Fired clay has been used in construction for over 9,000 years, evolving from vernacular craft into one of the most widely applied materials in the built environment. Its durability, water resistance, thermal performance, and adaptability have made it a staple for facades, sanitaryware, flooring, architectural surfaces, and structural systems. Today, new manufacturing technologies are extending these possibilities as architects and manufacturers confront the environmental implications of material extraction and production.
Bolete Lounge BIO® by Andreu World x Patricia Urquiola. Image Courtesy of Andreu World
When walking into a large living space, a hotel lobby, or an open-plan workplace, the first thing that can be noticed is not what divides the space, but what holds it together. There are rarely clear boundaries, no obvious rooms, no strict partitions, yet the space still feels organized. Some areas invite a pause; others dictate movement; others foster community. The transitions are subtle, but legible.
At the same time, these interiors are expected to do more. They must accommodate constant change, withstand intensive use, and respond to environmental pressures by reducing waste, extending lifespans, and avoiding frequent replacement. The question is not only how a space looks, but how it performs over time. What is actually doing the heavy lifting?
Using massive s plates, often several centimeters thick and weighing tons, Richard Serra's sculptures convey an almost improbable sense of lightness. This effect does not result from a reduction of mass, but from how that mass is organized: large curved surfaces tilt, narrow passages compress the body, and seemingly unstable elements create a constant sense of imbalance. Serra transforms weight into a dynamic spatial experience.
In architecture, lightness has occupied a central role at least since the modern period. While earlier traditions, such as Greek and Roman architecture, were closely associated with stability, and large churches with monumentality, the twentieth century introduced a decisive shift in how matter is handled, particularly through the separation of structure and enclosure.
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Dornbracht Madison fittings for Brenners Park-Hotel & Spa in Baden-Baden. Image Courtesy of Dornbracht
During renovation projects, replacement is often preferred over refurbishment. Used fixtures are removed, new products specified, timelines secured. Particularly in hospitality projects, where closures are costly and operations are tightly scheduled, installing new components appears to be the most reliable solution. It is faster, easier to coordinate, and aligns with established workflows. Refurbishment operates differently. It requires careful dismantling instead of disposal, evaluation instead of substitution, and trust in the quality of what is already there. It introduces complexity into a process designed for efficiency.
The recent renovation of Brenners Park-Hotel & Spa in Baden-Baden demonstrates that under the right circumstances, this additional effort can become a deliberate architectural strategy for similar projects, especially when the original materials were never intended to be temporary.
In the nineteenth century, entire railway networks became obsolete almost overnight, not due to physical deterioration, but because of changes in the technical standards that supported them. The expansion of railroads across Europe and North America adopted different track gauges (the transverse distance between rails), and as a dominant standard gradually emerged, these infrastructures became incompatible with one another. This required large-scale adaptations, conversions, or even complete reconstruction, in what became known as the "Gauge War."
With the mass adoption of telecommunications networks in the twentieth century, cities around the world built large telephone exchange buildings filled with electromechanical equipment responsible for routing calls between regions. These structures were highly specialized pieces of infrastructure, often occupying entire city blocks and organized around large-scale technical machinery. With the transition to digital switching technologies and, later, the widespread adoption of mobile telephony, much of this equipment became obsolete within a few decades. The buildings themselves often remained structurally sound, but the systems they were designed to support had already evolved beyond them.
Exhibitions can be an opportunity to extend architectural discourse beyond professional circles, opening conversations with broader publics and serving as an interface between architecture and society. Within this concept, major international events such as the Osaka International Expo 2025 and the Venice Architecture Biennale have adopted the idea of the circular economy as one of their organizational objectives. The idea of circularity in events can be reflected in, for example, their energy consumption, the impact of the displacement they generate, their waste, or the useful life of their infrastructure. The site destined for the last World Expo, held in Osaka from 13 April to 13 October 2025, was surrounded by a massive timber structure designed by Sou Fujimoto Architects, one of the world's largest wooden constructions. The Japan Association for the 2025 World Exposition committed to reusing building materials "as much as possible," with concrete plans for their reuse to be finalized by March. In the meantime, some relocation alternatives are already emerging for the pieces of the World Expo structure.
What if industrial leftovers weren't waste, but the start of architectural design? At Rieder's headquarters in Maishofen, Austria, over 1,300 cubic meters of timber, 180 ceiling elements, and hundreds of upcycled glassfiber-reinforced concrete fragments come together in a building shaped as much by reuse as by planning. The new production hall, designed by Kessler² Architecture, treats material leftovers as a design resource. Developed as part of a long-term investment in sustainable manufacturing, the timber-concrete hybrid building introduces a facade technique that inverts conventional architectural workflows: instead of designing first and producing components afterward, the building envelope is generated from the material remnants already available on site establishing a new language for industrial architecture.
Second Prize Winner + Buildner Student Award: Silent Equilibrium
Buildner is pleased to announce the results of its Architect's Chair Competition Edition 4, an annual international competition that invites architects and designers worldwide to submit designs for a signature chair. Following in the footsteps of iconic figures like Charles and Ray Eames, Ludwig Mies van der Rohe, Marcel Breuer, and Arne Jacobsen, participants are tasked with creating custom chairs that reflect their unique design philosophies and visions.
The pursuit of stronger, lighter, and more durable materials has guided architecture long before polymers or carbon fibers existed. One of the earliest large-scale examples of composite materials can be found in the Great Wall of China, where stone, clay bricks, and organic fibers such as reeds and willow branches were blended to create a resilient and lasting structure. These early techniques reveal a timeless intuition: distinct materials, when combined thoughtfully, produce properties unattainable by any single element. As the construction sector faces urgent ecological pressures, this intuition is being revisited through the lens of sustainability, with architects and engineers exploring bio-based, recycled, and hybrid composites designed not only for performance but also for circularity and environmental responsibility.
Which materials have taken center stage in the architectural discourse of 2025? Which projects have rediscovered new construction practices and methods through material innovation? While the future of building materials still appears uncertain, year after year, experimentation and research continue to reveal diverse practices, initiatives, and efforts dedicated to understanding their value and responsibility within the built environment. From agricultural waste that reduces carbon footprints to recycled plastics given new life, and living materials that engage with emerging technologies while reconnecting with nature, 2025 has highlighted and strengthened the role of architects as mediators between materials, disciplines, knowledge, and interests from diverse origins.
In much of China, concrete remains the dominant construction material. Despite growing concerns over its environmental impact, concrete continues to align with the priorities of many developers and clients—it is fast, cost-effective, and highly durable. As a result, most building types in China still rely heavily on concrete. This reliance is further reinforced by China's position as the world's largest producer of Portland cement. A deeply entrenched supply chain, rooted in raw material manufacturing and economic infrastructure, ensures that concrete remains the default choice in the construction industry.
Yet historically, Chinese architecture was built upon a rich tradition of timber construction. The Forbidden City is a prime example: not only is it emblematic of China's architectural heritage, but it also remains one of the largest and best-preserved collections of ancient wooden structures in the world. This legacy prompts an important question: does timber construction have a meaningful future in China's contemporary building industry?
The phenomenon known in biology as convergent evolution describes how distant species can develop similar structures when confronted with comparable challenges. Dolphins and ichthyosaurs, for example, are separated by millions of years of evolutionary history, yet both evolved nearly identical hydrodynamic bodies. Architecture has its own parallels: A-frame structures emerged independently in both the European Alps and Japan, even without direct cultural exchange, as spontaneous responses to snow, wind, and material scarcity.
https://www.archdaily.com/1037027/converging-trends-in-2025-architecture-circularity-biomaterials-and-carbon-conscious-designArchDaily Team
Bolete Lounge BIO®. Image Courtesy of Andreu World
What is the current global outlook on the recyclability of materials used in architecture? To what extent are contemporary societies truly committed to reducing environmental impact? In the effort to live in balance with nature, replacing fossil fuels with renewable energy sources is one of the key strategies for cutting greenhouse gas emissions and addressing global warming. Looking to nature for inspiration as a way to protect it means creating designs that incorporate sustainability, circularity, and recyclability from the very first sketch. From building systems to surface finishes, the use of biomaterials in architecture reflects a mindset rooted in long-term responsibility for a material's full life cycle.
How does the construction sector shape the future of cities? What challenges does it face? At the crossroads of demographic, social, energy, and climate pressures, the construction sector is changing fast. Professionals, institutions, and citizens are working together to build environments that improve health and well-being, encourages durable and place-responsive solutions, cut carbon emissions, withstand climate risks, and provide affordable, high-quality housing.
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.
About a month after the closing of Expo 2025 Osaka, the designs and constructions presented at the world's fair remain as a legacy. While the Bahrain Pavilion, designed by Lina Ghotmeh Architecture, drew particular attention this year for receiving double recognition, it was one among many awarded projects. During the awards ceremony held on the penultimate night of the event, a total of 45 awards were presented among 165 participating countries. The Official Participant Awards are granted according to pavilion size and type, recognizing excellence in Architecture and Landscape (for self-built pavilions only), External Design (for module pavilions only), Exhibition Design, Theme Development, and Sustainability. The recipients were selected by an international jury of nine experts who visited all national and thematic pavilions during two evaluation sessions in May and October 2025. The following overview presents all 45 pavilions distinguished in the five categories of the Official Participant Awards.
