Change vehicle details on a V5C registration certificate (log book)
What evidence to give
You must give DVLA evidence or written confirmation if you make any of the following changes to your vehicle. Your V5C update will be rejected if you do not.
Change of engine number or cylinder capacity (cc)
You need to provide one of the following:
- a receipt for the replacement engine that includes the engine number and cylinder capacity
- written evidence from the manufacturer
- an inspection report provided for insurance purposes
- written confirmation on headed paper from a garage (if the change took place before you bought the vehicle)
Change of fuel type
You need to provide evidence if:
- your existing engine is converted – the confirmation must be on headed paper from the garage that did the work
- a new engine is fitted – provide the receipt as confirmation
Change of weight of a larger vehicle
If you change the weight of a large vehicle (for example, a campervan or goods vehicle), you’ll need to provide either:
- a plating certificate
- a design weight certificate
Change of body type to motor caravan
Check what evidence you need when you convert a van to a campervan or motor caravan.