How Barcelona's Housing Platforms Got Buried in Duplicate Listings — and Why the City Is Only Now Cleaning House

Barcelona's municipal housing registry logged more than 10,000 active short-term rental listings across major platforms at the peak of the city's tourism boom in 2023 — a figure city technicians now say was artificially inflated by duplicate image entries that made the same apartment appear under multiple listings, sometimes across several platforms simultaneously. The scale of that duplication problem is the direct reason why Ajuntament de Barcelona's current enforcement framework, launched under Mayor Jaume Collboni's administration, has focused so heavily on image verification and digital cross-referencing rather than simple licence counts.

The issue matters now because the city's short-term rental moratorium — which in November 2024 let the licences for roughly 10,101 tourist apartments expire without renewal — created a database vacuum. Operators whose licences lapsed scrambled to relist properties under altered photographs or borrowed images from active listings, flooding platforms like Airbnb and Booking.com with visual duplicates that made enforcement counts unreliable. Collboni's housing team has been working since early 2025 to establish a clean baseline, and that process has proved far messier than officials anticipated.

How the Duplication Problem Built Up Over a Decade

The roots go back to roughly 2014 and 2015, when short-term rental listings in the Eixample and Gràcia districts began multiplying faster than the city's inspection capacity. Operators discovered early that reusing a single set of interior photographs — often a generic bright-kitchen, white-walls package — across multiple listings on different platforms produced more bookings with minimal additional effort. Because no centralised image-matching system existed, the same photograph of a flat on Carrer del Consell de Cent could appear under three different titles, two different prices and two different host accounts simultaneously.

The Sindicat de Llogateres, the Barcelona-based tenant union that has campaigned against tourist apartment proliferation in working-class neighbourhoods including Poblenou and Sant Antoni, flagged the duplication pattern in a 2022 report that argued official listing counts were overstating supply. Their analysis suggested that removing duplicates would reduce the apparent number of available tourist apartments by a significant margin — though the precise figure was disputed at the time by platform representatives.

City inspectors from the Agència de l'Habitatge de Catalunya, the regional housing agency based in the Carrer de Aragó offices, did not have the legal tools to compel platforms to share image metadata until a 2023 amendment to Catalonia's tourism regulations. That amendment required platforms operating in Catalonia to submit monthly data including primary listing photographs to the agency. It took until mid-2024 for the technical infrastructure to run automated perceptual hash comparisons — the image-fingerprinting method that detects visually identical photographs even when file names or metadata have been altered.

What the Clean-Up Looks Like on the Ground

By January 2026, the Agència had flagged more than 2,300 listings for duplicate image review across the Barcelona metropolitan area. Of those, inspectors confirmed several hundred as outright copies. Some were traced to the same operator running parallel accounts; others turned out to be legitimate listings where a new host had purchased a flat and simply reused the previous owner's photographs without realising those images remained live on a defunct account.

The practical effect on streets like Carrer de la Princesa in El Born has been visible. Several apartments that showed as bookable on platforms through spring 2025 went dark after image-matching audits linked them to expired licences. Residents in those buildings reported — anecdotally, to local community groups — that the noise and turnover dropped noticeably within weeks.

For prospective renters and landlords trying to navigate what comes next, the takeaway is structural. The Ajuntament has indicated it intends to maintain the image-verification requirement as a permanent feature of the licensing renewal process, meaning any future tourist rental licence application in Barcelona will require original, time-stamped photographs submitted directly to the municipal registry rather than platform-hosted images. Applications are currently being processed through the Oficina d'Habitatge network, with the Sant Martí district office on Rambla del Poblenou handling the highest volume of new inquiries. The window to submit corrected listings without penalty was set to close at the end of June 2026, which means any operator still carrying a flagged duplicate entry as of this week is already in formal breach.