The City of London has warned that tighter tall-building controls proposed around the Tower of London could put up to £1.2bn of annual economic output at risk, as the government-ordered examination of the City Plan 2040 remains unresolved. Historic England wants changes to the eastern edge of the City Cluster to create a larger gap of clear sky around the Tower and a skyline that steps away more gradually from the World Heritage Site. An additional examination hearing was held at Guildhall on 2 September, but no policy change has been agreed and the inspectors have not yet issued their findings.
The dispute matters because the City Plan is intended to support at least 1.2 million sq m of additional office floorspace by 2040, much of it concentrated in the City Cluster. That commercial pipeline sits behind the continuing wave of major tower applications and approvals tracked in LCM’s City of London planning pipeline analysis.
The Tower of London with the City Cluster skyline behind it, illustrating the planning debate over tall-building contours and the setting of the World Heritage Site. Original Photo: London Construction Magazine.
Government Reopened One Part of the City Plan Examination
The City Plan had already passed through its main Examination in Public hearings and consultation on proposed modifications when Housing and Planning Minister Matthew Pennycook intervened. An initial direction was issued on 25 June 2026 and replaced by a clarified direction on 16 July under section 20(6A) of the Planning and Compulsory Purchase Act 2004.
The operative direction prevents inspectors Jameson Bridgwater and Alastair Phillips from issuing their final City Plan report and limits their further consideration to one specific issue: whether Historic England’s alternative City Cluster tall-building contours, or those currently shown in Figure 15 of the City Plan, provide the better balance between protecting the Tower of London’s World Heritage status and avoiding undue restrictions on economic growth. The additional hearing took place on 2 September. A second session provisionally scheduled for 3 September was not required. The inspectors must now prepare a post-hearings letter setting out their findings.
Historic England Wants the Eastern Cluster to ‘Lean Away’
Historic England argues that the form, scale and location of development allowed by the City’s proposed contours would cause serious harm to the Outstanding Universal Value of the Tower of London. Its alternative is focused on the eastern edge of the City Cluster rather than imposing a general ban on skyscrapers. The proposal would retain a larger uninterrupted gap of clear sky between the White Tower and the bulk of the cluster and create a more gradual profile that “leans away” from the heritage site.
Historic England describes its alternative as the “minimum response necessary” and maintains that the City could still meet its office floorspace requirement under the revised contours. The direct difference between the two contour approaches has previously been assessed at around 32,000 sq m of potential net internal office floorspace. The City, however, argues that this does not capture the potential viability consequences of removing upper floors from tall-building sites.
City Models Up to 106,000 Sq M of Floorspace at Risk
The City Corporation’s case is that the alternative contours could have a much larger effect if reduced height and floorspace uplift makes some development sites commercially unviable. Its upper modelling scenario puts as much as 106,000 sq m of office floorspace at risk. The Corporation estimates that could equate to between 2,100 and 6,800 jobs and between £366m and £1.2bn of annual gross value added.
Those figures are scenarios, not confirmed economic losses. The City itself describes the underlying capacities as theoretical rather than specific development proposals, making the distinction important for anyone assessing the future construction pipeline. The debate is particularly significant around Fenchurch Street and the eastern side of the commercial cluster, where high-rise delivery is already changing the skyline. LCM’s recent examination of 50 Fenchurch Street shows the scale of construction activity already moving through constrained City sites, although the live project should not be treated as automatically affected by the current contour dispute.
UNESCO Has Increased the Pressure on London’s Planning Rules
The argument is taking place against stronger scrutiny from UNESCO. The World Heritage Committee has expressed concern about the cumulative effect of high-rise development on the Tower of London’s Outstanding Universal Value and has requested a Reactive Monitoring mission before 1 February 2027.
The UK must also provide an updated state-of-conservation report by that date. UNESCO has referred to the possible future inscription of the Tower on the List of World Heritage in Danger, but no such decision has been made.
Historic England argues that modifying the City Plan would strengthen the UK’s case that effective action is being taken. The City maintains that its existing contours, alongside other heritage and planning safeguards, already provide sufficient protection and that Historic England’s alternative would impose economic costs without a material improvement in heritage outcomes.
Scaffolding and temporary works at the Tower of London, whose World Heritage Site setting is at the centre of the City Plan 2040 tall-building debate. Original Photo:London Construction Magazine.
LCM Analysis: This Is a Development Envelope, Not a Tower Ban
For construction professionals, the most important distinction is that the disputed contours are strategic planning controls rather than individual planning permissions. Changing the contours would influence the maximum height and massing that future schemes can pursue on affected sites. That can alter net floorspace, structural form, façade area, vertical transportation requirements and ultimately viability before a scheme reaches procurement or construction.
It does not mean that every consented City tower would suddenly be cancelled. Individual schemes have different planning positions and delivery stages, a distinction that is also central to LCM’s London Planning Pipeline 2027–2030, where consent, demolition, enabling works and main construction are tracked separately. Nor is it currently possible to say which future tower projects would definitely be reduced, redesigned or prevented from proceeding. Until the inspectors publish their findings and any subsequent modifications are known, project-specific effects remain unconfirmed.
What Happens Next?
The next significant document will be the inspectors’ post-hearings letter setting out their conclusions on the competing City and Historic England contour approaches. The ministerial direction remains in force until withdrawn by the Secretary of State, meaning the inspectors cannot yet issue their final examination report. Further modifications may follow depending on their conclusions before the City Plan can move toward adoption. The Corporation has indicated that adoption is anticipated in late 2026, but the timetable remains dependent on resolution of the current intervention.
Until then, the eastern City Cluster remains caught between two competing priorities: protecting the international significance of the Tower of London and maintaining enough development capacity to support the Square Mile’s next generation of commercial construction.
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Expert Verification & Authorship: Mihai Chelmus
Founder, London Construction Magazine | Construction Testing & Investigation Specialist |
