The building stock decarbonization by 2050 requires the implementation of an energy transition strategy. Building energy codes must be considered to minimize the energy consumption of the residential sector. This paper aims to evaluate the evolution of the building energy codes of Spain based on energy simulation. A quantitative assessment of the residential thermal demand according to the new energy efficiency requirements introduced in national regulations over the years was performed. Heating, cooling, and domestic hot water demands were assessed for 60 cases modeled in DesignBuilder, combining different building geometric typologies, energy codes, and climate zones. Heating presented the largest contribution to the total energy demand reaching up to 75%. The codes’ evolution led to a significant reduction in heating and a slighter decrease in cooling. The results showed an average energy demand improvement of 50% from the first regulatory release to the latest one.

到 2050 年建筑存量脱碳需要实施能源转型战略。必须考虑建筑能源法规，以尽量减少住宅部门的能源消耗。本文旨在基于能源模拟评估西班牙建筑能源法规的演变。根据历年国家法规出台的新能源效率要求，对住宅热需求进行了量化评估。对在 DesignBuilder 中建模的 60 个案例的供暖、制冷和生活热水需求进行了评估，结合了不同的建筑几何类型、能源规范和气候区。供暖对总能源需求的贡献最大，高达 75%。代码的演变导致加热显着减少，冷却略有减少。结果显示，从第一次监管发布到最新发布，能源需求平均提高了 50%。