Perth's War on Duplicate Images Online: How the City Stacks Up Against Singapore, Amsterdam and Toronto

Perth's metropolitan planning and real estate sectors are quietly confronting a problem that has ballooned alongside the city's population surge: thousands of duplicate images circulating across property listing platforms, government infrastructure databases and council asset registers, degrading data quality and in some cases misleading prospective buyers and tenants in one of Australia's tightest housing markets.

The issue has sharpened as immigration-driven demand has pushed Perth's rental vacancy rate to historic lows and compressed the window in which renters and buyers make decisions, often relying on digital imagery alone. A duplicated or recycled photograph of a Balga duplex appearing on three separate listings, or a stock image of a Cannington streetscape attached to a State Government infrastructure record, is no longer a trivial annoyance — it carries real consequences for people making six-figure financial decisions under pressure.

What Perth Is Actually Doing

The Real Estate Institute of Western Australia has flagged image data integrity as a growing concern within its member communications this year, and the Department of Planning, Lands and Heritage maintains the Shared Land Information Platform — known as SLIP — which aggregates spatial and photographic data across government agencies. SLIP has undergone several data-cleansing rounds since 2023, with duplicate asset imagery identified as one of the platform's persistent pain points, particularly for infrastructure records tied to Metronet corridor planning between Yanchep in the north and Byford in the south.

At the local government level, the City of Stirling — which covers suburbs from Scarborough through to Inglewood and manages one of the state's largest municipal asset portfolios — has been piloting automated image-deduplication tools within its corporate asset management system since late 2024. The City of Stirling declined to provide operational figures ahead of publication, but council tender documents published on the Tenders WA portal in March 2025 referenced software integration costs benchmarked against similar trials in New South Wales and Queensland councils.

Property listing platforms operating in the Perth market, including REIWA's own portal and national aggregators covering suburbs such as Victoria Park and Mount Lawley, rely heavily on vendor-uploaded photography. Without mandatory image metadata standards, the same photograph can legally appear on multiple simultaneous listings — a practice that consumer advocates have described as a transparency gap, though no formal regulatory prohibition exists at the state level as of July 2026.

How Perth Compares Globally

Singapore's Urban Redevelopment Authority mandated standardised photographic metadata requirements for all residential listings on its OneMap platform in 2022, with non-compliant listings automatically flagged and suspended after 48 hours. Amsterdam's municipal land registry, the Kadaster, implemented AI-assisted duplicate detection across its 4.2 million property records between 2021 and 2023, reducing identified duplicate imagery by roughly 87 percent over that period, according to Kadaster's published annual report. Toronto's city planning division embedded deduplication protocols into its open data portal refresh completed in January 2024.

Perth, by contrast, has no single mandated framework. The response is fragmented across local government areas, state agencies, and private listing platforms — a structure that reflects both the city's relatively recent digital infrastructure buildout and the WA Government's current budget focus on AUKUS-linked defence procurement and Metronet capital works. The state's 2025-26 budget allocated substantial capital to infrastructure and defence-adjacent industries, leaving digitisation of public data quality standards largely to agency discretion.

The practical gap matters. Perth's population crossed 2.3 million in 2025 and the housing construction pipeline, particularly along the Metronet corridors, is generating large volumes of new property imagery entering the market simultaneously — exactly the conditions under which duplicate images propagate fastest.

For renters and buyers navigating listings in suburbs like Alkimos or Ellenbrook right now, the most practical check remains cross-referencing images against Google Street View timestamps and requesting fresh photography from agents before making inspection decisions. For councils and state agencies, the Singapore and Amsterdam models offer a tested template. Whether WA's fragmented digital governance structure can consolidate around one is the question that planning and data officials will face as the city continues to grow into the back half of this decade.