Building certification tiers across the NT

The NT's building certification system has two tiers, with the rest of the territory falling outside of the building control area.

A map of the Northern Territory showing the Darwin, Lake Bennett and Alice Springs as Tier 1 zones. Several towns are Tier 2 zones and the rest of the territory is outside of the building control area.
Katherine Gorge, Brewer Estate and Namarada (not displayed on the map) are also Tier 2 zones.
ABC News Source: NT government