Financing a new roof: Compare loans and optimize costs
8 May 2025
11
Minutes
Katrin Straub
CEO at nextsure
A new roof installation is a significant investment, often costing over €25,000. Choosing the right loan is crucial to saving thousands of euros in interest. We will show you how to optimise the financing of a new roof installation with a loan comparison and make use of government subsidies.
The topic in brief and concise terms
The costs for a new roof covering with insulation range from 200 to 300 Euros per square meter.
A modernization loan is often cheaper than an installment loan and can be obtained up to 50,000 euros without a land registry entry.
Government subsidies (BAFA/KfW) can reduce costs by up to 20 percent or more.
Cost analysis: These expenses await you with a new roof covering
The costs for a new roof covering vary greatly depending on the scope and material. A simple re-roofing without insulation costs between 100 and 150 euros per square metre. For a 150-square-metre roof, this results in costs of at least 15,000 euros. If an energy-efficient on-rafter insulation is also installed in accordance with the Building Energy Act (GEG), costs increase to 200 to 300 euros per square metre. The total costs for such a project can then quickly reach 30,000 to 45,000 euros.
The following items make up the majority of the costs:
Materials: The choice of roofing significantly influences the price. Concrete roof tiles are a cost-effective option at 25 to 35 euros per square metre, while high-quality slate tiles can cost up to 80 euros.
Labour costs: The labour costs for roofers account for about 40 to 50 percent of the total costs and depend on the complexity of the roof.
Insulation: Intermediate rafter insulation costs around 30 to 35 euros per square metre. It reduces later heating costs by up to 20 percent.
Additional costs: Items such as scaffolding, disposal of old material (especially asbestos), and the installation of roof windows can increase costs by another 5,000 to 10,000 euros.
Careful planning of these expenses is the first step in determining the appropriate loan amount and developing the optimal financing strategy.
Credit options at a glance: instalment loan, modernization loan, and building savings loan
There are mainly three types of loans available for funding your new roof covering. The classic instalment loan is unrestricted and quickly available, often within 24 hours. However, the interest rates, ranging from four to eight percent, are comparatively high. It is suitable for amounts up to around 50,000 euros and does not require registration in the land register.
The modernisation loan is earmarked and therefore more favourable in terms of interest. Banks often offer it with interest rates between three and six percent. Many institutions also grant modernisation loans up to 50,000 euros without the expensive entry in the land register. You merely need to prove that you will use the sum for the property.
A building society loan is another alternative, especially if you are planning the renovation in the long term. It combines a savings phase with a later, low-interest loan. This option offers high interest security but requires more lead time. The right choice depends on your financial situation and the project's time horizon.
Government subsidies: How to reduce the loan amount by up to 20 percent
Before signing a loan agreement, you should check for government grants. The Federal Office for Economic Affairs and Export Control (BAFA) and the Reconstruction Loan Corporation (KfW) offer attractive grants and loans. For individual measures such as roof insulation, BAFA provides a grant of up to 20 percent of the eligible costs. For investment costs of 30,000 euros, this corresponds to a grant of 6,000 euros.
KfW supports energy refurbishments with low-interest loans and repayment grants. Under the program “Residential Building – Loan (261)” you can receive a loan of up to 150,000 euros for a comprehensive renovation to an efficiency house. The repayment grant can be up to 45 percent, which significantly reduces the amount to be repaid. The involvement of a certified energy efficiency expert is a prerequisite for most grants.
Additionally, since 2024, KfW offers a supplementary loan (358/359) of up to 120,000 euros for already subsidised individual measures. A combination of BAFA grant and KfW loan is often possible, maximising your savings. This allows you to cleverly manage the financing. Carefully examining the conditions is crucial to selecting the right type of loan.
Expert Tip: Negotiate loan terms smartly and save in the long run
A good interest rate on a loan is only part of the equation. When comparing loans for your new roof, pay attention to flexible repayment options. Free special repayments are a crucial leverage to shorten the loan term and save on interest costs. Even an annual special repayment of just five percent of the loan amount can reduce the term by several years.
Compare the overall effective interest rates of different providers, as these include all the costs of the loan. Even a difference of one percentage point in the interest rate can mean savings of over 1,500 euros on a loan amount of 30,000 euros over ten years. Use online comparison portals to get an initial overview, but also have direct discussions with banks. Sometimes, a better interest rate can be negotiated in face-to-face conversations, especially if you can offer additional security.
Our expert tip: Explicitly ask about the possibility of payment holidays. If an unforeseen financial shortfall occurs, the option to skip one or two installments can provide valuable flexibility. A well-thought-out monitoring of interest rate trends helps you find the right time to secure your loan. This way, you not only ensure a cost-effective but also a flexible financing for your roof.
Conclusion: A systematic comparison leads to optimal financing
Funding for a new roof is a complex decision with long-term financial implications. Costs can quickly exceed 45,000 euros, depending on the scope. Therefore, a systematic comparison of different financing options is essential. A dedicated renovation loan often offers the best conditions, with interest rates that can be up to three percentage points lower than those of a regular installment loan.
Always combine your loan with state subsidies from BAFA and KfW. A grant of 15 percent or more is realistic for energy-efficient measures and directly reduces the required loan amount. Pay attention to flexible terms in the loan agreement, like special repayments, to become debt-free faster. Careful planning and a detailed comparison ensure you get the best possible financing and save several thousand euros over the term.
Now request an individual risk analysis: Have your insurance situation reviewed for free and receive concrete optimization suggestions.
More useful links
Die KfW offers detailed information on funding for energy-efficient renovation, particularly for roof insulation.
The Federal Statistical Office (Destatis) provides current data on construction prices and real estate price indices.
The consumer advice centre offers a comprehensive guide to finding suitable funding programmes for your home.
Finanztip provides information on various grants that can be used for roof renovation.
Die KfW explains the supplementary loan for individual measures on residential buildings.
The consumer advice centre provides information on the benefits of thermal insulation for the roof, facade, and basement for energy saving.
FAQ
How long does it take to pay out a modernisation loan?
If no land register entry is required, the disbursement of a modernization loan usually takes place within four to five working days after approval and submission of all documents.
Do I need to prove equity for a renovation loan?
For a modernisation loan, explicit proof of equity is generally not required as long as your creditworthiness is sufficient for the loan amount. However, equity can improve the loan conditions.
Can I also use a loan for roof repairs?
Yes, an installment loan or a modernization loan can also be used for minor roof repairs. However, government grants are generally only available for comprehensive energy renovations.
What happens if the roofing costs exceed the loan amount?
If the costs exceed the loan amount, you must cover the difference with your own funds. Alternatively, you can request an increase in the loan from your bank, although this will require a new credit check.
What documents do I need for a modernization loan?
You will usually need your last three payslips, a copy of your ID card, and proof of ownership of the property (e.g., a land register extract).
Can I deduct a roof renovation from my taxes?
Yes, tradesman services for renovation and maintenance work can be claimed for tax purposes. You can deduct 20 percent of the labour costs (up to a maximum of 1,200 euros per year) from your tax bill. Alternatively to BAFA/KfW funding, you can spread the tax deduction for energy-efficient refurbishment measures over three years, covering a total of 20 percent of the costs.
