If you are moving residence from the UK or any other European country to Guernsey, all that is needed is a full inventory of the effects.
What Customs Forms do I have to fill in if I move to Guernsey, are there any Duties Payable?
If you are moving from outside of the European Community, as well as an inventory, a Personal Effects Declaration form, known as a C16 form is also needed. Personal property of persons transferring residence from a third country to the Bailiwick may be admitted free of duty provided certain conditions are met (see c16 Form for more information). Any alcohol or tobacco products will be subject to a duty charge.
The C16 form is available for download on this page.
You should also contact Population Management in order to obtain a certificate/permit that allows you to live and work in the island.