[1] However, as the number of court cases in Caernarfon grew, it became necessary to commission a more modern courthouse for criminal matters: the site selected in Llanberis Road had been occupied by Segontium School, which had dated from 1912 but which had closed in 2005.

[5][6] It was designed by Austin-Smith:Lord in the Modernist style,[7][8] built by Balfour Beatty in dark blue and red brick at a cost of £12 million and was completed in May 2009.

[11] The left hand section was built in dark blue brick and was fenestrated with single, bi-partite and tri-partite casement windows on two floors, while the right hand section, which was projected forward, was built in red brick and featured a grey stone-clad portico on the left with Royal coat of arms at first floor level above, and a large expanse of glazing on the right.

[13] The building was subsequently sold to London & Capital Group and leased back from that company under a private developer scheme initiative.

[14] Notable cases included the trial and conviction of Colin Milburn, in November 2022, for the murder of his long-term partner, Buddug Jones.