Duplicate Images, Real Costs: What Officials and Experts Are Saying About the Central Coast's Planning Portal Problem

Development application files lodged through NSW Planning Portal are turning up with duplicate images attached to property records across the Central Coast, creating confusion for builders, prospective buyers and council assessment staff trying to process a backlog that already stretches into the hundreds. The problem is not new, but pressure to resolve it has sharpened as Central Coast Council pushes to accelerate Gosford CBD renewal projects and process a surge in housing applications driven by Sydney commuters priced out of the city.

The timing matters. Central Coast Council only exited formal administration in 2021 after a financial crisis that cost ratepayers tens of millions of dollars and left a legacy of understaffed planning departments. The council is still rebuilding internal capacity, and data-quality issues that might be minor irritants elsewhere carry heavier consequences here, where assessment teams are smaller and error-correction takes longer.

What the Duplication Actually Causes

At its most basic, the duplicate-image problem means a single planning file can carry two, three or more copies of the same site photograph, survey plan or shadow diagram. That inflates file sizes, slows the NSW Planning Portal's document viewer, and — critically — can cause automated document-sorting tools to misread a submission as incomplete. An incomplete flag can push an application to the back of the assessment queue, adding weeks to a timeline that the Building Industry Association of NSW has previously described as already among the longest in the state.

For developments near Mann Street in Gosford or along the Terrigal Drive commercial strip in Terrigal, where mixed-use projects are actively in train, a multi-week delay can mean holding costs on construction finance that, at current commercial rates, run to several thousand dollars per week on a mid-sized project. The Central Coast's median house price sat at roughly $830,000 as of early 2026, according to CoreLogic's March quarter data, meaning the viability margins on new builds are tight enough that process delays carry real financial weight.

Property lawyers and building certifiers who regularly work in the Gosford and Wyong local government areas have noted the problem in industry forums, though no formal complaint mechanism directed at this specific fault has been publicly lodged with the Department of Planning, Housing and Infrastructure. The department administers the NSW Planning Portal, which went through a major redevelopment in 2023 aimed at streamlining DA submissions statewide.

What a Fix Would Require

Technology specialists familiar with planning portal architecture say the duplication typically originates at the upload stage, when applicants or their agents submit document packages using automated batch-upload tools that fail to check for existing file hashes before attaching a new copy. Resolving it requires either a server-side deduplication layer — standard in enterprise document management systems — or stricter front-end validation that rejects duplicate filenames within the same application record.

Central Coast Council's own DA tracking dashboard, accessible via the council's website, does not currently flag duplicate attachments as a distinct error type. That means assessment officers identify the problem manually, a step that consumes time the planning team does not have in abundance. The council's 2025–26 operational plan set a target of determining 82 percent of DAs within statutory timeframes, a goal that depends on clean, correctly structured submissions arriving through the portal.

Residents tracking applications for projects near Kibble Park in Gosford or the Laycock Street Theatre precinct can check submission status through the NSW Planning Portal's public register. If a file appears stalled at the "documentation review" stage for more than ten business days, planning advocates suggest lodging a written inquiry directly to the council's Development and Regulation directorate, citing the application number and requesting confirmation that all attachments have been received without duplication errors. The Department of Planning, Housing and Infrastructure also operates a technical support line for portal-related faults, separate from the assessment process itself. Getting the data right at lodgement — one clean copy of each document, clearly labelled — remains the single most effective step applicants can take while a systemic fix works its way through the system.