Berlin's Duplicate Image Problem: The Key Decisions That Will Shape the City's Digital Archives

Berlin's Senate Chancellery confirmed this week that a long-running audit of the city's public image repositories has uncovered tens of thousands of duplicate and mislabelled photographs stored across at least a dozen municipal departments, raising urgent questions about data governance, copyright liability, and the cost of remediation before the end of the 2026 budget cycle.

The problem matters now because Berlin's SPD-led coalition has committed to completing the migration of public records to a unified digital infrastructure by the first quarter of 2027. Duplicate images embedded in planning files, transport authority databases, and housing registers are not merely a storage nuisance — they carry real legal risk. When the same photograph appears under two different copyright classifications in two different systems, the city's exposure to licensing claims multiplies. With procurement teams across the Senate Departments for Urban Development and Housing already under scrutiny over spending controls, administrators cannot afford another liability surprise.

The audit covers repositories maintained by agencies including the Berliner Immobilienmanagement (BIM), which manages the city's property portfolio across districts from Marzahn-Hellersdorf to Tempelhof-Schöneberg, and the Berliner Stadtbibliothek on Breite Straße in Mitte, whose digitised historical collection runs to more than 1.2 million images. The BVG, Berlin's public transport operator, also maintains its own photo archive for infrastructure documentation — an archive that, according to documents reviewed for this report, has not been cross-referenced against Senate databases since at least 2021.

What the Audit Found — and What It Will Cost

Preliminary figures circulating inside the Senate Department for Digital Transformation suggest the deduplication process could affect upwards of 80,000 image files, though that number has not been officially confirmed. Licensing specialists familiar with municipal copyright frameworks place the cost of a full remediation project — covering identification, legal review, and re-cataloguing — at somewhere between €400,000 and €700,000, depending on whether the city contracts externally or deploys existing IT staff from the ITDZ Berlin, the state's central IT service provider based in Müllerstraße in Wedding.

The ITDZ Berlin has handled large-scale data consolidation projects before, most recently supporting the rollout of the city's unified citizen portal, berlin.de, which processed roughly 4.3 million user interactions in the first half of 2025. Whether its current capacity can absorb a parallel deduplication mandate without delaying other commitments is a question the Senate's digital committee is expected to take up when it meets again in September.

Three Decisions That Will Define the Outcome

Three choices will determine how this plays out over the next six months. First, the Senate must decide whether to treat deduplication as a central mandate or devolve responsibility to individual district administrations — a question with significant staffing implications for offices in Neukölln, Pankow, and Friedrichshain-Kreuzberg, where digital teams are already stretched.

Second, procurement rules must be clarified. If the project exceeds €500,000, it triggers EU public tender requirements under the Vergabeverordnung, which means the earliest an external contractor could begin substantive work is spring 2027 — after the coalition's own digital migration deadline. That timeline conflict has not been publicly acknowledged, but it is the detail administrators will have to confront head-on.

Third, and less visible but equally consequential, is the question of metadata standards. Berlin currently uses at least three incompatible tagging systems across its public archives. Without agreeing on a single standard before deduplication begins, the same files risk being flagged as duplicates incorrectly — or, worse, genuine duplicates being missed entirely. The Zuse Institute Berlin on Takustraße in Dahlem, which advises on data infrastructure for several federal agencies, has published guidance on interoperability frameworks that city officials could draw on without starting from scratch.

The Senate's digital committee meets again in September. By then, department heads will need a clear recommendation on contracting route and a confirmed budget line — or the 2027 migration target starts to slip before the new year even arrives.