Sydney's Duplicate Image Problem: How the City Stacks Up Against London, Singapore and New York

Sydney's government databases contain tens of thousands of duplicate property and infrastructure images — redundant photograph records clogging planning portals, asset management systems and land-title registries — and the agencies responsible are moving more slowly to clean them up than counterparts in Singapore and London, according to public records and published technology procurement documents reviewed this week.

The issue sits at the intersection of two pressures bearing down on the NSW Labor government simultaneously: a housing approval backlog concentrated across Western Sydney that demands faster digital processing, and an ageing government IT stack that was built before cloud-based deduplication tools were widely available. Every duplicate image entry attached to a development application adds friction to a workflow that councils and developers are already pushing the state to streamline.

What Sydney Is Actually Doing

The NSW Department of Planning's ePlanning portal, which handles development applications for councils from Penrith to Sutherland Shire, has been the primary site of remediation efforts. The department's digital services division ran a deduplication audit across the portal's document store in the second half of 2025, targeting image attachments to applications lodged between 2018 and 2023. Transport for NSW has a parallel program inside its asset-management platform — covering roughly 17,000 kilometres of road and rail infrastructure — where photographic condition records had accumulated significant duplication after multiple system migrations, including the absorption of legacy records from the former Roads and Maritime Services.

In the inner west, Cumberland Council began its own local-level cleanup in March 2026, working through a backlog of duplicate streetscape photos tied to heritage-listing assessments around Auburn and Berala. The council engaged a Sydney-based data services firm through a procurement process documented on the NSW eTendering platform. The contract scope, published in February 2026, referenced more than 400,000 image records requiring classification and deduplication across the council's geographic information system.

The practical stakes are not abstract. Duplicate images attached to a single DA can trigger automated validation errors, sending applications back to the queue. For a city where the median house price in Greater Sydney remained above $1.4 million through the first quarter of 2026, anything that delays housing approvals draws sharp attention from industry groups and the state opposition alike.

How Other Cities Have Handled It

Singapore is the clearest comparator. The Urban Redevelopment Authority there completed a system-wide image deduplication sweep of its Integrated Land Information Service — known as INLIS — in 2023, using hash-based matching algorithms that reduced its property photograph repository by approximately 34 percent. The project cost around SGD 2.1 million and took 14 months, according to the authority's 2023–24 annual report. London's planning data infrastructure, managed through the Greater London Authority's Planning London Datahub, adopted automated deduplication as a standard ingestion rule in 2022 — meaning no new duplicate images enter the system at the point of upload rather than requiring periodic retrospective cleaning.

New York City's Department of City Planning moved in a different direction, outsourcing image verification to a third-party cloud provider under a contract that began in fiscal year 2024. The approach reduced staff hours spent on manual record reconciliation, though New York's planning data environment is structurally different from Sydney's because it sits atop a consolidated five-borough system rather than a federated council structure.

Sydney's federated model — with 33 councils plus state agencies maintaining parallel systems — is the root complication. Unlike Singapore's single national authority or London's unified GLA layer, NSW has no single point of image ingestion, which means deduplication must happen at multiple levels simultaneously or not at all.

What comes next depends largely on the timeline for the NSW Government's GovConnect NSW data-sharing framework, which is designed to create common data standards across agencies. Technology procurement documents published on the NSW Digital Restart Fund portal indicate that image-handling specifications are scheduled for finalisation by the fourth quarter of 2026. If those standards include mandatory deduplication rules at the upload stage — the approach London took four years ago — the retrospective cleaning underway at Cumberland Council and inside the ePlanning portal would become a one-time fix rather than a recurring task. Until then, developers filing applications through Parramatta Square's Service NSW hub or digital portals serving the Blacktown local government area are navigating a system that, by its own audit findings, still contains records it shouldn't.