Perth's Duplicate Image Problem: How the City Stacks Up Against Singapore, Amsterdam and Toronto

Perth's planning and property databases are quietly drowning in duplicate imagery. Across the City of Perth and Stirling council areas, development application portals are carrying thousands of repeated or near-identical photographs — the same renders of Applecross townhouses filed three times over, drone shots of Scarborough beachfront lots attached to unrelated Northbridge applications, stock facade images recycled across dozens of submissions on Beaufort Street alone. The problem has been accumulating for years, but a push by the Western Australian Planning Commission to digitise its full archive ahead of the Metronet corridor rezoning process has thrown the scale of the duplication into sharp relief.

The timing matters. WA's housing pipeline is under extraordinary pressure. The state government has committed to accelerating approvals to meet demand driven partly by immigration and AUKUS-related workforce migration into the Greater Perth area. Cluttered, duplicated visual records slow assessments, create legal ambiguity around which image reflects the approved design, and in a handful of cases have contributed to planning disputes that have stalled projects by months. Cleaning up the record is not administrative housekeeping — it has direct consequences for the delivery of housing stock the city badly needs.

What Perth Is Doing — And What It Isn't

The City of Perth launched a data remediation project through its Smart City Office in late 2025, targeting its Objective ECM document management system. The project involves automated hash-matching to flag identical image files and a secondary manual review tier for near-duplicates. The Stirling council area, which has some of the highest development application volumes in the metropolitan region, has not yet announced a parallel program, according to publicly available council minutes through June 2026. The Western Australian Planning Commission has flagged image-quality standards as part of its broader ePlanning reform work, but no dedicated deduplication timeline has been published on the Commission's website as of this week.

Compare that with Singapore's Urban Redevelopment Authority, which completed a two-year image deduplication sweep of its Integrated Land Information Service in 2024, using perceptual hashing combined with a machine-learning classifier trained on local building typologies. Amsterdam's municipal planning department embedded automated duplicate detection directly into its omgevingsloket submission portal in 2023, meaning duplicates are rejected at the point of upload rather than cleaned up after the fact. Toronto's City Planning division adopted a similar upstream approach through its Amanda permitting platform, reducing duplicate image rates in its database from an estimated 34 percent to under 6 percent within 18 months of implementation, according to a case study published by the Canadian Urban Institute in March 2025.

The Gap Is Measurable, But Closeable

Perth is not starting from scratch. The City of Perth's Smart City Office work is real and ongoing. But the city is operating reactively — cleaning up what already exists — rather than preventing duplication at source, which is what Singapore, Amsterdam and Toronto now do. The difference in ambition is significant when you consider that the Metronet rezoning process will generate an enormous new wave of development imagery across the Forrestfield–Airport Link corridor, the Yanchep rail extension precincts and the Thornlie–Cockburn Link catchment areas, all of which are entering active planning phases simultaneously.

For architects, developers and planning consultants lodging applications through the MyDevelopment portal, the practical advice is straightforward: name image files with project-specific identifiers rather than camera-generated defaults like IMG_4521.jpg, avoid re-attaching images from previous applications unless specifically required, and check the WAPC's ePlanning guidance notes — updated in April 2026 — for current file-naming conventions. Submissions that comply with those conventions are processed faster and are less likely to be flagged for manual review.

The Western Australian Planning Commission's ePlanning reform is scheduled for its next public consultation round in the third quarter of 2026. If upstream duplicate detection is not on the agenda for that round, it probably should be. Perth has the benefit of watching three comparable cities solve this problem already. The solutions exist. The question is whether the state's planning machinery moves quickly enough to apply them before the next wave of applications arrives.