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If you modify a chassis, monocoque bodyshell or frame to change the dimensions or appearance of the vehicle, this is known as a ‘structural modification’. 

You must tell DVLA if you make a structural modification to a vehicle.

There’s a different process to tell DVLA if you replace the chassis, monocoque bodyshell or frame to match the manufacturer’s specifications.

You do not need to tell them about any other repairs or restorations. 

What counts as structural modification

Structural modification of cars, motorcycles or light goods vehicles (under 3,500kg) can include:

• altering the chassis, monocoque bodyshell or frame (for example changing the shape so it looks like a different vehicle type)
• lengthening, shortening or widening the frame of a motorcycle
• cutting, lengthening, or shortening roof pillars
• removing the roof
• removing an integrated roll cage
• modifying or removing load-bearing sub-frames or support members
• making additional holes within 30cm of a suspension, steering, braking or seatbelt mounting point
• turning a motorcycle into a tricycle

You also need to tell DVLA if you modify a vehicle by converting it to run on electricity, even if you do not make structural modifications like changing the appearance.

See what else may count as a structural modification.

After you make the change

You should have your vehicle MOT checked and ensure your vehicle insurance is still valid.

You can get an individual vehicle approval inspection (IVA) instead of an MOT if you have a car.

Turning a motorcycle into a tricycle

If you turn a motorcycle to a tricycle using a conversion kit or plan, it must be registered as a kit-converted vehicle.

If you did not use a conversion kit or plan, you must tell DVLA about the structural modification.

If the vehicle has a welded tricycle system, DVLA will need to issue a vehicle identification number (VIN). You’ll need to get motorcycle single vehicle approval (MSVA).

If you need to tell DVLA about a structurally modified vehicle

Complete form V627/3 - ‘Modified vehicle statement’.

Send it to ‘Kits and Rebuilds’ at DVLA along with: 

• the vehicle log book (V5C)
• evidence of a current MOT, IVA or MSVA (if required)

After you tell DVLA about a structurally modified vehicle

DVLA will issue a new registration certificate (V5C) which states that the vehicle has been modified from the original manufacturer’s specification.

The vehicle will usually keep the original VIN. DVLA will tell you if there’s a reason it cannot.

If your vehicle cannot keep its original registration number

DVLA will give your vehicle a registration starting with ‘Q’ if its age or identity is in doubt.