Sydney's Duplicate Photos Problem Lags Behind London, Singapore, Toronto

Sydney's real estate and government records systems are carrying thousands of duplicate property images — the same photograph filed under multiple addresses, strata lots or development applications — and the agencies tasked with fixing the problem are working from different playbooks, or in some cases, no playbook at all.

The issue has sharpened this year because of two converging pressures: the state government's push to digitise planning records across all 128 NSW councils ahead of a 2027 compliance deadline, and the explosion in AI-assisted property listing tools that ingest council photo databases and reproduce errors at scale. What begins as a mislabelled JPEG in a Blacktown development application can end up contaminating listings on commercial portals, confusing buyers and, in the worst cases, appearing in valuations used by lenders.

What Sydney Is — and Isn't — Doing

The NSW Department of Planning and Environment has been running its ePlanning spatial viewer since 2019, and the platform now holds records for more than 2.4 million properties across the state, according to the department's own published documentation. The problem is that the viewer was not built with image deduplication in mind. Photos attached to development applications are stored as static files; there is no automated check to flag when the same image has been uploaded under two or more lot numbers.

City of Sydney Council and the City of Parramatta Council have both piloted separate internal auditing processes. Parramatta's team, working out of its Civic Place headquarters on Darcy Street, began a manual review of DA-linked images in late 2024 as part of a broader digital records overhaul. City of Sydney, which manages one of the densest concentrations of strata titles in the country — particularly around Green Square and Waterloo, where tower construction has generated layered and often duplicated photo records — has been trialling automated hash-matching software to identify identical files. Neither council has released results publicly.

Domain Group and REA Group, the two dominant listing platforms, both say they use proprietary image-matching tools to remove duplicates on the consumer-facing side, but neither has disclosed error rates or the volume of records corrected in any given period. The gap is in the upstream data: what comes out of council and state systems before it ever reaches a portal.

How Other Cities Are Handling It

London's experience is instructive. The UK's HM Land Registry completed a phased image standardisation program across its digital register between 2022 and 2024, using a centralised deduplication layer that flags images with more than a 90 percent pixel-match similarity before they are attached to any title record. The registry reported in its 2024-25 annual report that the program had reduced duplicate image incidents by what it described as a significant margin, though specific figures were not made public in the summary document.

Singapore's Urban Redevelopment Authority runs a single national planning portal — GoBusiness — that requires all submitted development images to pass an automated uniqueness check at the point of upload. The system was built that way from the ground up in 2021, which gives Singapore a structural advantage Sydney does not have: it never accumulated a legacy backlog.

Toronto is the closer comparison. Its 44 municipal planning divisions were consolidated after 2021 amalgamation reforms, and the city spent roughly three years between 2022 and 2025 running a retroactive image audit across pre-amalgamation records. The process was expensive and slow, and city officials publicly acknowledged that a portion of older duplicates were simply archived rather than resolved.

Sydney's situation looks more like Toronto's than Singapore's — a city dealing with inherited complexity rather than one that had the luxury of designing clean systems from the start. The difference is that Toronto had a single point of political accountability for the cleanup. In NSW, responsibility is divided between state planning, the Land Registry Services (which was privatised in 2017 and is now operated by Advara), and individual councils.

For property buyers and developers, the practical advice from conveyancers is to cross-reference any DA photo with the physical address on the certificate of title and to request a fresh title search — rather than relying on portal images — before exchanging contracts. The NSW Law Society has flagged image-linked discrepancies in its conveyancing guidance notes, though it has not put a number on how frequently they cause disputes. The 2027 deadline for council digitisation compliance may finally force a coordinated fix. Until then, the patchwork holds.