What are the requirements for a building envelope in subdivision plans?

In Australian subdivision plans, a building envelope defines the permissible area for constructing a dwelling and associated structures on a lot. These envelopes are typically established to manage amenity impacts, protect environmental features, ensure adequate setbacks from boundaries, and maintain consistent streetscapes. Requirements specify maximum building footprints, heights, and distances from property lines, often reflecting bushfire attack level (BAL) assessments and local council planning overlays. Adherence ensures ordered development and minimises future planning disputes.