When researching circular construction, one encounters a wealth of innovative approaches – alongside numerous obstacles. Today, few architecture or engineering practices can avoid the topic, yet only a handful of projects truly meet its demands. Doing full justice to the concept might require looking back to traditional buildings or practices from other cultures. Even the most promising ideas often stumble due to costs, performance requirements, or regulatory constraints.
The cradle-to-cradle principle envisions buildings returning to the natural cycle after use. In practice, however, most are only partially composed of natural or compostable materials. One notable exception is Florian Nagler’s Garden House, winner of the Detail Award, which closely follows this principle (page 30). Another route is the reuse or refurbishment of components from demolished buildings (pages 58, 74). But this, too, is complex – components are often scarce and costly to extract and and make fit for new applications.
To facilitate recycling, some structures are being designed for disassembly (page 40, 58, 66). Yet even timber joints fixed with screws can prove difficult to undo after years in place (page 84). A research group in Arles (page 48) sees itself as a recycler of remnants, developing new materials from construction debris and agricultural waste: sunflower stalks become acoustic panels, while rice straw from cultivation is turned into insulation. The team also experiments with local resources: in nearby salt pans, salt crystallises on metal racks to form tiles, while algae are used to make lamps, vases, and wall finishes.
Architecture made from rubble, clad in salt, rice, and seaweed – a compelling vision of the future. Perhaps the most promising path lies in combining these diverse strategies.