A diplomatic apartment is a residential premises occupied by a member of a diplomatic mission—most commonly the head of mission or a senior diplomatic agent—that, by virtue of its occupant's status, attracts protections under international law. Under Article 30 of the Vienna Convention on Diplomatic Relations (1961), the private residence of a diplomatic agent enjoys the same inviolability and protection as the premises of the mission itself, meaning host-state authorities may not enter without consent. Papers, correspondence, and (with limited exceptions) property inside are likewise protected.
The term is sometimes used loosely to describe any flat rented or owned by an embassy to house staff, but the legal protections vary by the occupant's rank. Residences of diplomatic agents receive full inviolability; those of administrative and technical staff are generally protected only if the staff member is not a national or permanent resident of the receiving state (Article 37). Service staff and private servants receive narrower protections.
In practice, diplomatic apartments serve several functions: secure housing, venues for small-scale representational events, and occasionally informal back-channel meetings shielded from host-state surveillance. Receiving states may regulate acquisition of real estate by foreign missions, and many require notification of addresses used to house accredited personnel. Disputes have arisen over whether protections extend to apartments used for commercial activity or sublet to non-diplomats—the Convention's protections do not cover acts outside official functions or premises misused for non-diplomatic purposes.
Misuse can trigger expulsion of the occupant as persona non grata (Article 9), though the premises themselves remain inviolable until the diplomat's functions end and a reasonable departure period elapses.
Example
In 2018, following the Skripal poisoning, the UK expelled 23 Russian diplomats whose London diplomatic apartments lost their Article 30 protections after their accreditation was withdrawn.