ChatGPT generates convincing prose for scopes of work. But under Swiss construction law, legal precision is paramount: an invented norm clause or a misallocated phase in a specification creates severe uninsurable liability.
Phase Separation: Preliminary Design vs. Construction Design
Generic models cannot distinguish between Phase 31 (Vorprojekt), Phase 32 (Bauprojekt), and Phase 41 (Ausschreibung). Misallocated services cannot be legally billed under standard SIA fee schedules.
- ✓SIA 102 (Architecture) and SIA 103 (Structural Engineering) define distinct scopes and liabilities.
- ✓Every service item must reference the exact wording of the governing norm edition.
- ✓Uncited metrics must never enter a binding public offer without page-level verification.
Grounded AI vs. LLM Hallucination
Leistera operates read-only on official Swiss SIA editions. Every sentence carries exact page citations. If a passage does not exist, it flags 'not found' rather than hallucinating.