Duplicate Images on London's Planning Portal Are Blocking Residents From Objecting to Developments in Their Own Streets

Hundreds of planning applications lodged with London boroughs are displaying duplicate or mismatched images in the public-facing portal, according to complaints logged with multiple local authorities since January 2026. The fault — in which photographs, site drawings or elevation plans attached to one application appear duplicated or substituted under a separate listing — means residents reviewing proposals cannot be certain they are looking at the correct documents for their street.

The timing is particularly awkward. The Labour government's Planning and Infrastructure Bill, currently before Parliament, is intended to speed up development decisions and reduce the window for public objection. Community groups and legal advisers say that if the underlying document management systems are unreliable, compressing consultation timescales makes a bad situation worse. In a city where a single planning decision can alter the character of an entire block, the integrity of what residents actually see online is not a minor administrative footnote.

Where the Problem Is Hitting Hardest

Two areas have generated the most documented complaints so far this year. In Hackney, residents near the Dalston Lane corridor say they encountered duplicate elevation drawings when trying to scrutinise a mixed-use scheme near Ridley Road Market earlier this spring — an application that drew more than 140 individual objections before the images were corrected by the borough's planning team. In Southwark, the Elephant and Castle regeneration zone has seen at least three separate applications where supporting documents appeared cross-linked in the portal, according to correspondence shared with local ward councillors.

Tower Hamlets, which has one of the highest volumes of planning applications of any London borough, updated its own document submission guidelines in March 2026 partly in response to repeated resident complaints about mismatched files. The council told applicants that all image files must be individually labelled with a unique reference before upload — a requirement that had apparently not been enforced consistently before that point.

The root cause appears to sit at the intersection of how boroughs use the Planning Portal, the nationally operated submission platform maintained by a private company under contract to central government, and their own internal document management systems. When a large batch of applications is processed together, image files with near-identical metadata can be assigned to the wrong listing. Residents who do not already have access to physical site notices — or who live far enough from a proposal that they would not pass one — have no fallback.

What This Means for Ordinary Residents

The legal right to object to a planning application is only meaningful if residents can read the correct documents. Under the Town and Country Planning Act 1990, local authorities must make application materials publicly available, but the legislation was written long before digital portals existed and does not specify what happens when those portals serve up the wrong files.

Planning Aid England, the charitable arm of the Royal Town Planning Institute, has published guidance noting that residents who object based on documents later shown to be incorrect may find their submissions carry less weight at appeal. The organisation runs a free advice line — 0207 929 8400 — and its London casework team has seen a rise in contacts related to document discrepancies since the start of 2026.

The practical advice from planning lawyers is blunt: do not rely solely on what the portal shows. Cross-reference with the physical site notice, which boroughs are still legally required to post. Submit a formal request under the Local Government Transparency Code for the complete application file if anything looks inconsistent. And note the date — most London boroughs allow 21 days from the date of the site notice for written objections, not from the date you first discover the application online.

For Londoners in areas facing significant development pressure — Stratford, Old Oak Common, and the Nine Elms riverside stretch among them — the message is simple. Check the site notice on the lamppost. Then check the portal. If they do not match, contact your borough planning department in writing and keep a copy. Your ability to shape what gets built next door may depend on it.