'My flat was listed twice — I didn't know until a stranger knocked on my door': Barcelona renters speak out on duplicate property listings

A retired schoolteacher living on Carrer de Provença discovered last autumn that her ground-floor apartment was listed on two separate platforms simultaneously — at different prices, under different host names, neither of them her own. She had rented the flat to a subletter in 2024. The subletter had since moved out, but the listings remained active, attracting bookings she knew nothing about until a German couple appeared at her door with a printed confirmation and a rolling suitcase. The incident is not isolated.

Duplicate property listings — where a single address appears multiple times across platforms such as Airbnb, Booking.com, and Vrbo, either through error, deliberate arbitrage, or data scraping — have become a quiet but compounding problem for Barcelona's already strained rental market. With Mayor Jaume Collboni's administration pressing ahead with the most aggressive short-term rental restrictions in the city's history, including a hard deadline of November 2028 for the expiry of all existing tourist apartment licences in residential buildings, the listing chaos is arriving at exactly the wrong moment for residents trying to understand who controls their buildings.

The mechanics of the problem, street by street

In the Gràcia neighbourhood, where the density of tourist apartments along Carrer Gran de Gràcia and the streets fanning out toward Plaça del Diamant has long drawn complaints from residents' associations, community members say duplicate listings make enforcement almost impossible to follow. Barcelona's Habitatge Metropolità registry, which tracks licensed tourist accommodations, lists each property by a single licence number — but the same address can circulate under multiple listings using slightly altered photographs, reordered amenity descriptions, or different street-number formats. The effect is that one apartment effectively occupies multiple slots in platform search results, inflating the apparent supply of tourist accommodation while doing nothing to increase actual housing stock.

The Associació de Veïns de l'Eixample, one of the oldest neighbourhood associations in the city, has been fielding complaints from members since at least early 2025 about unlicensed or wrongly-listed properties in the grid streets between Passeig de Gràcia and Carrer de Muntaner. Members describe a pattern in which a single apartment generates two or three active bookings in overlapping dates, leading to confrontations in building entryways and unresolved complaints to platform customer service teams based outside Spain.

The city's current regulatory framework gives the Agència de l'Habitatge de Catalunya authority to investigate and fine operators of unlicensed or misrepresented tourist apartments. Fines for operating without a valid Habitatge Turístic Ús Turístic (HUT) licence can reach €90,000 under Catalan law, though enforcement has historically been uneven. In 2023, the Barcelona city council reported it had identified more than 10,000 tourist apartments operating outside the formal licence system — a figure that advocacy groups argued understated the true number because of exactly this kind of listing duplication.

What residents are being told to do — and what actually helps

The practical reality for residents who suspect a duplicate listing involves their building is slow and procedural. The first step, according to guidance published by the Oficina de l'Habitatge de Barcelona — which operates advice centres in neighbourhoods including Sant Martí and Nou Barris — is to cross-reference the platform listing against the public HUT licence registry maintained by the Agència de l'Habitatge. Each licensed apartment must display its registration number in its listing. An apartment appearing twice under different listing identifiers but the same address is a formal irregularity reportable directly to the Agència.

For landlords who believe their property has been listed without their knowledge — a scenario that residents' groups say occurs when a previous tenant or property manager retains platform account access — the advice is to contact the platform directly with proof of ownership, and simultaneously file a denuncia with the Mossos d'Esquadra's economic crimes unit. The process takes weeks, not days, and there is no automated cross-check between platform databases and the city's licence registry.

With the November 2028 licence expiry date approaching and the Collboni administration expected to publish updated enforcement protocols before the end of 2026, residents' groups are pushing for a mandatory, real-time link between platform listing databases and the Agència de l'Habitatge registry. Until that happens, the woman on Carrer de Provença is not the only one answering her door to confused tourists carrying someone else's booking confirmation.