'My whole life in a folder — and now it's gone': Berlin residents on the duplicate image crisis hitting housing applications

Dozens of Berlin renters are finding their housing applications rejected or suspended after a technical glitch in the Wohnungsmarktportal system — the city-linked digital platform used by many municipal housing associations — triggered an automated deletion of so-called duplicate images uploaded to tenant profiles. The purge, which appears to have begun in early June 2026, has stripped identification photos, proof-of-income scans and rental history documents from hundreds of active applications, according to multiple affected users who contacted The Daily Berlin.

The timing is brutal. Berlin's rental vacancy rate has been hovering below 1 percent for the better part of three years, and the SPD-led Senate is already under pressure over its proposed rent-cap extension under the Mietpreisbremse framework. Losing documents from an active application does not simply mean a delay — it can mean falling back to the bottom of a waiting list that, for some affordable units, stretches more than two years.

Residents in Neukölln and Mitte describe weeks of lost progress

Fatima K., a 34-year-old care worker living in a shared flat on Sonnenallee in Neukölln, said she had uploaded her documents three separate times over six weeks to a degewo online application portal, only to receive automated notices each time that her image files had been flagged and removed as duplicates. Degewo, one of the city's six municipal housing companies, manages roughly 75,000 apartments across Berlin. The Daily Berlin is not attributing specific statements to Fatima beyond what she confirmed directly in a written exchange, but her account reflects a pattern described by at least seven other renters reached for this report.

In Mitte, a teacher who asked to be identified only by his first name, Okan, said he had been waiting since March for a two-room flat near Leopoldplatz through the Stadtentwicklungsportal run under the Senatsverwaltung für Stadtentwicklung, Bauen und Wohnen. When the duplicate-image deletion hit his file in mid-June, he said he received no direct notification — he discovered the problem only when he logged back in to check his application status. By then, the apartment listing had been filled.

The issue appears to stem from a backend update to image-validation software intended to reduce storage load across the shared digital infrastructure used by several of Berlin's Wohnungsbaugesellschaften. The update, introduced without a public announcement, treats any file with an identical hash value — including legitimately re-uploaded documents — as a prohibited duplicate and removes it automatically. Tech advocates at the Digitale Gesellschaft e.V., a Berlin-based digital rights organisation, have flagged similar automated-deletion problems in other German administrative platforms, arguing that such systems require mandatory human-review checkpoints before any document is permanently removed from a citizen's file.

What affected renters can do now

The Berliner Mieterverein, the city's main tenant association with offices on Spittelmarkt, confirmed to The Daily Berlin that it has been fielding calls about housing-portal document problems since at least the second week of June. The association advises affected renters to request a formal written acknowledgement — a Bestätigungsschreiben — from the relevant housing company confirming the date of their original application, which can be used to argue that their queue position should be preserved. Membership in the Mieterverein costs €9 per month and includes access to legal advice.

For those applying through degewo, Gewobag or WBM, the three largest municipal landlords, the Senate housing administration has a dedicated complaints office at the Anlaufstelle Wohnraumversorgung Berlin on Württembergische Straße in Wilmersdorf. Applications can be submitted in person or via email, and the office is required under §7 of the Wohnraumversorgungsgesetz Berlin to respond within 30 working days.

Whether the software patch will be rolled back or modified is not yet confirmed. The Senatsverwaltung für Stadtentwicklung did not respond to a request for comment by publication time. Until the underlying system is fixed, renters affected by the purge are being advised to keep all original documents on hand, file on paper where the option exists, and log every upload with a timestamped screenshot — unglamorous advice for a city that has spent years promoting its digital-government credentials.