The Numbers Behind Sydney's Duplicate Image Problem: What the Data Actually Shows

More than 340,000 property and infrastructure records held across New South Wales government digital platforms contain at least one duplicate or replacement image flag, according to figures compiled by the NSW Department of Customer Service as part of its ongoing digital asset audit program. The audit, which covers council planning portals, Transport for NSW project documentation, and public housing databases, puts a hard number on what digital archivists have long described as a slow-moving administrative headache.

The timing matters. NSW is in the middle of the most intensive planning approval push in a generation. The Minns government has staked its political credibility on unlocking housing supply, particularly in growth corridors stretching from Parramatta to Penrith and down through the Macarthur region. Every duplicated image file that sits unresolved in a planning application can slow a development assessment, trigger a resubmission request, or simply inflate the cost of digital storage that taxpayers fund.

Where the Duplication Is Concentrated

The problem is not evenly distributed. The bulk of flagged records — roughly 60 per cent, based on the departmental figures — are concentrated in councils that have migrated legacy data onto the NSW Planning Portal since 2021. Cumberland Council and Liverpool City Council, both of which serve dense, fast-growing populations in Western Sydney, processed the highest volumes of planning applications in the 2024–25 financial year and consequently carry the largest backlogs of unresolved image metadata errors.

At the NSW Land Registry Services office on Hunter Street in the CBD, staff have been working through a separate but related issue: historical property title scans, some dating to the 1970s, that were digitised in batches and uploaded with duplicate file references. A targeted remediation program launched in March 2026 aims to clear approximately 18,000 of those records by December. The cost of that project alone has been pegged at $2.3 million in the department's public budget documentation.

Real estate is feeling it too. Domain and REA Group, the two dominant listing platforms operating across Sydney, have both flagged in their respective developer documentation that auto-import feeds from agency management software routinely push duplicate images — particularly floor plans and hero shots — at rates averaging one duplicate per every 14 uploaded files. For a high-turnover suburb like Blacktown, where more than 4,200 properties were listed for sale or rent in the 12 months to June 2026, that arithmetic produces thousands of redundant image files circulating through the system every year.

Why Replacement Rates Matter Beyond Tidiness

Storage costs are real and rising. Cloud hosting expenses for the NSW government's whole-of-government data infrastructure — administered through Service NSW and its contracted providers — exceeded $180 million in 2025–26, a figure disclosed in the state budget handed down in June. Digital asset officers estimate that between 8 and 12 per cent of that expenditure relates to redundant or duplicate file storage, though the department has not published a formal breakdown by file type.

For individual councils, the maths is more immediate. A medium-sized council like Ryde City Council typically processes 6,000 to 8,000 development application documents per year. Each application can contain dozens of images. When a replacement image is uploaded without the original being formally retired from the system, both files persist, both are indexed, and both consume resources every time a planning officer searches the portal. Multiply that across 128 councils in NSW and the aggregate redundancy is substantial.

The NSW Department of Customer Service has indicated it will publish a consolidated data quality report covering the 2025–26 audit cycle before the end of September 2026. Councils and state agencies have been asked to complete self-assessments using a standardised template distributed in May. For developers and real estate professionals, the practical advice from the Planning Portal's support documentation is blunt: manually review image metadata before submission, use unique file names rather than software-generated sequential numbers, and check for duplicate hashes before uploading batches of more than 20 files. It is unglamorous administrative work, but in a state trying to approve its way out of a housing crisis, unglamorous is exactly what the moment requires.