Duplicate Image Problem Puts Council's Digital Records Under Scrutiny: What Officials and Experts Are Saying

Central Coast Council is facing pressure to address a growing backlog of duplicate image files embedded in its property information and development application systems, with records management specialists warning the problem is more common — and more costly — than local governments typically acknowledge. The issue has come into focus as the Council, still rebuilding governance credibility after its 2020 financial administration period, pushes forward with a broader digital transformation agenda tied to the Gosford CBD renewal program.

At stake is the accuracy of planning and land-use records that underpin decisions affecting tens of thousands of residents across the region, from Tuggerah in the north to Woy Woy in the south. Duplicate scanned documents — where the same plan, certificate or site photo is stored multiple times under different file references — can cause delays in DA processing, create legal ambiguity around which version of a document is authoritative, and consume significant storage and staff time to reconcile.

Why This Matters Now

The timing is pointed. The NSW Government's Housing and Productivity Contribution framework, which took effect in July 2023, has increased the volume of development applications flowing through councils across the state. Central Coast, which processed more than 4,800 DAs in the 2024–25 financial year according to its annual report, is handling that load while simultaneously migrating legacy paper-based records into its Technology One enterprise platform. That migration, which began in earnest after the Council exited administration in late 2021, has not been without friction.

Records and information management professionals who work with NSW councils say the duplicate image problem is a predictable byproduct of bulk scanning programs that lack rigorous deduplication protocols at the point of ingestion. Without a named deduplication policy embedded in the scanning workflow, staff processing applications at the Gosford Customer Service Centre on Mann Street or at the Wyong office on Hely Street can inadvertently attach the same document multiple times, particularly when resubmissions arrive in paper and digital form simultaneously.

Central Coast Council's integrated planning and reporting documents identify the Technology One migration as a key workstream under its 2022–2026 Delivery Program. The program does not publicly specify a completion date for the deduplication component, and the Council has not released a standalone audit report on image data quality.

What a Clean-Up Actually Involves

Deduplication at council scale is not a simple file-delete exercise. Specialists describe a three-stage process: identification of candidate duplicates using hash-matching or metadata comparison tools; human review of flagged records to confirm which version is the master; and then archival or deletion of the redundant copies in compliance with the State Records Act 1998 (NSW) and the relevant General Retention and Disposal Authority for local government records.

That last point matters on the Central Coast particularly. Because some property files date to the pre-amalgamation era — before the former Gosford City Council and Wyong Shire Council merged in May 2016 — there are cases where duplicate images are not truly identical but rather represent scans of the same original document taken at different resolutions or under different file-naming conventions by the two legacy organisations. Treating those as simple duplicates and deleting one copy without review could remove metadata that has ongoing legal or heritage significance.

The Gosford CBD renewal precinct, where a number of older commercial properties on Donnison Street and Mann Street are subject to active rezoning proposals, is one area where document integrity is most operationally sensitive. Errors or gaps in the DA image record for a heritage-listed building, for example, can stall a development assessment for months.

For residents and developers, the practical advice from records management practitioners is straightforward: when lodging any new application, submit documents in PDF/A format — the archival standard — rather than standard PDF or JPEG, label files with the relevant lot and deposited plan number in the filename, and request written confirmation from Council that all attachments have been received and indexed correctly. That step alone, according to published guidance from the NSW Information and Privacy Commission, significantly reduces the chance a document ends up duplicated or misfiled during high-volume processing periods. Council's customer service team at the Mann Street office can provide a checklist on request.