Stringent limits and reduction strategies paths on greenhouse gas (GHG) emissions are being defined at different levels to limit global warming. Carbon budgets and impact reduction targets are the main instruments used today to set goals and follow progress across industrial sectors and countries (e.g.: IPCC, Paris Agreement, science-based targets, etc.). In this context, translating global goals to local realities implicates a set of different challenges. Standardized methodologies of allocation can support a target-cascading process. On the other hand, local strategies are not currently designed to directly respond to carbon budgets in a 2050 horizon. The life cycle analysis of buildings implicates an intricate cross-industry and cross-border carbon accounting. For these reasons, effective and aligned targets are needed to support and guide all actors in the construction sector. This chapter aims at addressing these challenges by identifying carbon reduction strategies compliant with a limited carbon budget in a dynamic approach using the Swiss built environment as a case study. This approach allows for the assessment of current best practices in regard to limited budgets and the determination of specific dynamic carbon targets for the building stock. Results show the misalignment of global goals with current practices and present the magnitude of effort that would be required to have a chance to limit global warming to 1.5°C or 2°C. An adequate, interconnected, and interdisciplinary carbon-targets definition is needed to align stringent global climate goals with local climate strategies. The proposed methodology allows for this definition at different scales and sectors in a specific context.