Sources and method

How each rule is built

1. We read the official text: the Brussels Housing Code and its ordinances, the Region’s legal brochure and model letters, Statbel data.
2. We encode the rule and test it with literal expected values (dates, amounts).
3. Every result returns its steps, its sources and the rule version used.
4. Before publication, the rule is reviewed against the sources by someone who did not write it.
5. Where the texts leave a point open, we record our reading in a decision log and apply it consistently.
6. When a rule changes, it gets a new version; the old one is kept so past results can be explained.

Rule versions

Health index data

Statbel health index in our data: base 2025 up to October 2026; base 2013 from January 2025. Updated every month when Statbel publishes.

All sources