Wollongong Leads Mid-Sized Industrial Cities on Tackling Duplicate Image Sprawl in Planning Approvals

Wollongong City Council's development assessment team confirmed this week it has overhauled its document intake protocols to systematically flag and remove duplicate images from planning submissions — a change that has cut average DA processing times for straightforward residential applications by a measurable margin since the new system went live in March 2026.

The issue sounds mundane. It is not. Across Australia and comparable post-industrial cities in the United Kingdom, Germany and South Korea, planning departments are drowning in bloated PDF submissions where the same architectural photograph, site plan or heritage image appears dozens of times across multiple attachments. The problem is acute right now because digital submission portals introduced during the COVID-19 era — designed for speed — offered no file-deduplication tools, and applicants exploited maximum file counts rather than file-size caps to push through material.

What Wollongong Is Actually Doing

The council's planning portal, which serves the greater Illawarra region from its Crown Street offices in the Wollongong CBD, now runs an automated hash-check on every image file uploaded to a DA. If two images share an identical file signature, the system flags the submission and returns it to the applicant before it reaches an assessor's desk. That alone has reduced the average page count of a submitted DA by roughly 18 percent since March, according to the council's internal quarterly reporting cited at the May 2026 Ordinary Council Meeting minutes, which are publicly available on the council's website.

The University of Wollongong's Smart Infrastructure Facility on Northfields Avenue has been a quiet collaborator. Researchers there have been stress-testing the hash-check algorithm against large-scale commercial submissions — the kind typically lodged for Port Kembla industrial precinct developments, where BlueScope Steel's green steel transition work is generating a spike in environmental impact assessment documents. Those assessments run to thousands of pages and have historically been among the worst offenders for duplicated imagery.

Residents lodging DAs for knock-down rebuilds in suburbs like Fairy Meadow and Figtree are also feeling the effect. Before March, a standard single-dwelling submission might include the same shadow diagram image attached six or seven times across separate document categories. Assessors would flag the duplication manually — slow work that added days to the queue.

How Wollongong Compares Globally

The benchmark comparison is instructive. Sheffield City Council in the United Kingdom, which shares Wollongong's post-steel-industry identity, began a similar deduplication project in late 2024 but has not yet automated the process — Sheffield's planning team still relies on manual review checklists. Pohang in South Korea, home to POSCO's steelworks and often cited alongside Wollongong in industrial-transition research, has no formal deduplication policy in place as of this year. Duisburg, Germany's Ruhr Valley steel city, implemented a commercial document management product across its building authority in 2023, though that system targets duplicate documents broadly rather than images specifically.

Wollongong's approach is narrower and cheaper. Rather than purchasing an enterprise content management platform — costs for which in comparable Australian councils have run to $400,000 or more for initial licensing — the council built its hash-check function as an extension to its existing TechOne planning module. The development cost has not been publicly disclosed, but council officers described it at the May meeting as a minor capital works item rather than a major IT procurement.

The timing matters for reasons beyond bureaucratic efficiency. The Illawarra Shoalhaven Joint Organisation, which coordinates regional planning priorities across five councils, is pushing for faster DA turnarounds to support housing supply targets set under the NSW government's housing delivery program. Every week shaved from an average assessment cycle has real consequences for a region where median house prices in Wollongong's northern suburbs have remained above $900,000 through the first half of 2026.

Applicants lodging new DAs through the NSW Planning Portal for properties in the Wollongong local government area should ensure their image files are uniquely named and not duplicated across attachment categories before submission — the system will now bounce submissions automatically, adding delay rather than removing it. The council's duty planner at the Crown Street counter can advise on compliant formatting on any business day.