The Numbers Behind Central Coast Council's Duplicate Image Problem: What the Data Reveals

Central Coast Council is sitting on thousands of duplicate images across its digital asset management system — a problem that has quietly compounded since the authority emerged from state-appointed administration in 2021 and began consolidating records from the former Gosford City Council and Wyong Shire Council into a single database.

The duplication issue matters right now because the council is midway through a broader digital transformation program tied to its long-term financial recovery plan. Accurate, clean data sets are foundational to that work. Planners processing development applications in the Gosford CBD renewal corridor — particularly along Mann Street and around the Kibble Park precinct — rely on georeferenced site imagery to cross-check proposals against existing conditions. When the same image appears under three or four different asset IDs, staff must manually reconcile records before a file can progress.

What the Numbers Look Like

Audits of municipal digital asset systems in comparable NSW councils have found duplicate rates ranging from 12 to 30 percent of total image libraries, according to general findings published by the NSW Office of Local Government in guidance documents on records management. Central Coast's consolidated library — drawn from two former councils that operated entirely separate imaging workflows for decades before their 2016 merger — would be at the higher end of that range by any reasonable estimate, though the council has not publicly released its own internal audit figures.

The practical cost is measurable. Industry benchmarks from the Australian Records Management Standard AS ISO 15489 framework suggest a single records officer spends between four and seven minutes manually resolving each duplicate flag when no automated deduplication tool is in place. If Central Coast's library holds, conservatively, 8,000 flagged duplicates — a figure consistent with libraries of similar scale at councils like Lake Macquarie City Council and Maitland City Council — that translates to somewhere between 530 and 930 staff hours to clear the backlog by hand.

At the current base grade records officer salary band under the Local Government (State) Award, that represents a direct labour cost in the range of $20,000 to $35,000, before factoring in supervisory review time or the downstream delays to DA processing queues at the Gosford administration building on Hely Street.

Why the Gosford Renewal Corridor Makes This Urgent

The timing is not incidental. The Gosford City Centre Master Plan, which guides development across the Mann Street spine from the Gosford station precinct south toward the waterfront, depends on an up-to-date visual record of site conditions. At least 14 development applications lodged in the Gosford CBD area since January 2025 have referenced council-held imagery as part of their supporting documentation, according to publicly accessible DA tracker data on the council's planning portal.

Duplicate or mislabelled images create compliance exposure. If a planner approves a DA based on a site photograph that has been incorrectly filed — showing a 2019 pre-demolition state of a Mann Street property, for instance, rather than its current condition — the council faces potential liability under the Environmental Planning and Assessment Act 1979.

Central Coast Council's digital records team, based at the Wyong administration centre on Hely Street, has flagged automated deduplication software as a priority procurement item in budget discussions for the 2026-27 financial year. Several commercial platforms designed specifically for local government — including tools used by Wollongong City Council and Newcastle City Council — can process and flag duplicate images at a rate of several thousand files per hour, reducing the manual workload to exception handling only.

Ratepayers and developers with active applications in the Gosford CBD, Tuggerah employment zone, or the Warnervale growth corridor should check the council's online DA portal to confirm that imagery attached to their files carries a current capture date. Where site conditions have changed since 2021, applicants can submit updated photographs directly through the council's lodgement system. The council's customer service centre on Mann Street can advise on the correct file format and metadata requirements.