FAQ About Buangkok CC Counter

All Identity Card (IC) holders, including Singapore citizens and permanent residents who are residing overseas, are required to report a change of residential address within 28 days of moving into a new (local or overseas) residence. Singapore Citizen and Permanent Resident children who have not been issued ICs do not need to update their address.

source: https://www.ica.gov.sg/documents/ic/update_residential_address