Soil Testing and Geotechnical Investigation in NSW 2026: Complete Site Classification, AS 2870 Compliance and Foundation Cost Guide Author: Franz Phan, Senior Planning Consultant, giantA Pty Ltd (15+ years experience in NSW residential and multi-unit development) Why Soil Testing Is the First Decision That Shapes Your Entire Build... Approval Process DA approval NSW Planning construction-costs nsw-planning soil-testing Aug 14, 2026