Financing of facade insulation: How to reduce costs and energy consumption
23 Jul 2025
9
Minutes
Katrin Straub
CEO at nextsure
Facade insulation can reduce your heating costs by up to forty percent. However, the initial investment is high. Discover how you can significantly reduce the costs and increase the value of your property through government grants and smart financing models.
The topic in brief and concise terms
The cost of facade insulation ranges between 20 and 350 euros per square meter, but it can reduce heating costs by up to 40 percent.
State subsidies from BAFA cover 15 percent of the costs; with a renovation roadmap (iSFP), even 20 percent of up to 60,000 euros.
The BAFA subsidy can be combined with a KfW supplementary loan (up to 120,000 euros) from 2024, which facilitates financing.
Overview of the costs and benefits of facade insulation
Investing in facade insulation often pays off through reduced energy costs after just a few years. The costs vary greatly depending on the method used, ranging from 20 to 350 euros per square metre. For example, an external thermal insulation composite system (ETICS) costs between 120 and 200 euros per square metre. For a facade area of 100 square metres, this corresponds to an investment of 12,000 to 20,000 euros. However, with insulation, you can save up to 40 per cent on your heating costs. Additionally, the Building Energy Act (GEG) mandates insulation as soon as you renew more than ten per cent of the facade area. A well-planned construction financing is therefore the first step towards realisation. The investment not only protects against high energy costs but also secures the value of your property for the future.
Government grants: The Federal Support for Efficient Buildings (BEG)
The government supports your project with attractive grants through the Federal Promotion for Efficient Buildings (BEG). The Federal Office for Economic Affairs and Export Control (BAFA) provides a grant of 15 percent for individual measures such as facade insulation. The eligible costs are capped at 30,000 euros per residential unit and year, which corresponds to a maximum grant of 4,500 euros. Our expert tip: Use an individual renovation roadmap (iSFP). This increases the funding rate to 20 percent, and the eligible costs double to 60,000 euros. This way, you can receive a grant of up to 12,000 euros. Engaging an energy efficiency expert is mandatory for the application, but this is also subsidised by 50 percent. You must apply for these grants before the construction work begins. Proper planning is crucial to securing the maximum funding for your home and living.
Credit options for financing the remaining costs
Even after deducting the grants, there is often a significant financing requirement. For this, the Kreditanstalt für Wiederaufbau (KfW) offers special promotional loans. From 2024, the BAFA grant can be combined with the KfW Supplementary Loan (358/359), which provides up to €120,000 per residential unit. Owner-occupiers with a household income of up to €90,000 are eligible for additional interest benefits. As an alternative to the grant, you can use the KfW 261 loan for a comprehensive refurbishment to an energy-efficient house, which can include a repayment grant of up to €67,500. Another option is a classic modernisation loan for energy-efficient refurbishment, which is often granted without a land register entry. Comparing terms is essential in order to find the right financing solution.
Tax depreciation as an alternative to direct funding
If you do not take advantage of direct grants or subsidised loans, you can claim the costs of facade insulation for tax purposes. You can deduct 20 per cent of the expenses from your tax liability over a period of three years. The maximum tax reduction is 40,000 euros per property. In the first and second year, seven per cent of the costs (up to 14,000 euros) can be deducted, and in the third year, six per cent (up to 12,000 euros) can be deducted. It is important to note that this tax benefit cannot be combined with other public subsidies such as BAFA grants or KfW loans. Therefore, you must choose one. This option is particularly suitable for property owners who finance the renovation entirely from their own funds and have a high tax burden. From 2025, new model certificates are intended to simplify the tax handling further.
Step-by-step guide to optimal financing
A structured approach is key to success. Follow these four steps to secure the best possible financing for your façade insulation:
Obtain energy consultancy: Hire a certified energy efficiency expert. They will assess your project, create the necessary refurbishment roadmap (iSFP) for the higher grant rate, and confirm the technical requirements.
Compare quotes: Obtain at least two to three quotes from specialist companies for the insulation work. Compare not only the price but also the proposed materials and scope of services.
Apply for funding: Submit the application for a grant (BAFA) or loan (KfW) before signing a contractor agreement or ordering materials. The contract should include a contingency clause linking it to the funding approval.
Secure financing and implement: After securing funding approval, finalize the loan agreement, for example, a solar loan, if you are combining insulation with photovoltaics. Only then should construction work begin.
This systematic planning ensures that you don’t miss deadlines and maximize all financial benefits.
Expert tips for maximum savings
To fully exploit the potential of your financing, you should be aware of some advanced strategies. Our expert tip: Combine measures to increase funding limits. If you insulate the roof or install new windows in addition to the façade, you can set the eligible costs for each individual measure separately, thereby maximising the total funding. An eco-loan for sustainable investments can be a sensible complement in this context. Also, consider the U-value: for funding, the thermal transmittance of the new insulation must not exceed 0.20 W/(m² K). Generous limits apply to listed buildings. Long-term planning, such as a building society savings contract for future renovations, can also provide financial security and facilitate implementation.
Conclusion: An investment that pays off multiple times over
Financing facade insulation is a smart decision for the future of your property. It not only sustainably reduces your energy costs by up to 40 percent but also increases living comfort and the value of the building. By cleverly combining BAFA grants, KfW loans, and tax advantages, the initial investment costs of up to 20,000 euros for an average single-family home can be significantly reduced. Professional advice helps you find the optimal financing mix for your project and take advantage of all funding opportunities. This makes energy-efficient refurbishment an economically attractive undertaking.
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More useful links
The KfW provides detailed information on funding for facade insulation as part of energy-efficient refurbishment of existing properties for private individuals.
The Federal Environment Agency provides current data on energy consumption for buildings as an important environmental indicator.
On Gesetze im Internet you will find the full text of the Building Energy Act (GEG), which regulates the energy requirements for new buildings and renovations.
The Consumer Centre offers comprehensive information on insulation of the roof, facade, and cellar to effectively save energy.
The Federal Statistical Office (Destatis) provides tables on the energy consumption of private households.
The German Energy Agency (dena) offers a modernisation guide with valuable tips for energy-efficient refurbishment.
The Federal Ministry for Economic Affairs and Climate Action (BMWK) answers frequently asked questions about insulation.
The Federal Environment Agency offers a document with questions and answers on the topic of insulation.
FAQ
What is the subsidy for façade insulation?
You receive a basic grant of 15 percent from BAFA. With an individual renovation roadmap (iSFP), the grant increases to 20 percent of the eligible costs, up to a maximum of 60,000 euros, which corresponds to funding of up to 12,000 euros.
What loans are available for facade insulation?
The KfW offers the supplementary loan (358/359) with up to 120,000 euros, which can be combined with the BAFA grant. Alternatively, there is the KfW 261 loan with repayment grants for complete refurbishments.
Do I need to hire an energy consultant to receive the funding?
Yes, involvement of a certified energy efficiency expert is a mandatory requirement for applying for the Federal Funding for Efficient Buildings (BEG). The costs for this consultation are also subsidised at 50 percent.
What is the iSFP bonus?
The iSFP bonus is an additional incentive for funding. If the façade insulation is part of an individually prepared renovation schedule (iSFP), the subsidy rate increases from 15 to 20 percent and the eligible costs rise from 30,000 to 60,000 euros.
Can I deduct the façade insulation from my taxes?
Yes, as an alternative to BAFA/KfW funding, you can deduct 20 percent of the renovation costs (up to a maximum of 40,000 euros) from your taxes over three years. However, combining this with other funding options is not allowed.
What are the technical requirements for the funding?
To be eligible, the insulated facade must achieve a thermal transmittance (U-value) of a maximum of 0.20 W/(m²K). Different, less stringent requirements apply to listed buildings.
