Why We Need a Built World Summit

Monday 18 May 2026

Book your space at the Built World Summit

Subscribe to NLA's newsletter

Senior Advisor
NLA

In the first of a new series for the Built World Summit, Prof Greg Clark CBE sets out the case for a global convening dedicated to the built environment. Exploring the scale, influence and fragmentation of the sector, the article argues why this moment demands stronger collective leadership, and why London is uniquely placed to host the conversation.

The Built World is the largest asset class on the planet. The buildings, infrastructure, and places that constitute it are valued at roughly US $380 trillion, around half of total global wealth.1 Residential property alone accounts for some US $287 trillion.2 The construction sector produces around US $13 trillion of annual output, equivalent to about seven per cent of global GDP.3 Including construction, real estate, and building operations, the broader built environment ecosystem supports around ten per cent of all jobs worldwide.4 Property-related taxes generate five to six per cent of total tax revenue across OECD countries, equal to about two per cent of GDP, or roughly €319 billion in the European Union alone in 2023.5 Building operations account for between thirty and thirty-four per cent of global final energy use, and between twenty-six and thirty-seven per cent of energy and process-related CO₂ emissions.6

By any reasonable measure, this is the most consequential physical and economic system on the planet. It is the literal fabric of our daily lives, the foundation of global wealth, the largest single source of public revenue in most national economies, and the spatial framework through which economic activity, social life, and civic identity are expressed.

And yet, paradoxically, the Built World does not have a global summit of its own. Climate has COP. Trade and macroeconomics have Davos. Sovereign finance has the IMF and World Bank Annual Meetings. Multilateral diplomacy has the UN General Assembly. City government has Habitat and the World Urban Forum. Even individual disciplines within our own sector, real estate, infrastructure, sustainability, design, planning, asset management, have their own dedicated convenings. But the converged leadership of the Built World, the senior investors, developers, designers, engineers, civic leaders, asset owners, and policy makers whose decisions shape the trillions of dollars in motion, has no single annual moment in which to come together.

The Built World Summit, hosted by NLA at Guildhall in London on 29 June 2026, is intended to be that moment. This is the first of three weekly articles about the Summit. It sets out why we believe the Summit is needed, why now, why London, and what we hope it will achieve.

We meet at a particular moment in human history. The world’s urban population has grown from around 2.3 billion in 1980 to a projected 9.2 billion by 2080.7 But the headline number conceals a deeper truth. We are reaching the end of a 250,000-year arc of population growth, and the conclusion of an 8,000-year journey of city making, in which growth has been broadly assumed to be universal, endless, and uniform. That assumption is no longer safe. Different regions, and different cities within them, are moving through distinct urban cycles. Some are still expanding rapidly; others are stabilising; others are ageing or shrinking. We have entered the century of cities, but it will not be a century of uniform urban expansion.

The largest asset class without a unified voice

The Built World suffers from a particular structural problem. It is at once entirely indispensable to modern life and unusually diffuse as an industry. Capital flows into it through dozens of channels, including pension funds, sovereign wealth funds, insurance balance sheets, private equity, infrastructure funds, family offices, REITs, listed and unlisted real estate operators, and the public balance sheet itself. Capability is distributed across many disciplines: planning, design, engineering, finance, construction, operation, regulation, and asset management. Civic responsibility is shared between national governments, mayors, regulators, and the professional bodies. The Built World is everywhere; but it does not always speak with one voice.

This matters because the questions now facing the sector are not the kind that can be answered by any single profession or any single market. They are convergent questions. How should investment theses incorporate the full physical, transition, and adaptation costs of climate change? How should the next generation of urban housing be financed when public balance sheets are constrained, yields are repricing, and supply is structurally restricted? How should digital infrastructure, including data centres, resilient energy supply, and sufficient land, be funded across a full investment cycle? How should public and private sectors share the generational responsibilities of places that will outlast every person now living?

These are not technical questions. They are leadership questions. They demand a collective conversation among the people whose decisions actually shape outcomes.

If the United Nations or a national government wished to engage the Built World on the future of the planet, who would they call? The honest answer today is: no single body. NLA, ULI, EPRA, RICS, RIBA, and others each speak for an important part of the picture. None speaks for the whole. The Summit is, in part, a deliberate response to that gap.

A decisive moment

The Summit takes place at a turning point. The Built World is entering its next great investment cycle, and the conditions of that cycle are fundamentally different from the one before.

Population growth is slowing in many regions. Urbanisation continues, but unevenly: some cities are expanding, some are stabilising, some are ageing, some are shrinking. By 2080, the world is projected to contain roughly 1,600 cities of more than one million inhabitants.8 Climate risk is intensifying, both physically and as a transition cost. Digital technologies are reshaping the operating logic of buildings and infrastructure. Public finances are tighter. Housing affordability is in crisis in almost every successful city. Capital is repricing, with interest rates and credit conditions rewriting how value is created and how developers finance projects.

Each of these forces would, on its own, reshape the sector. Together, they are rewriting the framework of value creation. Capital gains are giving way to income stability. Single-asset logic is giving way to cycle-long stewardship. Expansion is giving way to adaptation. In much of the developed world, the city of the future is already largely built; the central task is now to retrofit, renew, and reprogramme inherited fabric. In other regions, new cities and districts must still be built, but they must be more frugal, more flexible, and more resilient than their twentieth-century predecessors.

Decisions taken about the Built World do not work on quarterly cycles. They shape outcomes for decades, often centuries. We are now living among, and inside, the consequences of decisions taken seventy or a hundred years ago, and in some cases far longer. The decisions taken in the next ten years will, in turn, define the cities and lives of the next several generations. A serious conversation, at the highest level, among those whose decisions actually matter, is overdue.

The opening session of the Summit will pose five questions to three of the world’s leading Built World investors. They concern, in turn, the investable universe of cities at a moment of demographic divergence; the credible incorporation of physical and transition climate risk into investment theses; the financing of digital infrastructure and the data economy across a full investment cycle; the institutionalisation of urban housing at the scale that affordability now requires; and the architecture of durable partnerships between public and private sectors capable of carrying generational responsibilities. These five questions are not abstract. They are the questions that capital must answer if the next cycle is to address, rather than inherit, the unresolved tensions of the current one.

Why London

London is not the only place where this conversation could happen. But it is, in important respects, the right place to begin.

For nearly two thousand years, London has improvised, negotiated, and rebuilt itself. It has rarely been planned as a finished object. It has absorbed villages and towns, reinvented its districts, and repeatedly reshaped its spaces as needs evolved. This culture of adaptation is embedded in the city’s DNA. Anyone who works on London quickly discovers that it is a learning system more than a master plan.

Out of that culture has come something distinctive. London hosts an unparalleled concentration of the people, firms, and institutions that plan, design, finance, build, operate, and renew cities. It is one of the world’s largest clusters of investable real estate and infrastructure assets. It is also one of the most highly traded service economies in the built environment industry, with London-based firms delivering complex projects across Europe, North America, the Middle East, and Asia.9

This is why London is the appropriate host. Not because London is a model to be copied wholesale, but because it is a place where the practice of city making is unusually well developed and unusually diverse. London is a learning city: a place where renewal and growth, retrofit and new build, stewardship and invention, sit alongside one another. It is somewhere the global community of practice can compare cycles, test ideas, and learn across difference.

It is also, for these reasons, the right setting for an honest conversation about leadership. London’s track record is mixed. Its successes are striking; its failures, particularly around housing affordability and the slow pace of decarbonisation, are real. The Summit does not assume that any city has all the answers. It does assume that London, as a global hub of expertise and capital, is a serious place to begin.

The role of NLA

The Built World Summit is hosted by NLA, building on its position as London’s independent forum for the built environment. NLA has spent more than two decades convening the people who shape the city, across the public and private sectors, across investment, design, development, planning, and operation. Its recent work, in particular The Built Environment Sector and Connected Capital: London and the World’s Built Environment, sets out the case for London as a global hub for the practice of city shaping.10 The Summit extends that work outwards, from London to the global Built World.

The founding partners

NLA is joined at the Summit by an exceptional group of founding partners. Each leads a session on a distinct dimension of resilience. Together, the five sessions form a coherent programme covering the physical transformation of existing stock, the capital structures that enable renewal, the public assets and connected places that anchor new districts, the technical challenges of resilient infrastructure, and the investment and market intelligence that underpins all of the above.

Gensler leads the session on Retrofit at Scale. It introduces FutureFit, Gensler’s vision for the next chapter in commercial office design, and asks what good design now means when performance, flexibility, and sustainability are non-negotiable. The session opens with a keynote from Gensler’s Global Building Transformation and Adaptive Reuse Leader, followed by a panel of developers and tenants from global and London-based firms.

JLL leads the session on Finance for Innovation Geographies. It examines the changing capital base for real estate investment and what that means for cities competing to become centres of knowledge, technology, and enterprise. The session draws on the growing pool of private wealth, alongside institutional capital, to explore how investors, developers, and city leaders can connect global capital with high-quality, large-scale opportunities in the world’s most innovative urban geographies.

Places for London and Platform 4 lead the session on Connected Places. The session explores how publicly owned, well-connected land can catalyse new districts, deliver housing at scale, and strengthen the social and economic fabric of cities, particularly through the development of major station districts. It examines the conditions under which public land becomes a catalyst for inclusive, well-designed, and financially sustainable urban growth.

Savills leads the session on Delivering in a Resilient World. The session draws on insights from the Savills Resilient Cities Index, which measures 490 cities across five dimensions of resilience, and from its forthcoming June 2026 report Delivering in a Resilient World.11 It explores how investors, developers, and city leaders can sustain viable development across generations in the world’s most adaptable and durable cities, including the rising cohort of mid-tier centres now demonstrating the capacity to pivot and adapt.

Arup leads the session on Infrastructure as Catalyst. Drawing on projects across London, the Thames Estuary, and a range of international case studies, the session argues that infrastructure should be understood not as a constraint on cities but as their generative backbone. Well-designed ports, rail, transport, and energy networks are among the most powerful catalysts for inclusive growth, decarbonisation, and long-term prosperity that cities possess.

These five partner sessions sit between an opening panel of three of the world’s leading Built World investors, addressing the five questions that will frame the next investment cycle, and a closing leadership panel with NLA, EPRA, ULI, and Gecina. The closing panel asks who speaks for the Built World, and what leadership is now required to align capital, climate, and collective prosperity.

Together, this programme is a deliberate attempt to gather the right people to address the right questions, in the right place, at the right moment.

The Built World Declaration

The Summit closes with the signing of the Built World Declaration. It is a shared commitment, agreed by partners and leaders, to long-term value creation, adaptation and reuse, resilience, flexibility and frugality, and the leadership and learning needed to shape better cities and better outcomes across the coming decades.

It is, deliberately, both a statement of intent and a framework for accountability. It will not solve every problem. But it will, for the first time, place a coherent set of commitments on the table, signed by capital, capability, and civic leadership together. It is not a press release. It is a public, collective undertaking by the leadership of an industry that has, until now, lacked one.

What success looks like

The Summit will be judged, in the long run, on whether it changes anything. The test, in my view, has three parts.

The first is whether we, as an industry, leave Guildhall with a clearer collective view of the questions that matter. Not consensus on every answer, but a shared set of priorities, expressed publicly, and traceable to commitments that can be revisited a year later. The Built World Declaration is the principal vehicle for this.

The second is whether the Summit helps to move capital. Not in the trivial sense of new transactions announced on the day, but in the structural sense of better-aligned capital structures, more credible climate-adjusted returns, more durable partnerships between public and private sectors, and a stronger investor case for adaptation, retrofit, and resilient infrastructure. If the Summit accelerates that movement, even modestly, it will have justified itself many times over.

The third is whether the conversation continues. The Summit is intended to be the first of an annual series. Each year will have a theme, and a different set of partners, building cumulatively over time. The 2026 theme is Resilient Cities. Future themes will follow as the agenda evolves. Continuity is what turns a convening into an institution.

An invitation

This is the first of three weekly articles about the Summit. The next will examine in more detail how the Built World is changing, the forces driving that change, and the implications for capital, capability, and place. The third will set out what we believe should be the agenda for the next twenty-five years.

The Summit will gather around 500 senior leaders at Guildhall on 29 June 2026, with associated events through 1 July. Architects, planners, engineers, developers, investors, fund managers, civic leaders, and policy makers are all invited. If your work shapes, finances, designs, builds, operates, or governs cities, this Summit is for you.

Registration is now open through NLA. I hope you will join us at Guildhall, and at the start of what I hope will become an enduring annual conversation about the Built World, the largest asset class on the planet, the most important system we collectively manage, and the foundation of the cities we leave to those who follow.

Notes

Savills, World Real Estate Markets Report (London: Savills Research, 2024).
Savills, Total Value of Global Real Estate (London: Savills Research, 2024).
Oxford Economics, Global Construction Futures (Oxford: Oxford Economics, 2023).
International Labour Organization, Statistics on Construction and Real Estate (Geneva: ILO, 2023).
OECD, Revenue Statistics 2023: Tax Revenue Trends in the OECD (Paris: OECD Publishing, 2023); European Commission, Taxation Trends in the European Union (Luxembourg: Publications Office of the EU, 2024).
International Energy Agency, Buildings: Tracking Clean Energy Progress (Paris: IEA, 2024); UNEP, Global Status Report for Buildings and Construction 2024 (Nairobi: UNEP, 2024).
United Nations Department of Economic and Social Affairs, World Urbanization Prospects: The 2024 Revision (New York: UN DESA, 2024).
OECD, Cities in the World: A New Perspective on Urbanisation (Paris: OECD Publishing, 2020); United Nations Department of Economic and Social Affairs, World Urbanization Prospects: The 2024 Revision (New York: UN DESA, 2024).
NLA, Connected Capital: London and the World’s Built Environment (London: NLA, 2024).
NLA, The Built Environment Sector (London: NLA, 2023); NLA, Connected Capital: London and the World’s Built Environment (London: NLA, 2024).
Savills, Resilient Cities Index 2024 (London: Savills Research, 2024); Savills, Delivering in a Resilient World, forthcoming June 2026.

Book your space at the Built World Summit

Subscribe to NLA's newsletter

Prof. Greg Clark CBE

Senior Advisor
NLA