In principle, customs clearance is necessary if you want to ship your goods outside the European Union. However, customs clearance is not necessary for all shipments outside the European Union.
If the invoice value of your shipment is 1.000 € or more and/or the weight of a shipment is 1.000 kg or more, you need an export declaration and a commercial invoice. If your shipment is worth less than 1.000 € and weighs less than 1.000 kg, a commercial invoice is sufficient.
Exception Great Britain: An export declaration is required for all shipments in and out of the UK.
If customs clearance is required in your case, you will find all information by clicking here.