MVHR and Airtightness in NSW BASIX 2026: A Builder's Guide to Mechanical Ventilation Compliance MVHR and Airtightness in NSW BASIX 2026: What Builders and Homeowners Need to Know By Franz Phan, Senior Planning Consultant, giantA Pty Ltd | 31 July 2026 Since 1 May 2026, the BASIX assessment tool ... BASIX Passive House Sustainable Building basix-certification basix-compliance energy efficiency energy-efficiency sustainable-architecture Jul 31, 2026