How Central Coast Handles Duplicate Image Problems in Its Planning Records — and How It Stacks Up Against Cities Worldwide

Central Coast Council has been working through a backlog of duplicated imagery in its digital planning and asset-management databases, a problem that has quietly compounded since the forced amalgamation of Gosford City Council and Wyong Shire Council in May 2016. The merger dumped two separate records systems onto one administration, and a decade later, duplicate images — ranging from flood-plain mapping photographs to heritage property shots used in development applications — are still surfacing in the council's document management platform.

The issue matters now because the council, which only exited financial administration in 2022 after a period of oversight by state-appointed administrators, is mid-way through a broader digital transformation program. Duplicated image files are not just a storage cost — they create version-control failures that can delay development applications, produce inconsistent data in flood-resilience planning, and slow down the Gosford CBD renewal process, where accurate heritage imaging underpins planning decisions on Mann Street and Kibble Park precinct proposals.

What the Local Effort Looks Like

The council's records team has been using deduplication software as part of its content management overhaul, a project tied to the Digital Transformation Roadmap flagged in the 2024–25 Operational Plan. Staff across the Gosford Administration Building and the Wyong corporate office have been reclassifying asset imagery — including aerial photography used by the Gosford CBD Revitalisation project and flood imagery linked to properties along Tuggerah Creek and Ourimbah Creek corridors. Neither the council nor its technology vendors have publicly released the volume of duplicate records identified, so a precise figure is not available. What is known, from the council's own budget documents, is that the records management and ICT component of the 2025–26 budget sits within a broader $14.7 million corporate services allocation.

The Central Coast's situation is not unusual by global standards, but the comparison is instructive. Auckland Council, which merged 8 legacy councils in 2010, published a 2023 audit finding it had eliminated roughly 2.3 million duplicate digital asset records from its Objective ECM platform over a three-year remediation project. The City of Edinburgh, working within Scotland's Local Government Digital Office framework, reduced duplicate planning images by an estimated 34 percent between 2021 and 2023, according to a report published by the Scottish Local Government Digital Office in March 2024. Both councils had longer post-merger runways and, critically, dedicated ring-fenced budgets for records remediation — something Central Coast's financial constraints during and after administration made difficult.

Why Gosford's Heritage Files Complicate the Task

The Gosford CBD renewal adds a specific wrinkle. Development applications on heritage-listed properties along Mann Street, Georgiana Terrace, and around the Central Coast Conservatorium of Music rely on photographic evidence that must be traceable to a specific inspection date. When duplicate images exist — sometimes with different metadata timestamps from the old Gosford City Council system and the post-merger platform — assessing officers must manually verify which image is authoritative. That manual verification step adds time to application assessments, according to the council's own service-delivery reporting framework, though no precise delay figure has been independently audited.

Comparable mid-size Australian councils that underwent forced amalgamations — including Queanbeyan-Palerang Regional Council, merged in 2016 — have faced similar backlogs. Queanbeyan-Palerang contracted a third-party records consultant in 2021 to resolve duplicated imagery in its mapping systems, a decision that cost the ratepayer roughly $180,000 over two financial years, according to that council's published budget supplements.

For Central Coast residents and developers, the practical advice is straightforward: when lodging a development application through the NSW Planning Portal for a property in flood-affected catchments — particularly around Toukley, Tuggerawong, or the Ourimbah Creek flats — attach fresh, date-stamped photographs rather than relying on council's existing image library. The council's DA guide, available at the Gosford and Wyong service centres, recommends this for any application where site conditions may have changed since 2019. The digital cleanup is ongoing. It will take time. In the meantime, applicants who do the extra step themselves are less likely to get caught in the backlog.