Councils, architects and tech experts weigh in on Sydney's duplicate image problem plaguing development approvals

Planning officers at the City of Sydney and Cumberland Council are dealing with a growing administrative headache: development application files cluttered with duplicate, mislabelled or recycled property images that are delaying assessments and, in some cases, forcing re-submissions. The problem, which practitioners say has worsened alongside the surge in housing DA lodgements over the past 18 months, is now prompting calls for a mandatory image-replacement protocol across NSW local government.

The timing matters. The Minns Labor government has staked much of its political credibility on accelerating housing approvals across Greater Sydney, including fast-track rezoning corridors along the Metro West line from Parramatta to the Bays Precinct. Any friction inside the DA pipeline — however administrative it may appear — compounds delays that already have builders, developers and would-be homeowners stretched thin. The NSW Department of Planning, Housing and Infrastructure has been working since late 2024 to modernise the NSW Planning Portal, the state's centralised online lodgement system, and duplicate image management has emerged as one of the platform's persistent weak points.

Architects and drafting studios operating out of offices on Parramatta Road in Homebush and along George Street in the CBD say the problem is partly systemic and partly human. When applicants re-use photo sets from earlier DA versions without updating file names or metadata, the Planning Portal's document management layer can retain both the old and new images, creating version conflicts that assessors must manually resolve. The Australian Institute of Architects' NSW Chapter, based in Tusculum Street, Potts Point, has flagged the issue in submissions to the Department, recommending clearer file-naming conventions and automated duplicate detection before lodgement is finalised.

What the experts are recommending

Technology consultants who work with councils on planning software — including firms contracted to Blacktown City Council and Georges River Council — point to off-the-shelf document management tools already used in legal and health sectors that flag duplicate file hashes at the point of upload. The argument is straightforward: if a hospital system can stop a nurse uploading the same patient X-ray twice, a planning portal should be able to stop an applicant uploading the same street-elevation photo across three DA versions. Implementation would require the Department to update the portal's backend, a project that would sit alongside the broader portal upgrades budgeted in the 2025-26 NSW state budget.

Industry groups have also zeroed in on training. The Urban Development Institute of Australia NSW division, headquartered in Sydney's CBD, has been running workshops since March 2026 aimed at small drafting practices and owner-builder applicants — the cohort most likely to make inadvertent duplication errors. The sessions, held at their offices near Martin Place, cover correct image replacement procedures within the Planning Portal: deleting the superseded file entirely before uploading the replacement, rather than simply adding a new version alongside the old one. The distinction sounds trivial but, according to the Institute's guidance materials, it is the single most common source of duplication complaints from council assessment teams.

Councils pressing for a statewide fix

Cumberland Council, which covers Auburn, Merrylands and Granville and processed more than 3,400 DAs in the 2024-25 financial year, has formally written to the Department requesting a statewide standard on image file management as part of the portal's next update cycle. Northern Beaches Council has raised similar concerns, particularly around dual-occupancy applications in suburbs like Dee Why and Manly Vale where photo packages often run to dozens of images across multiple revisions.

The Department has indicated the next major Planning Portal release is scheduled for the fourth quarter of 2026, though no public commitment on duplicate-image detection has been made. In the meantime, councils are being advised to use existing document review checklists to catch the problem at pre-lodgement stage — a manual workaround that puts the burden back on already stretched assessment teams.

For applicants lodging now, the practical advice from planning lawyers and consultants is blunt: name every image file with a unique identifier that includes the DA number, the date, and the image version number before uploading anything to the portal. It adds ten minutes to a submission. It can save weeks off an assessment.