Question juridique clé
Whether the use of an internal expert report from the cantonal building office violated the appellants' procedural rights or required an independent expert opinion.
Solution extraite
No violation was established; the internal report could be relied upon and no independent expert was required.
Motifs extraits
The prior involvement of the same official in an earlier, different and more extensive project did not by itself create impermissible bias. The appellants were informed of the report and allowed to comment; they knew the project and locality and could submit a meaningful statement without needing external expertise.