London's Planning Portals Hit by Duplicate Image Crisis: What Happened This Week

London's overstretched planning system ran into a fresh headache this week as borough councils reported a significant rise in duplicate image submissions clogging digital planning portals, delaying decisions on hundreds of live applications. The problem, which came to a head between 30 June and 4 July, affected at least five boroughs including Tower Hamlets, Southwark, and Lewisham, where case officers were forced to manually review and replace incorrectly filed or repeated document images before applications could progress.

The timing matters. Keir Starmer's Labour government has made planning reform a centrepiece of its domestic agenda, with the Planning and Infrastructure Bill currently working through Parliament. Ministers have repeatedly cited slow local decision-making as a core obstacle to the 1.5 million new homes target set for this Parliament. A technical failure that grinds borough portals to a near-halt — even briefly — feeds directly into that political pressure.

What Went Wrong and Where

The root cause appears to be a software update pushed to the Uniform planning system — used by a number of London boroughs — late on Tuesday 30 June. Case officers at Southwark Council's offices on Tooley Street began flagging errors the following morning, with applicants reporting that uploaded elevation drawings and site photographs were appearing duplicated across unrelated applications. Lewisham's planning team, based at the Civic Suite on Catford Road, issued an internal notice on 2 July advising staff not to approve any document-dependent conditions until the image library could be audited. Tower Hamlets, which processes some of the highest application volumes in inner London, confirmed publicly on 3 July that around 140 live cases had been tagged for manual review.

The Greater London Authority's planning directorate, which oversees strategically significant applications above certain thresholds, said its own system — running on a separate platform — was unaffected. That matters because major schemes in Nine Elms, Barking Riverside, and Old Oak Common, all currently at various stages of determination, continued to move forward without interruption this week.

Smaller practices bore the brunt. Architectural firms operating out of hubs like Clerkenwell and the Shoreditch Tech City cluster said their project managers spent much of Wednesday and Thursday re-uploading corrected image sets, burning billable hours on what should have been a routine administrative step. One practice with offices near Farringdon station described logging more than six hours of staff time on resubmissions for a single residential conversion application in Peckham.

The Wider Context of a Creaking Digital Infrastructure

This week's disruption is not an isolated glitch. The Planning Portal — the national gateway through which most English councils receive applications — processed over 500,000 applications in 2024 according to its own published figures, a volume that has increased steadily year on year. London accounts for a disproportionate share of that load, with the GLA's London Plan data showing the capital received roughly 77,000 planning applications in 2024-25 alone.

The Local Government Association has previously raised concerns, without specifying boroughs, about the patchwork of back-end systems different councils use to process those applications once received. Some boroughs upgraded their infrastructure after the 2020 pandemic forced a rapid shift to digital-only submissions; others are still running legacy versions of Uniform or Idox software that date back more than a decade.

City Hall has been in dialogue with the Ministry of Housing, Communities and Local Government about a standardised London-wide digital planning infrastructure, but no confirmed funding or implementation date has been announced publicly.

For applicants caught in this week's backlog, the practical advice is straightforward. Check your submission portal account now — if your application was submitted between 28 June and 3 July, log in and confirm that all uploaded images display correctly and are associated with the right case reference. If images appear duplicated or misassigned, contact the relevant borough's planning inbox directly rather than waiting for a case officer to flag it. Southwark, Tower Hamlets, and Lewisham have each confirmed they will not penalise applicants for resubmission delays caused by the system error, and the validation clock will be reset accordingly. The Uniform provider has reportedly issued a patch, but borough IT teams are expected to need several more working days to fully clear the backlog before normal processing resumes.