Brussels Confronts Duplicate Image Problem in Public Art Registry: Key Decisions Loom This Autumn

Brussels' regional cultural administration is heading toward a decision point that could reshape how the city documents and manages its vast public art collection. At the centre of the dispute: a persistent duplicate-image problem inside the digital registry maintained by urban.brussels, the planning and heritage agency based on Rue du Progrès, that has caused dozens of artworks — from the painted façades of Saint-Gilles to bronze statues in the Cinquantenaire park — to appear twice or more in official records, distorting conservation budgets and complicating permit applications for building owners across the capital.

The problem matters now because urban.brussels is scheduled to migrate its current database to a new Flemish-and-French bilingual open-data platform before the end of the first quarter of 2027. If the duplicate entries are not resolved before that migration, officials familiar with the process have warned that the errors will be baked into the new system — potentially for another decade. A working group convened in May 2026 has been meeting monthly at the Bozar centre on Rue Ravenstein to agree on deduplication protocols, but no binding standard has yet been adopted.

What the Duplicates Actually Cost

The practical consequences are not abstract. Conservation grants allocated through the Fonds bruxellois de Gestion des Déchets and the separate Beliris federal-regional contract programme are partly calculated on the basis of registered asset counts. When an artwork appears twice, it can attract two separate conservation-assessment fees, each typically running between €800 and €2,400 depending on the scale of the work. Urban heritage professionals in the sector have estimated — though no official audit figure has been published — that the Brussels inventory currently holds somewhere between 180 and 240 duplicate image entries, a range wide enough to suggest the full scope of the problem remains unmapped.

The issue is not unique to Brussels. Amsterdam's Monumenten & Archeologie bureau completed a comparable deduplication exercise for its canal-house photographic archive in 2023, ultimately removing around 14 percent of duplicate entries from a corpus of roughly 90,000 records. That benchmark has been circulating among Brussels cultural administrators as a reference point for what a realistic clean-up operation might look like in terms of both scale and timeline.

Three Decisions That Will Define the Outcome

The working group, which includes representatives from the Musées royaux d'Art et d'Histoire, the Commune de Saint-Gilles cultural department and at least two university digital-humanities teams, faces three distinct choices before its September 2026 deadline.

First: whether to use automated image-matching software — tools already piloted on a subset of 3,000 photographs from the Ixelles municipal archive — or to require human review for every flagged duplicate. Automation is faster and cheaper, but it carries a meaningful error rate when distinguishing, say, a restored mural from an earlier documented version of the same wall.

Second: whether duplicate entries should be merged into single records or simply flagged with a status tag and left as parallel entries. Merging is cleaner for grant calculations but risks erasing metadata about how an artwork's appearance has changed over time — a detail that conservation specialists at the Institut royal du Patrimoine artistique consider invaluable.

Third, and most politically charged: who holds final sign-off authority. Urban.brussels, the 19 individual communes and the federal Beliris programme all contribute data to the shared registry, and none of them has formally conceded editorial control to the others. The outcome of that governance argument will determine whether the deduplication project runs on a unified timeline or fractures into 19-plus parallel efforts.

The next formal review session is set for September 11, 2026, when the working group is expected to present a recommendation to the Brussels Capital Region's cabinet secretary for heritage. Building owners along the Chaussée de Charleroi and elsewhere who have pending permit applications tied to heritage-listed artworks are watching the calendar closely. A decision delayed past October risks pushing the database migration, and with it any resolution of the duplicate problem, well into 2028.