How Perth's property listings got buried under duplicate photos — and why it took years to fix

Perth's real estate portals have carried a quiet but expensive problem for the better part of five years: thousands of property listings cluttered with duplicate photographs — the same shot of a Cottesloe limestone facade appearing three times in sequence, or identical kitchen images stacked side by side in a Baldivis display-home ad. The issue has finally pushed agencies and platform operators toward coordinated image-deduplication systems, but the road to this point is longer and messier than most buyers scrolling through realestate.com.au would suspect.

The stakes are real. Western Australia's residential property market has been running at extraordinary volume. The Real Estate Institute of Western Australia has previously reported that Perth median house prices surged past $700,000 during 2024-25, a market driven in part by Metronet-corridor demand and the wave of interstate and overseas migrants settling near Stirling, Joondalup and the Armadale line. With that volume came pressure on listing agents to upload fast, and fast uploads, particularly through third-party content management platforms, reliably generated duplicate imagery at scale.

Where the problem started

The mechanics are straightforward. Most Perth agencies use one of a handful of content management systems to push listing data — photos included — to aggregator portals. When the same image is exported at slightly different resolutions, renamed by an automated file system, or uploaded twice across a Sunday afternoon by two staff members working the same listing, portals historically lacked robust hash-matching logic to catch the collision. The image went live, duplicated, often multiple times.

The pandemic acceleration made it worse. Between 2020 and 2022, WA's border closure created a peculiar local dynamic: demand was surging from Queenslanders and Victorians making enquiries sight-unseen while Perth vendors were listing faster than ever. Agencies like those clustered along St Georges Terrace and in the Osborne Park industrial strip — where a concentration of boutique property marketing firms operate — were pushing listing volumes they hadn't managed before. Manual quality-control on image uploads dropped away. Duplicate photos embedded themselves in the data pipeline.

The State Government's own agencies were not immune. Landgate, which manages Western Australia's official property data registry from its Midland headquarters, processes title and spatial data but does not police portal imagery directly. That gap — between official property records and what commercial listing platforms actually show — is where the duplication problem lived.

What the fix actually looks like

Perceptual hashing — a technique that generates a fingerprint for each image based on visual content rather than file metadata — is now the baseline standard being adopted by the major portals. It catches near-duplicate images even when filenames differ or minor crops have been applied. Domain and realestate.com.au both moved toward automated flagging systems, though the rollout across smaller, state-specific listing platforms has been slower and patchier.

For Perth agencies, the practical consequence of duplicate imagery has never just been aesthetic. Research published by property technology groups in 2024 consistently found that listings with cluttered or repetitive photo galleries recorded measurably lower click-through rates than comparable listings with clean, non-repeating image sets. Buyers lose trust in the listing's professionalism before they even read the price.

The Metronet corridor matters here specifically. As new estates open along the Yanchep rail extension and around Ellenbrook, agencies uploading display-home photography face a particular duplication trap: builders supply the same photography package to multiple lot listings, and without deduplication logic at the agency or portal level, buyers searching between Alkimos and Eglinton see the same image set recycled across dozens of listings for different lots on different streets.

The correction is underway. Agencies are now being asked by the major portals to submit images meeting minimum resolution and uniqueness standards before a listing is published rather than after. For property managers on tight weekend turnarounds across the northern suburbs, that workflow change is significant — but the alternative, a listing page that looks like a glitch, costs more in lost enquiries than the extra upload time. The infrastructure, finally, is catching up with the market it was supposed to serve.