Barcelona's Rental Market Is Drowning in Duplicate Listings: Here Are the Numbers

At least one in five short-term rental listings active on major platforms in the Barcelona metropolitan area during the first quarter of 2026 was a duplicate image listing — the same apartment photographed identically and posted under two or more separate URLs, often at different price points. That figure, drawn from platform transparency reports filed with the Ajuntament de Barcelona under the city's 2023 short-term rental monitoring framework, is now at the centre of a quiet but significant dispute between housing researchers and platform operators over what the city's rental data actually shows.

The timing matters. Mayor Jaume Collboni's administration is midway through the most aggressive short-term rental crackdown in the city's history, having declined to renew roughly 10,000 tourist apartment licences when they expired in November 2028 — a policy set in motion by a 2023 court ruling that sided with the city. Analysts and tenant advocacy groups have long argued that without scrubbing duplicate entries, any statistics used to benchmark policy progress are effectively meaningless. If the same flat appears three times in an aggregated dataset, the apparent supply of rentals looks 200 percent higher than it really is.

What the Data Actually Shows — and Where It Comes From

The Institut Municipal d'Habitatge i Rehabilitació (IMHAB), the city body responsible for housing policy implementation, began cross-referencing listing image hashes against cadastral records in January 2026. Early results from the Eixample district — Barcelona's densest residential zone, where Carrer d'Enric Granados and Carrer del Consell de Cent are lined with mid-century apartment blocks increasingly contested between long-term tenants and tourist operators — showed that duplicate image matches accounted for an estimated 22 percent of active listings in the neighbourhood. In Gràcia, where the Mercat de l'Abaceria sits at the intersection of several streets heavily marketed to short-stay visitors, the figure was closer to 18 percent.

Researchers at the Universitat Pompeu Fabra's urban studies faculty have been independently scraping platform data since 2024. Without naming a specific unpublished figure, their working methodology — presented at a February 2026 seminar at the CCCB on Carrer de Montalegre — flags that duplicate removal consistently reduces apparent short-term supply by between 15 and 25 percent across central Barcelona postcodes. That gap is not academic. When the city's housing office calculates the ratio of tourist beds to residential units in a given neighbourhood — a ratio that triggers enforcement thresholds under the 2023 framework — inflated supply numbers can push a neighbourhood below the intervention threshold even when, in practice, it has already crossed it.

Rental prices tell a parallel story. The median monthly rent for an unfurnished 60-square-metre flat in the Eixample hit €1,470 in the first quarter of 2026, according to figures published by the Generalitat de Catalunya's housing secretariat. That is a 9 percent rise year-on-year. Meanwhile, the same secretariat's data shows the number of new long-term rental contracts signed in Barcelona fell 14 percent between 2024 and 2025 — a combination of owners exiting the long-term market, speculative holding, and, researchers argue, the statistical noise introduced by duplicate listings that makes available supply appear artificially robust to landlords anchoring their prices to platform comparables.

What Comes Next for Landlords, Tenants and the City

The Ajuntament is expected to publish revised methodology guidelines for housing data collection by the end of September 2026, according to the IMHAB's published work programme for the year. Those guidelines are likely to mandate perceptual hash deduplication — a computer vision technique that identifies visually near-identical images even when file metadata has been altered — as a standard step before any listing count enters a policy document.

For tenants searching for flats in Poblenou or Sant Antoni right now, the practical implication is blunt: the number of listings shown on a platform search is not the number of available apartments. Housing advisers at the Oficina de l'Habitatge on Carrer de Llull recommend cross-referencing any listing against the city's official tourist apartment licence register — publicly searchable at habitatge.barcelona — before signing anything or paying a deposit. The register shows whether a property holds a valid HUT (habitatge d'ús turístic) licence, which is legally incompatible with a standard long-term tenancy contract. In a market where the numbers lie, that verification step is the most useful data point a renter has.