Sydney Councils and Developers Scramble to Purge Duplicate Images From Planning Portals This Week

Property data managers across greater Sydney spent much of this week running emergency audits after a wave of duplicate images surfaced across council planning portals and major real estate listing platforms, slowing application processing times and frustrating buyers trying to assess development sites in suburbs from Parramatta to Penrith.

The problem is not new, but pressure to fix it has sharpened. The NSW Department of Planning has been pushing councils toward fully digital lodgement workflows under the State's ePlanning platform, which went mandatory for most development applications earlier this year. When duplicate images pile up inside those systems — the same site photograph uploaded three, four, sometimes a dozen times by different consultants or automated feed tools — it bloats file sizes, flags applications for manual review and can stall assessments that councils are already under pressure to turn around quickly given the state's acute housing shortage.

Where the Problem Is Biting Hardest

Inner-west and western Sydney councils appear to be carrying the heaviest load. Cumberland Council, which covers Auburn, Merrylands and Granville, processes some of the highest volumes of medium-density DAs in the state. Blacktown City Council, covering a corridor that stretches toward the new Bradfield City Centre near the Western Sydney Airport, is dealing with a surge of subdivision and commercial applications that routinely arrive with duplicated image sets attached. Staff at both councils have been directed by their respective IT teams to flag repeat uploads at intake, according to council meeting agendas published this week — though neither council has publicly quantified the backlog.

On the private-sector side, real estate technology companies that syndicate listings to platforms including Domain and realestate.com.au have been grappling with the same issue at the consumer end. Automated photo feeds from agency management software can push the same image multiple times when a listing is edited, creating galleries with dozens of near-identical frames. For buyers researching off-the-plan apartments in precincts like Green Square or Tallawong — where new towers can have hundreds of units listed simultaneously — the visual clutter makes genuine comparison harder.

The trigger this week was partly technical. A software update rolled out on or around June 30 by at least one major listing syndication provider introduced a bug in its de-duplication logic, according to industry forum posts reviewed by The Daily Sydney. The result was a spike in duplicate image records visible across several platforms before a patch was issued. The episode re-opened a broader conversation about image governance that the real estate data sector has been slow to standardise.

What Good Practice Actually Looks Like

De-duplication is not a glamorous problem, but the mechanics matter. Most systems now use perceptual hashing — a technique that generates a fingerprint for each image based on pixel patterns rather than file names — to catch identical or near-identical uploads before they are stored. The challenge is threshold-setting: too strict, and legitimate variations like a daytime versus twilight shot of the same facade get wrongly flagged; too loose, and true duplicates slip through.

The NSW Government's Spatial Services division, based at its Bathurst offices and responsible for the state's land and property data infrastructure, has published guidance encouraging councils to adopt image-hashing protocols as part of their ePlanning integration. Implementation, however, remains patchy and uneven across the 128 councils in the state.

For developers and agents in Sydney right now, the practical advice is straightforward: audit your image libraries before the next lodgement cycle. Consultants working in high-volume precincts like the Parramatta CBD or along the Sydenham-to-Bankstown corridor — both currently subject to significant rezoning activity — should confirm that their document management software is not auto-generating duplicate attachments on every revision save. A clean image set at lodgement reduces the chance of an application being returned for administrative reasons, which in the current market can mean weeks of delay on a timeline already stretched tight. The councils, for their part, are expected to have updated intake checklists circulated to applicants by the end of July.