In recent years, there has been a growing interest in addressing human-induced impacts on the environment, with a particular focus on transitioning to sustainability and achieving carbon neutrality. However, the current implementation of Whole Life Carbon (WLC) and Life Cycle Assessment (LCA) in the construction sector in the Czech Republic is hindered by several challenges. These include gaps in stakeholders’ knowledge, limited availability of LCA data on construction products and buildings, insufficient market incentives, and low institutional capacity. This study, conducted as part of the INDICATE project, aims to streamline the process of WLC calculation and establish a consistent national assessment method specific to the Czech context. The project encompasses various phases, i.e., a case study collection of office, multi-family, single-family, education, and logistic hall buildings, followed by the development of a comprehensive unified materials database, classification of building parts and uniform work with the bill of quantities, stakeholder engagement, an LCA of case studies with a sensitivity analysis, and WLC policy suggestions, including the quality of the project data, simplifications, and a benchmarks definition. The Global Warming Potential (GWP) is calculated throughout the entire life cycle of each considered building, utilizing the EU Level(s) methodology incorporated in the OneClick LCA software. By adhering to these newly developed methodological steps, benchmarks for multi-residential buildings are shown. The same methodology could be replicated by stakeholders in other countries to enhance their evaluation processes and ensure consistent results across their projects.

Life cycle assessment (LCA) has become an important part of building design optimization. Design studios need tools that make the LCA of buildings faster and simple, and provide results that allow comparison between variants. The objective of this study was to show the possibility of LCA data integration into the existing building design tool, the DEK Building Library, which is already widely used in the Czech Republic, by connecting it to 1200 items of the largest Czech cost-estimating database, and the application of this connection into building information modeling (BIM) tools. This process also included the large-scale adaptation of 160 relevant LCA data. The main result was obtained using EnviBIM, a freely accessible BIM plugin, as well as a web interface that allows users to receive cradle-to-gate environmental impacts of DEK Building Library elements. Additionally, a semi-automated algorithms system for different groups of building materials and elements named EnviDataGenerator was developed in MS Excel, which enables the consistent linking of LCA data to the cost-estimating database items. This allows EnviBIM extensions and upgrades. The EnviBIM module was validated using case studies of three buildings modeled in ArchiCAD and REVIT. The difference in results compared to the manual calculation was 3.1% to 10.9%, which was considered a success.

Achieving a sustainable built environment requires a strategic shift toward Whole Life Carbon (WLC) assessment and regulation. This paper presents key recommendations for integrating WLC into national policies across EU member states, based on insights from the INDICATE project and the EPBD IV directive. It highlights the need for transparent, harmonized methodologies aligned with European standards (e.g. EN 15978, Level(s)), national LCA databases, and robust benchmarks grounded in statistical case studies. Practical measures include developing user-friendly calculation tools, simplifying procedures for small projects, and embedding WLC assessments into legislation with clear implementation timelines. The paper also emphasizes capacity-building through education, stakeholder engagement, and international collaboration. These steps are essential to decarbonize the construction sector and contribute meaningfully to climate neutrality goals, ensuring that sustainability is embedded throughout the entire lifecycle of buildings.