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The report evaluates the design of proposed tax incentives for residential thermal retrofits in Germany, focusing on whether to support single or comprehensive measures, the appropriateness of the KfW 85 standard, the optimal timeframe for project completion, and the risks associated with stepwise implementation. Based on a survey of 78 practitioners, the document argues that comprehensive retrofits are superior for energy savings and comfort, and that a 10-year flexibility period for completion is unnecessary. It also highlights the critical importance of a specific sequence of measures to avoid structural damage and cost increases.