The building was commissioned by John Lloyd, County Surveyor of Caernarfonshire, as a military headquarters and was completed in 1855.

[1] It became the headquarters of units of the Carnarvon Rifle Volunteer Corps when they were raised in March 1860 and went on to become the headquarters of the 3rd Volunteer Battalion, Royal Welch Fusiliers, when that unit was formed in 1897.

[2] The battalion was mobilised at the drill hall in August 1914 before being deployed to Gallipoli and ultimately to Palestine.

[2] It reverted to infantry stratus and amalgamated with the 7th Battalion, Royal Welch Fusiliers to form the 6th/7th Battalion, The Royal Welch Fusiliers in 1956.

[6] Although the Ministry of Defence had previously indicated its intention to close the barracks,[7] a reprieve was announced in March 2017.