Uccle: very good transparency, largest municipality by area

The largest municipality by area

Uccle is the largest municipality in the Brussels Region by area (22.9 km²) and the fifth by population (nearly 87,000 inhabitants). A residential and green municipality, it is governed by a renewed MR-DéFI + Ecolo-Groen coalition.

Transparency: 5 out of 6 criteria

Uccle achieves a very good score. The budget and council minutes (with dedicated archives) are published online, the council is broadcast via livestream on YouTube, the mandate registry is accessible, and the municipality runs a participatory budget of EUR 150,000 via the MonOpinion platform. Only the Open Data portal is missing.

Citizen participation: MonOpinion

Uccle uses the MonOpinion platform (based on Decidim) for its participatory budget of EUR 150,000, allowing citizens to propose and vote on improvement projects for the municipality.

Recent developments

The property tax (PRI) has been raised from 2,940 to 3,400 additional centimes. The PFAS contamination at the Sicli site (Chaussee de Neerstalle 430) remains a major issue: a 100-metre safety perimeter has been in place since September 2025 (see PFAS dossier). A collaboration project with the municipality of Linkebeek is under consideration.