Question juridique clé
Whether the neighbours had standing to appeal the building permit decision
Solution extraite
Yes. Given the short distance, visibility of the alterations, and likely traffic/parking effects, they were directly affected and had a legally protected interest.
Motifs extraits
Neighbour standing under Art. 89 LTF is generally recognized for direct neighbours or when special emissions are likely. Here the project was about ten metres away, visible from the appellants' property, and could increase traffic and parking pressure. The cantonal court could not dismiss the appeal as interest-general litigation.