Building Less: Rethink, Reuse, Renovate, Repurpose

Le Corbusier's Unité d'Habitation imagined a "vertical neighborhood," a building able to integrate housing, commerce, leisure, and collective spaces within a single structural organism. Around the same time, Jane Jacobs argued that diversity of use is what produces safety, identity, and social life at the street level. Later, Rem Koolhaas, in Delirious New York, described the skyscraper as an early experiment in "vertical urbanism," capable of stacking incompatible programs under one roof. In cities like Tokyo and Hong Kong, this ambition matured into complex hybrid buildings where different uses, such as transit hubs, retail, offices, hotels, and housing, coexist and interact continuously.

In cities across the world, the relics of industrial production have become the laboratories of a new urban condition. Warehouses, power plants, and shipyards, once symbols of labor and progress, now stand as vast empty shells, waiting to be reimagined. Rather than erasing these structures, architects are finding creative ways to adapt them to contemporary needs, transforming spaces of manufacture into spaces of culture, education, and community life.

The municipality of Cunha, located in the state of São Paulo, Brazil, is a region known for its inland landscape, hilly terrain, and, especially, a major production of nationally renowned ceramics. It is within this context that the office messina | rivas has been working since 2017, with a set of projects located on a farm. Their work, which integrates design and construction in an indissociable manner, results in interventions that reveal a sensitive approach to pre-existing conditions and their surrounding environment.

Across India's varied geographies, from coastal backwaters to desert fortress cities, architecture evolved with a deep, instinctive connection to climate. These were not isolated craft traditions but complete ecological systems in which material cycles, thermal comfort, and community knowledge were interdependent. As COP30 turns global attention toward the links between heritage and climate resilience, India's vernacular practices appear less as historical artifacts and more as climate technologies refined over centuries.

While adaptive reuse has been increasingly acknowledged as a vital architectural strategy worldwide, its discourse and implementation in Asia are still expanding—driven by growing ecological awareness and a shifting understanding of architectural knowledge. Rather than accelerating a developmentalist model centered on demolition and new construction, architects today are confronted with a different approach to the built environment: treating the existing structure as a resource—an archive of materials, spatial organizations, and informal histories.

Across Europe and beyond, architects are confronting a turning point. As rising emissions targets collide with shrinking material supplies and the growing urgency of climate commitments, the built environment is being forced into a deeper reckoning with how it consumes, circulates, and discards resources. What was once considered waste is now revealing itself as a dormant architectural archive, an urban ecosystem of materials waiting to be reclaimed, revalued, or reimagined. Within this shift, architects are beginning to play a radically different role. Not only as designers of buildings, but also as orchestrators of the flows that sustain them.

For monuments worthy of sustained admiration, conservation practices have been selectively mobilized to reinforce their prestige and secure their place at the center of heritage narratives. Structures whose vernacular ought to be passed down miss the discerning eye of the experts. Rowhouses, shopfronts, and neighborhood structures that form the fabric of our cities are often left to deteriorate beyond repair. Much more is lost, apart from aesthetics. 

In a world facing ecological exhaustion and spatial saturation, the act of building has come to represent both creation and consumption. For decades, architectural progress was measured by the new: new materials, new technologies, new monuments of ambition. Yet today, the discipline is increasingly shaped by another form of intelligence, one that values what already exists. Architects are learning that doing less can mean designing more, and this shift marks the emergence of what might be called an architecture of restraint: a practice defined by care, maintenance, and the deliberate choice not to build.

Adaptive reuse is shifting from simple preservation to active revitalization, a process of structurally rescuing and reprogramming architectural typologies whose original functions are no longer relevant. The obsolescence of architectural spaces occurs for varied reasons: sociological shifts, leaving spaces uninhabited; technological advances, phasing out specific machinery; and economic changes, making centralized functions necessary. The strategy of repurposing focuses on achieving spatial and functional longevity through minimal interventions, allowing the original structure to serve as the memory anchor of the project.

India's palaces and former colonial warehouses are witnessing a new kind of restoration, one that happens beneath the surface. From discreet steel supports tucked behind centuries-old masonry to digital sensors embedded in frescoed ceilings, technology is quietly reshaping how heritage buildings are protected for the future. These upgrades are more about subtle precision and less about spectacle; invisible engineering wonders. 

Adaptive reuse allows architects to conserve resources, reduce waste, and extend the life of existing structures. By working with what already exists, architects lessen the need for new materials, lower energy consumption, and limit demolition debris. This approach protects natural habitats and green spaces by reducing the demand for new land development. Through reuse, cities become more sustainable and less carbon-intensive while preserving the material and cultural value of the built environment.

The history of the Olympic Games, while marked by athletic achievement, is consistently contrasted by infrastructure challenges. Across host cities, from Athens to Rio and Beijing, similar issues arise: significant cost overruns and the complex issue of legacy. The big question is: What is the best viable long-term use for purpose-built sport venues? Montreal's 1976 Games shared this fate after building an Olympic Park that faced heavy criticism for cost overruns and debt from specialized construction. Post-Games, venues like the Montreal Velodrome risked becoming a financial burden. However, the city demonstrated a proactive response by proposing the transformation of the building into a thriving civic asset that now stands as an internationally recognized example of successful Olympic venue repurposing.

Behind layers of plaster, paint, and finishes lies an intricate network of pipes, electrical conduits, beams, and other structural elements that make a building function and stand, yet remain invisible to the everyday eye. Within these layers, traces of different periods accumulate: replaced systems, improvised adaptations, and technical solutions that once responded to specific contexts and urgencies. In adaptive reuse, the greatest challenge often begins before construction even starts, which is understanding what lies within when little or no reliable documentation exists. During a renovation, pleasant or unpleasant surprises are inevitable. The unexpected is part of the process, but it also represents cost, delay, and risk factors that often discourage investors and professionals from engaging in this type of project.

Faced with the combined forces of population growth, economic prosperity, and urban expansion, cities are witnessing a significant rise in the movement of people and goods—mirroring the evolution of diverse mobility systems within urban environments. As technologies advance and modes of transport evolve, the adaptive reuse of train carriages, airplane cabins, and other service infrastructures reveals opportunities to explore their creative potential. Materials, technologies, and design tools converge around a shared goal: refurbishing and repurposing disused structures to give them new life.

There is growing awareness around sustainability—and the environmental cost of prematurely demolishing safe, structurally sound buildings only to replace them with new construction. In the broader race to reduce carbon emissions, corporations and institutions are placing greater emphasis on ESG performance (environmental impact, social responsibility, and governance). Many now require carbon accounting, set "carbon-neutral" targets, or purchase carbon credits to offset footprints.

As the late urban planner Jaime Lerner once argued, the future of architecture lies not in building new cities but in updating those that already exist. In a world where resources are finite and urban space is increasingly saturated, his statement feels more urgent than ever. It calls for architects to look inward, to rethink what truly needs to be built, and to recognize the creative potential of what is already there. Within the constraints of existing structures lies an opportunity to design differently: to repair, adapt, and reuse. Or, as French poet Louis Aragon would have it, to reinvent the past to see the beauty of the future.