Key legal question
Whether the federal appeal was admissible against the cantonal judgment as an interim decision under Article 93 BGG.
Extracted holding
The cantonal judgment was an interim decision, and neither Article 93(1)(a) nor Article 93(1)(b) BGG was satisfied.
Extracted reasoning
The judgment did not finally resolve all material building-law questions; the appellants could still challenge the new volume calculation later, and no irreparable harm or major saving of time/costs was shown.