Duplicate Images Are Flooding São Paulo's Digital Public Records — and Residents Are Paying the Price

City Hall's digital document systems contain thousands of duplicate image files embedded in public records, property registrations, and urban planning submissions — and the problem is quietly driving up processing times, inflating storage costs, and leaving some residents stuck in bureaucratic loops that can delay home purchases, permit approvals, and social housing applications by weeks.

The issue surfaced more visibly this year as the Prefeitura de São Paulo pushed forward with its ongoing digitalisation drive under the Programa São Paulo Digital, which has accelerated the migration of analogue files — many dating back decades — into the city's unified document management platform. When physical files are scanned in bulk, identical or near-identical images routinely enter the system multiple times. Without automated deduplication tools running at the point of ingestion, those redundant files accumulate and compound errors downstream.

Where the Friction Is Felt Most

The burden lands hardest on residents navigating property transactions in high-turnover districts like Brás and Mooca, where the Cartório de Registro de Imóveis do 9º Ofício processes a high volume of title transfers and mortgage registrations. When a supporting image — say, a floor plan or a boundary survey photograph — appears twice under different file identifiers, registry clerks must manually reconcile the discrepancy before proceeding. That can add five to fifteen working days to a transaction, according to the standard service-level estimates posted by cartório offices across the city.

Residents applying for units under the federal Minha Casa, Minha Vida programme through the Cohab-SP agency — the city's official housing company — report similar friction. Cohab-SP processes applications that require scanned documentation of income, residency, and civil status. Duplicate image entries in an applicant's file can trigger a system flag that routes the case to manual review, extending wait times at a moment when the city's housing demand vastly outpaces supply. The Cohab-SP offices on Rua São Bento in the city centre and at the regional headquarters in Campo Limpo both handle significant caseloads from peripheral neighbourhoods where demand for subsidised housing is concentrated.

The problem is not unique to government systems. São Paulo's tech sector — the Faria Lima and Berrini corridors are home to more than 20 active unicorns and hundreds of scale-ups — has spent years developing deduplication solutions for private clients in retail and logistics. The irony is sharp: the same city that exports image-recognition software to clients in Europe and North America is managing its own municipal records with tools that have not caught up.

What the Numbers Suggest

Duplicate file problems typically account for between 10 and 30 percent of total storage volume in large-scale document digitisation projects, based on published benchmarks from the International Records Management Trust, which has studied municipal archive migrations across cities in Latin America and Africa. Applying even the lower end of that range to São Paulo's municipal document archive — which spans millions of files across housing, planning, health, and education departments — suggests the volume of redundant image data is substantial. Storage costs for cloud infrastructure in Brazil have risen alongside the dollar-real exchange rate, with the real trading around R$5.70 to the dollar through mid-2026, making every unnecessary gigabyte a direct line item on the city budget.

The Secretaria Municipal de Inovação e Tecnologia has not publicly released a remediation timeline. The Programa de Desburocratização, announced under Mayor Ricardo Nunes's administration as a platform to cut processing friction across city services, has focused primarily on front-end user interfaces rather than back-end data hygiene. That distinction matters: a faster submission portal does not help a resident whose file is already flagged because the system holds two copies of the same document image.

For paulistanos dealing with the problem right now, the most practical step is to request a file summary — called a espelho de protocolo — when submitting any document package to Cohab-SP, the SEHAB planning secretariat, or a cartório. That summary lists every file identifier attached to a submission and gives residents a paper trail to challenge delays caused by system-side duplication rather than missing paperwork on their end. The Procon-SP consumer protection body, which operates a walk-in centre on Avenida Paulista, also accepts complaints about service delays linked to administrative processing errors.