Barcelona's Short-Term Rental Crackdown Generates a Duplicate-Listing Problem the City Is Only Beginning to Measure

Barcelona's housing enforcement office confirmed this week that a systematic audit of short-term rental listings active on major platforms has identified a significant volume of duplicate image entries — the same apartment photographs appearing under multiple licence numbers, addresses or platform identities — complicating the city's effort to measure how many tourist flats genuinely exist within the municipal boundaries.

The timing matters. Mayor Jaume Collboni's administration is midway through the most aggressive short-term rental cull in the city's history, targeting the full elimination of the roughly 10,000 tourist apartment licences that were still active when his plan was announced in November 2023. That deadline falls in November 2028, but enforcement benchmarks are set for 2026, making accurate data about active listings a practical necessity, not a bureaucratic nicety. When one apartment appears as three separate listings — each carrying a different licence reference but sharing identical room photographs — the underlying count is wrong, and the policy looks either more or less successful than it is.

What the Numbers Actually Show

Digital rights and housing researchers working with the open-data project Inside Airbnb have flagged that Barcelona consistently ranks among Europe's most-listed cities, with active short-term rental counts that have fluctuated between roughly 15,000 and 18,000 entries depending on the scrape date and methodology. The gap between those figures and the municipality's own licence register — which caps legal tourist flats at a much lower ceiling across the city's ten districts — is partly explained by illegal listings, but analysts say a non-trivial share of the discrepancy traces back to duplicate image replacement: landlords who update a flagged or delisted entry by reposting the same property under fresh photographs or a marginally altered address string.

In the Eixample district, where rental pressure is most acute and where the Ajuntament de Barcelona has concentrated its inspection resources through the Housing Inspections Service (Servei d'Inspecció d'Habitatge), field officers have found that image-matching tools — the same perceptual hashing technology used by news photo agencies to detect stolen images — can flag suspected duplicates at a rate that manual review cannot match. The city's Smart City programme, coordinated from the Torre Diagonal Zero building in the 22@ innovation district, has been piloting one such tool since early 2026 in partnership with the Barcelona Institute of Technology for the Habitat (IBHB).

Across the platforms subject to the EU's Digital Services Act, which came into full effect for large platforms in February 2024, hosts are now required to provide a verifiable registration number before a listing goes live. Spain's Ley de Vivienda, enacted in May 2023, adds a national layer of obligations. Yet enforcement depends on cross-referencing platform data with municipal records, and that cross-referencing is only as good as the underlying image and metadata quality. Analysts at the IBHB estimate that between 8 and 12 percent of scraped Barcelona listings contain images that return a near-identical hash match to at least one other active listing — a range that, applied to a database of 16,000 entries, implies somewhere between 1,280 and 1,920 suspect duplicate records at any given moment.

What Happens Next for Landlords and Renters

The city's Housing Department is expected to publish updated audit methodology guidelines before the end of the third quarter of 2026, according to documents submitted to the Consell Municipal in June. Those guidelines will specify how image-hash evidence can be used in administrative proceedings against unlicensed operators — a step that housing advocates in the Gràcia and Sant Pere neighbourhoods have been pushing for since 2024, arguing that duplicate listings actively inflate apparent supply while real rental stock for residents continues to shrink.

For landlords still operating legally, the practical advice is straightforward: ensure that every active listing uses a unique, current set of photographs tied to a single verified licence number, and remove any dormant or paused entries before the city's automated scanning tools flag them as suspect. Reactivating an old listing with recycled images is increasingly likely to trigger a review. The Oficina de l'Habitatge de Barcelona, which has walk-in services at locations including Carrer de Llança 17 in the Esquerra de l'Eixample, can advise on compliance requirements. The window for voluntary correction is narrowing as the 2028 licence phase-out accelerates the pace of inspections across all ten districts.