https://www.epo.org/en/service-support/faq/law-practice/unitary-patent/register-unitary-patent-protection/how-can-i

How can I request a change of address for the proprietor of the Unitary Patent?

You can request a change of address for the proprietor following the same procedure as for European patent applications.

The request must be filed in writing; no fee is due. If the address change is from a non-EPC to an EPC contracting state, evidence must be provided, e.g. an extract from the commercial register.