The numbers racket: Melbourne's duplicate image problem is costing councils and developers real money

Thousands of duplicate images are clogging Melbourne's planning and property systems, adding processing time, inflating storage costs and slowing approvals at a moment when the city's housing reform agenda can least afford it. An audit of digital asset management practices across Victorian local government, completed in the first half of 2026, found that duplicate image files accounted for a significant share of redundant data held on council servers — a problem compounding as density reforms push more development applications through online portals.

The issue sounds mundane. It isn't. Melbourne's housing density debate has put planning departments under sustained pressure since the Allan government's Planning Policy Framework amendments came into force. The City of Melbourne, the City of Yarra and a string of inner-suburban councils are each processing higher volumes of digital submissions than at any point in the previous decade. When duplicate or broken images sit inside those submissions, staff must manually identify, flag and request replacement files — a process that adds days to already stretched assessment timelines.

What the data actually shows

Digital asset management firm Assetic, which holds contracts with multiple Victorian councils, published benchmark figures in March 2026 showing that between 18 and 23 percent of images stored across local government content systems were either exact duplicates or near-identical variants uploaded at different times by different users. That figure climbed above 30 percent in systems that had not undergone a structured audit since before 2021. Storage costs for a mid-sized council running unmanaged image libraries were running at roughly $4,200 per terabyte annually on legacy infrastructure — a number that compounds quickly when redundant files are never purged.

At the state level, Land Use Victoria's Surveyor-General data portal — which sits on Spring Street and handles title imagery, cadastral maps and heritage overlays — flagged internal duplication as a known workflow issue in its 2025–26 annual service review. The review did not publish a specific duplication rate but noted that manual image replacement requests had increased compared with the prior financial year.

Property listings are a parallel headache. REA Group's realcommercial.com.au and Domain both flag duplicate listing images in their submission guidelines, but the enforcement is largely automated and imperfect. Agents operating out of Fitzroy, Brunswick and Southbank report that re-listed properties — units that fall through at auction and are re-advertised within 30 days — frequently carry over image sets from the earlier campaign, including photos that no longer reflect the property's current condition or staging.

The local cost in time and dollars

At the City of Port Phillip, which covers South Melbourne and St Kilda and processed more than 4,800 planning applications in the 2024–25 financial year, a staff member in the development services team estimated — in a council newsletter published in May 2026 — that image-related resubmission requests added an average of 1.3 working days to affected files. The newsletter did not attach a dollar figure to that lag, but at Victorian public sector enterprise agreement rates for a planning officer, the arithmetic is straightforward.

The State Library of Victoria's digital collections team has dealt with this longer than most. Its Digitisation Program, run out of the La Trobe Street building, began a deduplication sweep of its image archive in February 2025 after storage costs on its AWS-hosted collections environment rose beyond budgeted parameters. By the end of that financial year, the library had removed more than 140,000 redundant image files from its internal catalogue, freeing measurable server capacity without losing a single unique record.

For councils and developers trying to stay ahead of Melbourne's housing pipeline, the practical fix is neither expensive nor complicated. Structured file-naming conventions at the point of upload, mandatory image hashing on submission portals and scheduled quarterly audits are the three interventions most commonly recommended by digital records specialists. Several Melbourne councils are currently evaluating vendor proposals for automated deduplication tools, with decisions expected before the end of the 2026 calendar year. Those that move quickly will have a processing advantage when the next round of density applications arrives — and given Melbourne's growth trajectory, that round is not far off.