Acoustic Reports NSW DA 2026: When Councils Require Noise Assessments Near Roads, Rail and Mechanical Plant Answer first: Under the Transport and Infrastructure SEPP 2021, residential DAs near rail corridors or busy roads must meet internal LAeq targets — bedrooms 35 dB(A) (10 pm–7 am) and other habitable r... Approval Process Development Application NSW Planning acoustic-separation da-application due-diligence new-south-wales site-assessment 14 Sept 2026