Wind class
Override a suburb
The computed class is provisional (AS 4055 method on building density, coast distance and ground slope; it does not establish obstruction heights, hill position or the mapped region boundary). A named entry here beats it for every address in the suburb; a person's entry on a job beats both. A suburb entry is not a substitute for site-specific shielding and topography review.
How the computed class works
AS 4055 via the Lysaght and Fielders guides: Region C to 50 km from the coast, then terrain category from how built-up the 500 m around the house is, shielding from the 100 m around it, and flat ground assumed. These thresholds decide the category from building counts per hectare.