Review of biophilic design concept as a sustainable approach in architecture

Biophilic design has emerged as a transformative approach in contemporary architecture, restoring the intrinsic connection between humans and nature through sustainability-oriented design. This article examined biophilic design as a sustainable architectural paradigm that integrates natural systems, ecological performance, and human-centred wellbeing within built environments. Drawing on the biophilia hypothesis and sustainable design theories, the study examined how integrating natural elements, spatial configurations, and environmental analogues contributes to energy efficiency, mental and physical health, biodiversity enhancement, and long-term ecological resilience. A PRISMA-guided qualitative narrative literature review of 70 sources was conducted, supplemented by cross-typological analysis of three purposively selected case studies. The review demonstrates that biophilic design is not only an aesthetic or wellness-oriented approach but a critical strategy for achieving climate-responsive architecture. Available evidence suggests associations between biophilic interventions - including daylight optimisation, natural ventilation, green infrastructure, and restorative spatial planning - and reduced operational carbon emissions, improved occupant productivity, emotional wellbeing, and social engagement, although the strength and generalisability of these associations are contingent on implementation quality, building typology, and local climatic and cultural conditions. Existing studies indicate that biophilic environments are associated with reduced stress responses, enhanced cognitive performance, short-term memory improvements of up to 14% under controlled conditions, and shorter patient recovery times in healthcare settings, though most of this evidence derives from observational, single-setting, or self-reported study designs. Economic evidence suggests that long-term gains from reduced operational costs, higher property values, and productivity improvements may offset higher initial installation costs in many documented contexts, though this conclusion is sensitive to methodological assumptions about how indirect benefits are quantified and cannot be uniformly generalised across all building types and markets. Cross-case analysis confirms consistent environmental and human co-benefits, though effective implementation requires contextual calibration to local climate, culture, and regulatory conditions. Barriers to mainstream adoption and methodological inconsistencies in the evidence base remain significant and were examined. The study concludes by advocating policy integration, interdisciplinary collaboration, and innovative design frameworks to mainstream biophilic design as a foundational pillar of sustainable architecture in the 21st century.