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

Sydney's local councils are sitting on a sprawling mess of duplicate digital imagery — aerial photographs, planning application scans, heritage documentation photos — that is clogging storage systems, inflating IT budgets and, in several documented cases, causing confusion during development assessment. The problem is not unique to Sydney, but how this city is tackling it compared to peers in London, Singapore and New York reveals both a genuine lag and some quiet innovation happening in Western Sydney.

The scale of the problem matters right now for a specific reason: New South Wales is processing more development applications than at almost any point in the state's history, driven by the Minns government's housing acceleration agenda and the wave of rezoning decisions flowing through councils from Blacktown to Bayside. Every one of those applications generates image files — site photos, elevation renders, heritage impact statements full of scanned pictures. When those files get duplicated across council servers, assessment officers waste time, storage costs climb, and version control becomes a legal liability.

What Sydney's Councils Are Actually Doing

The City of Parramatta Council, which processes some of the highest volumes of development applications in metropolitan Sydney, began a structured deduplication audit of its planning image database in late 2025, working with NSW Department of Planning systems under the state's ePlanning platform. The audit was tied directly to the council's migration toward the state-mandated NSW Planning Portal, which as of mid-2026 handles the bulk of lodgement for councils across the metropolitan area. Inner West Council, covering suburbs from Marrickville to Balmain, has been running a parallel process focused specifically on heritage register photography, where duplicate images of the same terrace houses or industrial buildings had accumulated across multiple internal filing systems over roughly two decades.

Neither council has publicised specific cost figures for the exercise, and requests for comment from council communications teams were not returned before deadline. What is publicly documented through the NSW Audit Office's 2024-25 report on local government IT infrastructure is that duplicate data management was flagged as a systemic risk across the sector, with the report noting inconsistent record-keeping practices among metropolitan councils as a recurring finding.

Singapore's Urban Redevelopment Authority dealt with a structurally similar problem between 2021 and 2023, when it consolidated its GIS imagery archive under a unified deduplication protocol as part of the city-state's broader Smart Nation push. The result, according to URA's published annual report for 2023, was a reduction in active storage footprint across planning image libraries. London's planning system, run across 33 borough councils, has taken a more fragmented approach — the Greater London Authority's London Development Database maintains some central oversight, but deduplication remains largely a borough-by-borough responsibility, with predictably uneven results. New York City's Department of City Planning migrated to a cloud-based document management system in 2022 that includes automated hash-checking to flag duplicate image uploads at the point of lodgement, effectively preventing the problem from accumulating rather than trying to clean it up retroactively.

The Tech Gap — and Where Sydney Has an Advantage

Sydney's most promising approach mirrors New York's preventive logic. The NSW Planning Portal, built and maintained by the Department of Planning, Housing and Infrastructure, has the technical architecture to add upload-stage deduplication checks. Whether that capability is activated is a policy and procurement decision, not an engineering barrier. In that sense, Sydney is closer to a scalable fix than London's fragmented borough structure would allow.

The practical stakes are highest in growth corridors. Along the Merrylands-to-Westmead stretch of the Cumberland local government area, and across the Aerotropolis development zone around Badgerys Creek, the volume of planning imagery being generated monthly has surged. Getting image management right in those precincts is not a bureaucratic nicety — it directly affects how quickly assessment panels can verify site conditions and how reliably heritage constraints can be applied.

Councils still running their own legacy document management systems, rather than fully integrating with the state's ePlanning infrastructure, face the steepest climb. The practical advice from IT governance specialists who work in the local government sector is consistent: deduplication is most cost-effective when built into the intake process, not applied retrospectively to archives that have been accumulating for years. Sydney still has time to get ahead of the curve. Not much, but some.