Milan's Duplicate Image Problem: Why Sloppy Digital Records Are Costing Residents Time and Money

Thousands of planning and property records held by the Comune di Milano contain duplicate or incorrectly matched images — a technical problem that sounds minor until it delays your building permit, inflates your IMU tax assessment, or sends a heritage protection notice to the wrong address. The issue, which municipal digitisation officers have been working to resolve since a 2024 archival migration project, is now drawing attention from condominium administrators and urban planning consultants across the city.

The timing matters. Milan is eighteen months into the run-up to the Milan-Cortina 2026 Winter Olympics, and infrastructure and renovation permits are moving at an accelerated pace through the Sportello Unico Edilizia, the city's unified building permit desk on Via Pirelli. When a submitted floor plan or façade photograph is duplicated in the system — linked to two separate cadastral codes, or attached to the wrong parcel entirely — the automated verification step flags an inconsistency and routes the file to manual review. That queue, according to documents circulated at a June 2026 session of the Commissione Urbanistica del Consiglio Comunale, currently runs between 34 and 47 working days.

Who Gets Hit Hardest

The burden falls unevenly. Large developers working on Porta Nuova Varesine or CityLife have dedicated legal teams who catch duplicate-image errors before submission. Smaller applicants — a family renovating a flat in Isola, a bar owner on Corso di Porta Ticinese applying for an outdoor terrace licence — typically discover the problem only after receiving a formal notice of sospensione del procedimento, the administrative pause that stops the clock on their application. Each pause can cost an applicant between €800 and €2,500 in additional technical and legal fees, depending on the complexity of the file.

The Associazione Nazionale Amministratori Condominiali e Immobiliari (ANACI), whose Lombardy chapter is headquartered in Milan, has flagged the problem to the Assessorato all'Urbanistica. Condominium administrators say they are encountering duplicate imagery most often in buildings constructed between 1955 and 1975 in outer-ring neighbourhoods such as Quarto Oggiaro and Gratosoglio, where original paper records were scanned in batches during a 2019–2021 digitisation drive funded partly by Regione Lombardia. Batch scanning produced identical file names for different properties, and those collisions persisted through subsequent database migrations.

The Politecnico di Milano's Department of Architecture and Urban Studies has been tracking digital cadastral accuracy as part of a broader Smart City research programme. While the department has not published final figures for Milan specifically, comparable European studies — including a 2023 audit of municipal GIS records in Turin published by the Istituto Nazionale di Statistica — found error rates of between 3.2 and 6.8 percent in scanned property image archives, with duplicates accounting for roughly half of all errors. Applied to Milan's roughly 730,000 cadastral parcels, even a conservative 3 percent rate suggests more than 20,000 potentially affected records.

What the City Is Doing — and What Residents Should Do Now

The Comune di Milano confirmed in a May 2026 notice on its institutional website that a deduplication protocol is being rolled out in phases through the Direzione Sistemi Informativi e Agenda Digitale. The first phase, covering the Municipio 2 and Municipio 7 districts, was scheduled for completion by 30 June 2026. Municipios 1, 3, 4, 5, 6, 8, and 9 are to follow before the end of the year, with a final validation audit planned for February 2027.

For residents who have an active application or are planning one, the practical advice from property professionals is straightforward. Before submitting any document to the Sportello Unico Edilizia, ask your geometra or architect to cross-check the image files attached to your cadastral record directly through the Agenzia delle Entrate's online Visura Catastale portal. If your property falls in the Municipio 2 zone — which covers Porta Venezia, Turro, and parts of Nolo — the deduplication work should already be complete, and a fresh visura should reflect corrected imagery. For everyone else, flagging a suspected duplicate proactively, before the submission, is faster than waiting for an automated rejection.

The Olympics deadline concentrates minds. With the torch relay scheduled to pass through Milan in late January 2027, the city has a hard political incentive to clear its permit backlog well before then. Whether the digital cleanup keeps pace with that calendar is the question administrators and residents on Via Pirelli will be watching closely over the next six months.