How Canberra's Property Listings Ended Up Drowning in Duplicate Images — and What's Being Done About It

Canberra's property market has a clutter problem that has nothing to do with floor plans or body corporate fees. Duplicate images — the same photograph appearing multiple times across a single listing, or the same shot recycled across dozens of different properties — have accumulated across ACT real estate platforms to the point where agencies are now being forced to undertake systematic database cleanouts. The trigger is a combination of outdated file management practices, platform migrations carried out between 2019 and 2023, and a surge in listing volumes driven by Gungahlin and Belconnen subdivision releases.

The issue matters now because the ACT's rental vacancy rate has sat below two percent for much of the past three years, meaning prospective tenants and buyers are making fast decisions from online listings. A cluttered or duplicated photo gallery does more than annoy — it erodes trust in the listing, obscures genuine property features, and in some cases has caused automated valuation tools to misread property characteristics. Several local property management firms operating out of the Civic and Dickson corridors quietly flagged the issue to the Real Estate Institute of the ACT during the first half of this year.

How the Problem Built Up Over Half a Decade

The roots go back to a wave of platform migrations. Between roughly 2020 and 2022, a significant number of ACT-based agencies moved their listing management from legacy desktop software to cloud-based systems. When image libraries were transferred, metadata was frequently stripped, and deduplication logic that existed in the old systems didn't carry across. Photos were re-uploaded manually, sometimes multiple times, and the problem compounded with every new staff member who didn't know the original file had already been lodged.

Growth suburbs accelerated the scale. The Molonglo Valley and the broader Gungahlin corridor — including suburbs such as Throsby, Taylor and Jacka — saw hundreds of new off-the-plan properties enter the market simultaneously from 2021 onward. Developers supplied standardised image packages to multiple agencies, and the same hero shot of a kitchen splashback or a view toward Black Mountain Tower appeared in listings on realestate.com.au and Domain under different addresses and different agencies. No single platform caught it systematically because deduplication was not a native function in how listings were ingested.

The Australian Competition and Consumer Commission's Digital Platforms Services Inquiry, which has examined how real estate portals operate, noted in broader findings the importance of data accuracy in property search tools — though the specific issue of duplicate images was not the focus of that work. Locally, the ACT Planning directorate does not regulate listing image quality; that sits entirely within the commercial arrangements between agencies and platforms.

What a Replacement and Cleanup Process Actually Looks Like

Agencies undertaking duplicate image replacement are generally running a two-stage process. The first stage uses hash-matching software — tools that generate a unique fingerprint for each image file — to identify exact duplicates within a listing database. The second stage, harder and more expensive, involves near-duplicate detection, which catches the same photo cropped slightly differently or saved at a different resolution. Some firms are contracting this work to digital asset management specialists rather than handling it in-house.

The University of Canberra's Human-Centred Technology Research Centre has done adjacent work on image classification in Australian datasets, though no formal engagement between the centre and ACT real estate bodies has been publicly announced. ANU's College of Engineering, Computing and Cybernetics has postgraduate students working on computer vision problems that overlap with exactly this kind of deduplication challenge.

For renters and buyers navigating listings on sites like realestate.com.au, the practical advice from property advocates is straightforward: if a gallery shows what appear to be identical shots with slightly different file names, request a fresh photo set directly from the agent before committing to an inspection. For agencies still carrying legacy databases, the cost of running a hash-matching pass across a library of even 50,000 images is now low enough — commercial tools start under $200 a month for that volume — that there's little justification for further delay. The cleanout is unglamorous work, but the listings that come out the other side are materially better for it.