This article introduces the SmartLivingEPC rating system, a thorough methodology designed to evaluate building performance based on energy, environmental, and smart readiness indicator. SLEPC is an evolution from earlier frameworks, improving asset rating precision through the incorporation of Building Information Modeling (BIM) data [1] and its adaptability to diverse building typologies, such as residential and tertiary structures. The suggested system assesses a wide range of variables, including energy efficiency, non-energy aspects, smart readiness, and environmental sustainability, with the objective of achieving a comprehensive rating methodology at building level. The SLEPC technique is fundamentally characterized by its swift and adaptable calculation model, enabling the effortless integration of sustainability indices, prospective developments in construction technology, and various building types. The evaluation methodology incorporates smart readiness guidelines that analyze a building’s adaptability to user requirements, energy flexibility, and operational efficiency, alongside environmental indicators including climate impact, resource consumption, and life cycle analysis. To enhance occupant well-being, important indoor environmental quality (IEQ) [6] factors are carefully assessed, such as thermal comfort, air quality, and acoustic performance. To assess the effectiveness of the SLEPC rating system, a pilot case is presented in this paper. Through the implementation of a rating system, SLEPC conforms to European benchmarks, converting intricate performance measurements into a comprehensible score that enables stakeholders to make educated choices regarding sustainable and resilient built environments.