According to a report by ‘Spiegel’, climate and legal policymakers in the Union anticipate that the proposed legislation may face challenges at the Federal Constitutional Court due to potential violations of the Basic Law. This follows a 2021 ruling mandating government action on climate protection. While the Ministry of Economic Affairs maintains confidence in the law’s legal standing, criticism has emerged from the property owners’ association Haus und Grund and the tenants’ association, labeling the modernization law as impractical and socially unjust. Additionally, the National Regulatory Control Council has described the coalition’s draft as overly complex and difficult to understand.