The greenhouse effect is a global threat to our planet. If the world is to achieve the goals set, drastic changes need to take place. 21% of greenhouse gas emissions in Sweden stem from the construction and real estate sector. From 1 January 2022, a new legal requirement is introduced where a climate declaration will be required on all building permits applied for. The purpose of this study is to investigate the implementation of new legal requirements like the law of climate declarations. A great focus was placed on the legal requirement for climate declarations, but questions were also asked regarding older legal requirements by examining how the implementation of previous and current legal requirements has gone, the writers will then als...