Next-generation building envelopes: Smart materials, energy efficiency and environmental impact

Building envelopes play a crucial role in enhancing the energy efficiency, sustainability, and overall performance of modern buildings. This paper provides a comprehensive review of cutting-edge materials and technologies for smart and sustainable building envelopes. It highlights the transition from traditional to advanced materials, focusing on the integration of smart materials such as thermochromic and electrochromic systems, shape memory alloys, and self-healing materials. These innovations enable dynamic responses to environmental changes, enhancing comfort and energy efficiency. Additionally, the review explores sustainable materials, including natural, biodegradable insulation, recycled components, and low-carbon alternatives that contribute to the circular economy. Advanced insulation technologies such as vacuum insulation panels, phase change materials, and aerogels are discussed, emphasizing their superior thermal performance. The study also examines innovative facade solutions, such as adaptive facades, photovoltaic-integrated systems, and hybrid designs that merge sustainability with energy generation. Key challenges in adopting these materials—such as cost, regulatory compliance, and market readiness—are discussed, along with the environmental benefits, including energy savings and reduced carbon footprints. The paper concludes by identifying opportunities for future research and development in smart and sustainable building envelopes, highlighting their potential in advancing energy-efficient, climate-responsive architecture.