Tax Incentives for Thermal Retrofits in Germany: Experiences from Practicioners

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.

• A strong majority of practitioners prefer comprehensive thermal retrofits over single measures for long-term benefits. Specifically, 70% recommended comprehensive retrofits, with experts citing them as the best option for energy savings (85%), coordination of measures (90%), and post-retrofit comfort (95%).
• Practitioners generally view the KfW 85 standard as a practicable target even without additional tax incentives. Survey results show 25% recommended a standard higher than KfW 85, 15% recommended KfW 85, and 30% recommended KfW 100 or 115.
• A 10-year flexibility period for completing retrofits is considered unnecessary by practitioners. While 55% believe extending the existing 36-month KfW period would encourage more deep retrofits, 96% of those respondents believe an optimal period is less than 61 months, with an average recommendation of 50 months.
• Stepwise retrofits carry significant risks if the sequence of measures is incorrect, potentially leading to mold and financial loss. 95% of practitioners stated that a specific sequence must be followed to avoid structural damage and additional costs; failure to do so can result in 15% reduced energy savings and higher total costs.

APA

Amecke, H., Neuhoff, K., & Stelmakh, K. (2012). Tax Incentives for Thermal Retrofits in Germany: Experiences from Practicioners. Climate Policy Initiative. https://www.climatepolicyinitiative.org/wp-content/uploads/2012/01/Tax-Incentives-for-Thermal-Retrofits-English-language.pdf

Chicago

Amecke, Hermann, Karsten Neuhoff, and Kateryna Stelmakh. Tax Incentives for Thermal Retrofits in Germany: Experiences from Practicioners. Climate Policy Initiative, 2012. https://www.climatepolicyinitiative.org/wp-content/uploads/2012/01/Tax-Incentives-for-Thermal-Retrofits-English-language.pdf.

Wikipedia

{{cite report |last1=Amecke |first1=Hermann |last2=Neuhoff |first2=Karsten |last3=Stelmakh |first3=Kateryna |title=Tax Incentives for Thermal Retrofits in Germany: Experiences from Practicioners |publisher=Climate Policy Initiative |date=18 January 2012 |url=https://www.climatepolicyinitiative.org/wp-content/uploads/2012/01/Tax-Incentives-for-Thermal-Retrofits-English-language.pdf |access-date=17 August 2026 |via=Climate Insights Directory}}

BibTeX

@techreport{amecke2012tax, author = {Amecke, Hermann and Neuhoff, Karsten and Stelmakh, Kateryna}, title = {{Tax Incentives for Thermal Retrofits in Germany: Experiences from Practicioners}}, institution = {Climate Policy Initiative}, year = {2012}, month = jan, url = {https://www.climatepolicyinitiative.org/wp-content/uploads/2012/01/Tax-Incentives-for-Thermal-Retrofits-English-language.pdf}, urldate = {2026-08-17}, note = {Indexed by Climate Insights Directory} }