How Wollongong's planning system got tangled in a duplicate image problem — and what it took to get here

Wollongong City Council's development assessment unit is confronting a backlog problem that has been building for the better part of a decade: hundreds of planning files lodged through the NSW Planning Portal contain duplicate, outdated or mismatched imagery that has made it harder for assessors to verify site conditions, cross-reference heritage overlays and confirm what is actually being built where.

The issue did not arrive suddenly. It is the cumulative result of three overlapping pressures — a surge in development applications through the Port Kembla and West Dapto growth corridors, the staged rollout of digital lodgement systems that were not always compatible with council's own GIS mapping layers, and a pandemic-era spike in DA volumes that left staff with little bandwidth to audit file quality.

How the pipeline got clogged

Port Kembla's rezoning activity accelerated significantly after 2021, when the state government designated the precinct as a priority renewable energy zone under the NSW Electricity Infrastructure Roadmap. That decision triggered a wave of industrial and infrastructure applications — from BlueScope Steel's green steel transition proposals to smaller ancillary development tied to the emerging hydrogen supply chain along Reeves Street and the Outer Harbour precinct. Each application required site photography, aerial imagery and shadow diagrams. Many applicants, working from the same base mapping data, submitted near-identical image sets. Council's electronic document management system had no automatic deduplication function at that point, so the repeated files embedded themselves across multiple reference folders.

The West Dapto release area compounded the problem from a different direction. The Dapto structure plan, which covers roughly 6,500 dwellings across suburbs including Kembla Grange and Horsley, generated steady DA volumes from 2019 onward. Aerial photography of the release area was updated by NSW Land Registry Services in stages, meaning some applicants submitted imagery that was already superseded by the time a planner opened the file. An assessor cross-checking a subdivision lot against a streetscape photograph could be looking at land that had changed materially in the eighteen months between image capture and assessment.

The University of Wollongong's Smart Infrastructure Facility published work in 2023 examining document integrity risks in automated planning systems, noting that image duplication and metadata drift were among the most common sources of factual error in digitised assessment workflows — a finding that has since been referenced in discussions at the Illawarra Shoalhaven Joint Organisation level about regional data standards.

What changed, and what still needs to

Wollongong City Council introduced a revised DA lodgement checklist in late 2024 that, for the first time, required applicants to timestamp and geolocate all submitted photographs and to certify that imagery was captured within 90 days of the lodgement date. The change applied to Category 1 and Category 2 applications, covering the bulk of residential and commercial DAs. Council's planning team also began a retrospective audit of high-value files lodged between July 2020 and June 2023 — a period that accounted for a significant proportion of the duplicate image instances identified in an internal quality review.

The audit is ongoing. Files tied to the Crown Street Mall precinct in the Wollongong CBD, where several mixed-use redevelopment proposals have been in assessment simultaneously, were flagged early because multiple applicants drew on the same licensed aerial base map from a single vendor, producing visually identical site context images despite referring to distinct parcels.

For homeowners and developers currently working through the DA system, the practical advice from planning practitioners in the region is consistent: engage a certifier or planning consultant who understands the new imagery certification requirements before lodging, particularly for sites in Port Kembla, Dapto and the northern Wollongong suburbs where overlay complexity is highest. Applications with complete, timestamped and geolocated imagery are moving through the queue faster than those requiring a request for additional information — a step that can add six to ten weeks to an already stretched assessment timeline.

The broader lesson from how Wollongong arrived at this point is straightforward: digital planning systems require active data hygiene, not just digitisation. The infrastructure was built. The maintenance protocols took longer to follow.