Thermal Efficiency Retrofit of Residential Buildings: The German Experience

This report by the Climate Policy Initiative analyzes the policies and decision-making processes surrounding the thermal efficiency retrofit of residential buildings in Germany. It outlines the government's goal to reduce primary energy demand in buildings by 80% by 2050 and examines the barriers and levers—including information tools, financial incentives, and contractor certification—needed to increase both the rate and depth of retrofits.

• The German government aims to reduce the primary energy demand of buildings by 80% by 2050, with an interim target of reducing heat demand levels by 20% by 2020. To achieve this, the annual rate of thermal retrofits for outer walls in residential buildings must increase from approximately 0.8% to 2%.
• Deep thermal retrofits are more economically viable when integrated into general building renovations (such as those for appearance or maintenance) rather than as standalone projects. In such cases, the cost of the thermal component is reduced to about one-third of the full costs of a standalone thermal retrofit.
• Homeowners' decision-making regarding retrofits occurs in three stages: moving from being uninterested to planning, then from planning to investing, and finally ensuring optimal implementation by contractors. Different policy tools are required for each stage, such as general information (TV/press) for the uninterested and trusted professional advice for those planning.
• Financial incentives provided by KfW, including preferential loans and grants, are designed to encourage deeper retrofits by increasing the share of investment costs supported as post-retrofit thermal performance improves. However, evidence suggests that small increases in support (e.g., from 14% to 18%) are insufficient to drive most owners toward deeper retrofits.
• The German government is considering tax incentives as an alternative or supplement to KfW support. Under the proposed scheme, costs for reducing energy demand would be tax-deductible over ten years if the building reaches 85% of the new-build standard, potentially covering 35% of costs for self-occupied buildings for those in the highest income bracket.
• The quality of retrofit implementation is often hindered by insufficient contractor education regarding the coordination and communication of deep thermal retrofits, particularly at the interfaces between different building components (walls, windows, roofs).

APA

Neuhoff, K., Amecke, H., Novikova, A., & Stelmakh, K. (2011). Thermal Efficiency Retrofit of Residential Buildings: The German Experience. Climate Policy Initiative. https://www.climatepolicyinitiative.org/wp-content/uploads/2011/12/Policies-Supporting-Thermal-Efficiency-in-Germanys-Building-Sector.pdf

Chicago

Neuhoff, Karsten, Hermann Amecke, Aleksandra Novikova, and Kateryna Stelmakh. Thermal Efficiency Retrofit of Residential Buildings: The German Experience. Climate Policy Initiative, 2011. https://www.climatepolicyinitiative.org/wp-content/uploads/2011/12/Policies-Supporting-Thermal-Efficiency-in-Germanys-Building-Sector.pdf.

Wikipedia

{{cite report |last1=Neuhoff |first1=Karsten |last2=Amecke |first2=Hermann |last3=Novikova |first3=Aleksandra |last4=Stelmakh |first4=Kateryna |title=Thermal Efficiency Retrofit of Residential Buildings: The German Experience |publisher=Climate Policy Initiative |date=September 2011 |url=https://www.climatepolicyinitiative.org/wp-content/uploads/2011/12/Policies-Supporting-Thermal-Efficiency-in-Germanys-Building-Sector.pdf |access-date=17 August 2026 |via=Climate Insights Directory}}

BibTeX

@techreport{neuhoff2011thermal, author = {Neuhoff, Karsten and Amecke, Hermann and Novikova, Aleksandra and Stelmakh, Kateryna}, title = {{Thermal Efficiency Retrofit of Residential Buildings: The German Experience}}, institution = {Climate Policy Initiative}, year = {2011}, month = sep, url = {https://www.climatepolicyinitiative.org/wp-content/uploads/2011/12/Policies-Supporting-Thermal-Efficiency-in-Germanys-Building-Sector.pdf}, urldate = {2026-08-17}, note = {Indexed by Climate Insights Directory} }