Copenhagen's Housing Portal Plagued by Duplicate Property Images — and Residents Are Paying the Price

Duplicate images appearing across multiple property listings on Boligportalen, the municipal housing registry used by tens of thousands of Copenhagen residents, are causing widespread confusion among flat-hunters across the city — and housing advocates say the problem has gone unaddressed long enough to constitute a genuine consumer issue.

The core problem is straightforward: photographs uploaded by landlords or housing associations to shared listing databases are being indexed multiple times, so a single image of, say, a kitchen in a Nørrebro two-bedroom can appear attached to three or four separate addresses. Prospective tenants looking at a flat on Jagtvej believe they are seeing the actual property. They may not be.

This matters more in Copenhagen than almost anywhere else in northern Europe right now. The city's rental vacancy rate has hovered near historic lows, and competition for affordable housing — particularly in inner-city neighbourhoods like Vesterbro and Østerbro — is fierce. When a listing goes live, applicants often have less than 48 hours to make a decision. Misleading photographs do not just waste time; they push residents into viewings and, in some cases, deposits, based on false impressions of a property's size, finish or location.

Where the Problem Bites Hardest

Two organisations have been fielding resident complaints with particular frequency. Lejernes Landsorganisation, the national tenants' union with a busy Copenhagen office on Reventlowsgade, has received a growing number of inquiries from people who discovered after signing a contract that the flat they thought they had seen online bore little resemblance to the images shown. Separately, the cooperative housing association Bo-Vita, which manages properties across Amager and parts of Valby, acknowledged in its spring 2026 newsletter that image metadata errors had caused cross-contamination of listings in its digital catalogue — though the organisation did not specify how many units were affected.

The technical root cause lies in how image assets are handled when landlords update or re-list a property. Copenhagen's municipal Boligportalen pulls photographs from a shared content delivery infrastructure. When an image file is uploaded without a unique property-specific identifier — a process that happens manually, and inconsistently — the system's deduplication logic can fail, attaching the same image to multiple current listings simultaneously. The fix, according to digital infrastructure specialists, is not complex. It requires implementing persistent image-to-address binding at the point of upload, a standard practice in commercial real estate platforms such as Boliga.dk, which serves the owner-occupier market.

Boliga.dk introduced mandatory unique-image tagging in January 2025 after its own duplicate problem drew criticism from real estate agents operating in the Frederiksberg and Gentofte markets. The rental sector, which is governed differently and relies more heavily on municipal and cooperative housing systems, has not moved at the same pace.

What Residents Can Do Right Now

Until the system is corrected, residents have practical options. Lejernes Landsorganisation advises anyone entering a rental process to request a written image declaration from the landlord — a one-page confirmation that all photographs correspond to the specific address being let. This is not legally required in Denmark, but landlords cannot lawfully refuse to provide accurate property information under the terms of the Danish Rent Act, Lejeloven, which was substantially revised in 2022.

Flat-hunters should also cross-reference listings against Kortforsyningen, the national mapping service, which provides street-level imagery updated as recently as 2025 for most of central Copenhagen. A quick comparison between a listing photograph and Kortforsyningen's exterior view can flag obvious mismatches before a viewing is even booked.

Copenhagen's Teknik- og Miljøforvaltningen, the city's technical and environmental administration, is expected to publish updated guidance on digital property listing standards later this autumn as part of a broader housing transparency initiative. Whether that guidance will include binding requirements for image verification on rental platforms remains unclear. What is clear is that for the roughly 62,000 households currently on Copenhagen's social housing waiting lists — a figure published by the city administration in its 2025 annual housing report — every misleading listing is one more obstacle in an already punishing search.