Inviolability of premises is a cornerstone of diplomatic law, codified in Article 22 of the Vienna Convention on Diplomatic Relations (VCDR, 1961). It imposes three distinct obligations on the receiving state: (1) agents of the host state may not enter mission premises without the consent of the head of mission; (2) the host state has a special duty to take all appropriate steps to protect the premises against intrusion, damage, disturbance of the peace, or impairment of dignity; and (3) the premises, furnishings, property, and means of transport are immune from search, requisition, attachment, or execution.
The rule is absolute on its face: there is no express emergency exception in Article 22, even for fire, public health threats, or pursuit of a fugitive. Most scholars treat consent as the only lawful basis for entry, though some host states have argued for an implied necessity exception (a position widely rejected in state practice).
The scope covers buildings and land used for mission purposes, regardless of ownership, including the residence of the head of mission (Article 30 extends comparable protection). Consular premises receive a similar but slightly weaker protection under Article 31 of the Vienna Convention on Consular Relations (1963), which permits presumed consent in the event of fire or other disaster requiring prompt protective action.
Inviolability does not make premises extraterritorial — they remain the territory of the host state — but it functionally bars enforcement jurisdiction. Abuse of the principle (e.g., harbouring fugitives, weapons storage) is addressed through diplomatic channels, persona non grata declarations, or severance of relations rather than forced entry.
Landmark incidents shaping interpretation include the 1979 seizure of the U.S. Embassy in Tehran (adjudicated in United States Diplomatic and Consular Staff in Tehran, ICJ 1980) and the 1984 Libyan People's Bureau shooting in London.
Example
When gunfire from inside the Libyan People's Bureau killed PC Yvonne Fletcher in London in 1984, the UK declined to forcibly enter the premises and instead severed diplomatic relations and expelled the occupants under VCDR procedures.