Guide to MOT Testing for Lorries, Buses, and Trailers: Requirements, Costs and Exemptions Explained

When it comes to keeping our roads safe and vehicles in top condition, the MOT test plays a big role — especially for larger vehicles like lorries, buses, and trailers. But let's face it: MOT requirements can be confusing. Whether you're a vehicle owner, operator, or someone new to heavy vehicles, it’s important to understand the ins and outs of MOT testing for commercial and passenger transport vehicles.

In this guide, we’ll break down everything you need to know in a way that’s simple, clear, and - dare we say - easy to follow. From when you need your MOT, to how much it costs, and who’s exempt, we’ve got it all covered right here.

What Is an MOT Test?

MOT stands for “Ministry of Transport.” It’s a mandatory roadworthiness test required in the UK for most vehicles to ensure they meet safety, emission, and legal standards. For lorries, buses, and trailers, the MOT test is sometimes referred to as the annual test or HGV/PSV test.

The test includes checks on:

• Brakes
• Steering and suspension
• Lights and indicators
• Tyres and wheels
• Chassis condition and structure
• Emissions

In short, it’s all about making sure your vehicle is safe for the road and environmentally friendly.

Who Needs an MOT Test?

The MOT test is required for most heavy goods vehicles (HGVs), passenger service vehicles (PSVs), and trailers that fit specific criteria. Generally, if you’re operating a lorry that weighs over 3.5 tonnes or a bus designed to carry more than 8 passengers, you’ll need to get an annual MOT test.

Here’s a quick breakdown of vehicles that must take this test:

• Lorries (HGVs) over 3.5 tonnes
• Buses and coaches (PSVs) – especially those used for hire or reward
• Trailers used with HGVs – particularly large or heavy ones

Still unsure if your vehicle qualifies? A good rule of thumb is: if it’s big, used to carry goods or people, and operates on UK roads, it likely needs an MOT.

When Does an MOT Become Due?

For new vehicles, testing doesn’t start right away. Each type of vehicle has its own first test deadline.

Important timeframes to remember:

• Heavy goods vehicles (HGVs): First MOT is due 12 months after registration.
• Public service vehicles (PSVs): Also due a test one year from first registration.
• Trailers: Require the first annual test one year after they were first used on the road.

Pro tip: Don’t wait for a reminder! You can check due dates online with your vehicle registration number to avoid fines or downtime.

Where Do You Take the MOT Test?

You might think you can just pop into any MOT garage… but not quite. Lorries, buses, and trailers must be tested at Authorised Testing Facilities (ATFs).

These are specialist testing centres equipped to handle large commercial vehicles. Many of these are operated in partnership with businesses, but DVSA (Driver and Vehicle Standards Agency) staff carry out the actual test.

To find an ATF near you:

• Search the official ATF directory

Remember: Book early – especially during busy seasons or before large bank holidays.

What Does the MOT Test Cost?

Unlike car MOTs where a garage may charge what they like up to a maximum, tests for larger vehicles follow maximum fee guidelines set by the government. The actual amount can vary by vehicle type.

Rough MOT cost estimates:

• Lorries (3.5 to 7.5 tonnes): up to £97
• Lorries over 7.5 tonnes: typically around £148-£209, depending on axles
• Buses (PSVs): about £96-£150
• Trailers: £56-£81 depending on size and axles

Don’t forget: Additional charges may apply if your vehicle needs a re-test or repairs.

Are There Any Exemptions?

Yes, some vehicles do not need to go through the MOT test process. These exemptions usually exist because these vehicles are used in specific ways, or under certain conditions that reduce risk on public roads.

Vehicles that might be exempt include:

• Mobile cranes
• Semi-trailers used for show or exhibition
• Historic vehicles (usually over 40 years old and no longer in commercial use)
• Certain works trucks or agricultural vehicles

But keep in mind, being exempt from MOT doesn’t mean you can skip maintenance. You’re still required to keep the vehicle safe and roadworthy at all times.

What Happens If You Miss Your MOT?

This is something many people forget about, especially if the test is only yearly. But missing your MOT can lead to:

• Fines – You could face a fine of up to £2,500.
• Points on your licence.
• Vehicle impoundment if used when unlicensed or untested.
• Invalidated insurance in case of an accident.

It’s not worth the risk. Always check the due date and plan your test ahead of time.

What Paperwork Do You Need?

When you take your vehicle in for its MOT, the testing staff will usually already have access to much of your information. But it's helpful (and time-saving) to bring:

• Vehicle registration certificate (V5C)
• Previous MOT certificate (if applicable)
• Lifting or inspection documentation for trailers

Make sure your number plates are clean and easy to read. That alone can cause delays or failure during inspection.

Want to Make Life Easier? Use the MOT Reminder Service

Life gets busy. To avoid forgetting your MOT, sign up for an MOT reminder service. It's free and so convenient.

If you manage a fleet or company vehicles, consider investing in fleet maintenance software to alert you well in advance about any due dates.

Need a Re-Test? Here's How That Works

If your vehicle fails its annual test, don’t panic. It happens. But what you do next depends on whether:

• The vehicle stays at the testing centre for repair
• Repairs are done elsewhere

You might qualify for a partial re-test (which is cheaper) if you fix the issue quickly — usually within 21 days. Fix it sooner? Even better. Always ask the ATF staff what the options are, as some centres have different rules.

Final Thoughts

Getting your MOT sorted for a lorry, bus, or trailer isn’t just ticking a legal box. It’s about taking responsibility — for your safety, your cargo, your passengers, and everyone else on the road.

Yes, the rules can feel like a maze sometimes. But once you break it down, it all comes down to a few simple principles: Stay safe. Stay legal. Stay ahead of deadlines.

So whether you're a seasoned fleet operator or just got your first truck, make MOT testing a top priority.

Need More Information?

For up-to-date regulations, forms, fee tables, and more details, visit the official government page:

https://www.gov.uk/mot-lorry-bus-trailer

Stay informed. Stay compliant. Drive smart.