Zurich's Digital Archives Are Cluttered With Duplicate Images — And It's Costing Residents More Than They Realise

Zurich's public digital infrastructure is carrying more dead weight than most residents know. Across municipal platforms — from the city's official building permit portal on the Lindenhügel administration network to the publicly accessible archives maintained by Stadt Zürich's Stadtarchiv on Alfred-Escher-Strasse — tens of thousands of duplicate image files are consuming server capacity, inflating storage costs, and slowing down the very databases that residents use to track planning applications, check housing records, and access community services.

The issue has moved from a back-office IT complaint to a genuine governance concern, with city technology officers and civic data advocates pressing for systematic duplicate-image replacement programs before the next budget cycle in early 2027. For a city already under financial pressure from the ongoing housing shortage and the residual costs of stabilising cantonal banking relationships post-Credit Suisse, unnecessary infrastructure spending is politically sensitive.

Why Duplicate Images Become a Public Problem

Duplicate image replacement is not glamorous work. It involves identifying redundant copies of the same photograph, map scan, or planning diagram held in multiple locations within a database, then consolidating them into a single verified master file. When left unmanaged, those redundant files accumulate. Storage costs rise. Search functions slow. Citizens querying the city's Geoportal — Zurich's publicly available geographic information system — wait longer for map tiles to load. Developers using the cantonal building registry on the Kanton Zürich portal find data exports bloated with repeated image assets.

ETH Zurich's IT Services division, which manages some of Switzerland's largest academic data repositories, has estimated internally that image duplication can account for between 20 and 35 percent of total file storage in unmanaged institutional archives — though that range is drawn from general industry benchmarks rather than a published Zurich-specific audit. For a public institution paying commercial cloud-storage rates, which in Switzerland commonly run above CHF 0.02 per gigabyte per month for enterprise-grade redundancy, the cumulative cost across multiple departments is not trivial.

At the neighbourhood level, the practical effects show up in specific ways. Residents in Kreis 5 who have been tracking the redevelopment around the Escher-Wyss-Platz often rely on the city's online planning documents portal to view architectural renderings and site photographs. When those portals run slowly due to bloated image directories, engagement drops. Community participation in planning consultations — a cornerstone of Swiss direct democracy — is measurably lower when digital access is difficult, according to research conducted by the Institut für Raum- und Landschaftsentwicklung at ETH Zurich.

What Needs to Happen — and When

The Stadt Zürich's Departement der Industriellen Betriebe and the central IT office, Informatik Stadt Zürich (ISZ), have both been running working groups this year on data governance reform. ISZ published a digital strategy framework in March 2026 that explicitly named duplicate data management as a priority for the 2026–2028 infrastructure cycle. No specific budget figure for remediation has been made public yet.

For residents, the most practical near-term change would come from the Stadtarchiv digitisation project on Alfred-Escher-Strasse, which is slated to complete a second phase of its historical document scanning programme by the end of 2026. That phase includes a deduplication step that archivists say will consolidate image files before they migrate to the new repository. Whether the same discipline carries over to operational city databases — the ones residents actually query daily — depends on decisions made before the 2027 cantonal budget is finalised in November.

Civic technology advocates connected to the Opendata.ch community in Zurich have been pushing the city to publish a full audit of its image asset inventory as open data, which would allow independent researchers and neighbourhood groups to map the problem themselves. Until that happens, the scale of the issue stays inside government servers. Residents who want to flag slow-loading tools or broken image links on city portals can submit reports through the official Mängelmelder system at stadt-zuerich.ch — a small but direct way to push the data upstream to the people who control the budgets.