NCC 2022 (National Construction Code): Volume 1 — Commercial (Class 2-9 buildings). Volume 2 — Residential (Class 1 & 10). Volume 3 — Plumbing. Performance-based: compliance via Performance Solution (alternative solution assessed by fire engineer/building surveyor) or Deemed-to-Satisfy (prescriptive). Building classifications: Class 1a (house), 1b (boarding), 2 (apartments), 3 (residential other), 4 (dwelling in Class 5-9), 5 (office), 6 (retail), 7a (car park), 7b (storage), 8 (laboratory/factory), 9a (health), 9b (assembly), 9c (aged care), 10a (shed), 10b (fence), 10c (swimming pool). Key sections: Section C — Fire resistance (FRL ratings in min/min/min: structural adequacy/integrity/insulation). Section D — Access and egress. Section E — Services and equipment. Section J — Energy efficiency (J1V3 verification method, NatHERS 7-star minimum residential). State amendments: each state/territory may amend NCC via local regulations.