Reading a PLU like an engine: emprise au sol, gabarit, height

PLACEHOLDER — editorial to replace. This note will explain how the published PLU is read as rules: footprint coverage (emprise au sol), envelope (gabarit) and height limits, with worked examples.

It will show why the same inputs must always produce the same buildable answer, and how architect validation sits on top of the deterministic layer.

The published version will cite the planning documents behind every number.