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

Sydney's local councils are sitting on a data mess that is costing time and money at a moment neither can be spared. Across the Greater Sydney region, council planning portals — including those run by the City of Sydney and Cumberland City Council — are carrying tens of thousands of duplicate property and site images embedded in development application records, a problem that database auditors and records management professionals say has compounded as digital lodgement volumes surged after 2020. The duplication slows search functions, inflates cloud storage costs and, in some cases, delays the automated matching that planning officers rely on when assessing DA submissions against site history.

The timing matters. NSW Labor is racing to meet housing targets set under the federal government's Housing Accord, with Premier Chris Minns describing the political challenge ahead as steep. Getting development approvals processed faster is not optional — it is central to the government's credibility on housing. Every administrative bottleneck in the pipeline, including something as unglamorous as duplicate image records, adds friction to a process that Sydney can ill afford to slow.

What Sydney Is Actually Doing

The NSW Department of Planning runs the NSW Planning Portal, which since its 2019 launch has become the centralised lodgement system for DAs across most of the state's 128 councils. Records management teams within several councils have begun using automated deduplication software to clean image libraries, with Parramatta City Council among those that publicly tendered for digital records management services in the 2024–25 financial year. The City of Sydney's property information team has also flagged image data integrity as part of its broader Geographic Information System refresh, which is linked to a Pyrmont and Ultimo precinct review running through 2026.

The approach being taken here — largely reactive, council-by-council, without a state-mandated standard — contrasts with what comparable cities have implemented. Amsterdam's municipal planning authority, the Gemeente Amsterdam, mandated a unified image metadata standard across all district offices in 2022, meaning duplicate detection runs automatically at the point of upload rather than requiring retrospective cleaning. Singapore's Urban Redevelopment Authority went further, integrating image hashing into its Corenet X digital submission system, which became compulsory for most building works from April 2024. Under that system, a submitted photograph is checked against the existing database before it is accepted, and duplicates are flagged to the applicant in real time.

London's Cautionary Example

London offers the closest cautionary comparison. The Greater London Authority does not control individual borough planning databases, meaning 33 London boroughs each manage their own image records — an arrangement that produced exactly the fragmented, duplication-prone environment Sydney's councils are now navigating. A 2023 review by the Planning Advisory Service in England found that storage and retrieval inefficiencies across borough planning departments were contributing to processing delays, though it stopped short of quantifying the exact cost attributable to image duplication specifically.

Sydney has roughly 40 councils across the greater metropolitan area. If even half carry average duplicate rates comparable to those identified in comparable mid-tier urban planning databases internationally — typically estimated at between 15 and 30 per cent of image records in legacy systems — the clean-up task is substantial. Cloud storage alone runs at meaningful cost: enterprise-grade government cloud storage in Australia is generally priced in the range of $25 to $40 per terabyte per month, and planning image libraries across a major council can run into multiple terabytes once historical DA records from the pre-portal era are included.

The NSW Government has not announced a state-wide deduplication mandate. The Planning Portal's technical roadmap, as published on the department's website, prioritises e-lodgement expansion and assessment workflow tools through 2026, with image library integrity listed as a future consideration rather than a current project milestone.

For applicants dealing with Councils from Blacktown to Bayside, the practical advice from records management professionals is straightforward: submit images with consistent file naming conventions, avoid resubmitting previously uploaded photographs under new filenames, and use the portal's document management fields correctly. It is not a fix — but until Sydney catches up with Singapore's upstream approach, it is the best available workaround.