworthiness is still the owner's legal duty.

Where can I book a trailer MOT?

Bookings go through GOV.UK's Manage Vehicle Tests service or directly with an Authorised Testing Facility. Standard MOT garages cannot test trailers — the test requires DVSA examiner attendance and a heavy-vehicle brake roller.

How much does a trailer MOT cost?

The DVSA fee is around £85 for a standard goods trailer test. ATFs add £40-80 for use of their facilities, so total cost is typically £130-180. Retests cost around £14 if completed the same day at the same station.

What is checked in a trailer MOT?

Brakes (service and parking), hitch and coupling, breakaway cable, suspension, tyres and DOT age, lighting, reflectors, mudguards, body and chassis corrosion, and ABS fault codes where fitted. The ministry plate must also be legible.

How long does a trailer MOT take?

Typically 45-90 minutes depending on axle count and trailer complexity. Twin-axle plant trailers and ABS-equipped trailers take longer than single-axle box trailers because each axle is tested separately on the brake roller.

Can I drive a failed trailer home?

Only if the failures are not classed as dangerous and you can return it to base for repair safely. Driving a trailer with a dangerous defect on a public road is an offence under the Construction and Use Regulations and can attract a £2,500 fine plus three points on your driving licence.

Trailer MOTs are a different regime from car MOTs, with stricter standards and DVSA-only testing. Run a free MOT history check on the towing vehicle, book the trailer test through GOV.UK well in advance, and budget for the full station fee.