The Urban Design as a Key Factor in Architectural Sustainability: The Case Study of Barcelona

This paper explores the intersection of sustainability and architectural design within the urban context, emphasizing the cultural and historical layers that shape environmentally responsive development. It critiques the prevalent reliance on Green Building Rating Systems (GBRSs), arguing that while these frameworks address technical efficiency, they often neglect contextual and aesthetic dimensions. Instead, the author advocates for an integrated approach where sustainability is both a performance and a cultural value, expressed through form, space, and historical continuity. The study focuses on Barcelona as a paradigmatic case, illustrating how the city has transformed post-Franco dictatorship through deliberate urban planning, green infrastructure, and architectural excellence. The Barcelona Model exemplifies how urban regeneration—particularly the design of green public spaces, adaptation of brownfields, and innovative projects like the “Superblocks”—can promote climate resilience, reduce pollution, and enhance social well-being. Historical urban design precedents, such as Berlage’s Amsterdam plan, the Viennese Höfe, and Modernist settlements like the Berlin Siedlungen, are discussed to underscore the legacy of integrating greenery into dense urban fabrics. The paper argues that sustainable cities require a rethinking of density, morphology, and nature, not as opposites but as complementary forces. Ultimately, it proposes that true sustainability in architecture demands a deeper synthesis of ecological goals with urban history and spatial imagination—one where green infrastructure becomes a central actor in defining livable, adaptive cities.