Building savings contract for renovations: secure fixed interest rates and make costs predictable
06/07/2025
6
Minutes
Katrin Straub
Managing Director at nextsure
The cost of a refurbishment can quickly run into tens of thousands of euros. A home savings contract offers a tried-and-tested way to hedge against rising interest rates and make future projects more predictable. Find out how you can use the advantages of a home savings contract for future refurbishments and gain financial security.
The topic in brief and concise terms
A building savings contract secures you a fixed loan interest rate for future renovations, regardless of market fluctuations.
For loans under €50,000, a building society loan is often cheaper than a conventional bank instalment loan.
Government incentives such as the housing construction premium and the employee savings allowance increase the return on your building savings contract.
Renovation cost trap: Why forward-looking financial planning is crucial
The need for renovation rarely comes as a surprise, but the costs often do. A new heating system can quickly cost €15,000, and a roof renovation even more than €30,000.
In recent years, material costs have risen by more than ten per cent, further increasing the financial burden. Without a solid financial plan, a renovation project quickly becomes a financial risk.
Many owners underestimate the total costs by up to 20 per cent. The Buildings Energy Act (GEG) also prescribes minimum energy standards, which can incur additional costs.
Early, structured financing planning is therefore not a luxury, but an absolute necessity for preserving the value of your property. The right strategy protects you from unpleasant surprises and creates a solid foundation for your project.
Creating interest rate certainty: How a building savings contract works as a financial anchor
A building savings contract is, at its core, a two-phase savings and loan model. In the savings phase, you pay money in regularly until you have reached a minimum balance of usually 40 or 50 per cent of the building savings sum.
After that, the contract becomes „eligible for allocation“ and you receive your savings plus a loan at an interest rate that was fixed when the contract was signed. This fixed rate is the greatest advantage in an environment of rising market interest rates.
While banks often charge interest surcharges of two to four percentage points for loans under €50,000, the building savings loan rate remains unchanged. This guaranteed interest rate offers unique planning certainty for years ahead.
With this kind of protection, you can plan your affordable property financing long term. But it is not only the fixed rate that makes the model attractive; government subsidies can also noticeably improve the return.
Make use of government grants: How to maximise your returns
The state supports building-society savers with various incentives that flow directly into your contract. These grants significantly improve the effectiveness of your savings process and shorten the path to allocation maturity.
The most important incentives include:
Housing Construction Premium (WoP): Single people receive a premium of ten per cent on annual payments of up to 700 euros, which corresponds to 70 euros per year. For married couples, the amounts double to 1,400 euros in payments and 140 euros in premium.
Employee Savings Allowance: If your employer pays capital-forming benefits (VL), you can pay them directly into the building savings contract and receive additional state support.
Wohn-Riester: Riester savers can receive allowances of up to 175 euros a year, which can be used for housing-related purposes.
Our expert tip: Check the income limits for each incentive carefully so you do not lose your entitlement. Combining several incentives is often possible and can significantly increase the financial benefit.
These grants make the building savings contract even more attractive, but how does it compare directly with a standard loan?
Weigh up alternatives: building savings contract versus renovation loan
A home improvement loan from a bank is often available more quickly than a building society loan. However, the interest rates are often variable or linked to current market conditions, which entails an interest rate risk.
The key advantage of the building society loan lies in the fact that no land register entry is required for sums up to €50,000. This saves notary fees and speeds up processing after allocation.
A home improvement loan without a land register entry is also available from banks, but usually at a higher interest rate.
A building society savings contract is suitable for planned projects, while a bank loan is better suited to short-term needs. The long-term security of the building society savings contract is contrasted with the flexibility of the loan.
Despite the convincing advantages, there are aspects that should be critically reviewed before taking out one.
Recognising potential disadvantages: When a building society savings contract is less suitable
The biggest weakness of a building society savings contract is the low interest paid on the savings during the saving phase. With interest rates of around 0.1 per cent, the return is often well below the inflation rate.
In addition, a fee of usually 1 to 1.6 per cent of the building society savings sum is charged when the contract is concluded. For a sum of €50,000, that is still €500 to €800 in initial costs.
The allocation of the loan cannot be planned to the exact day, as it depends on the so-called assessment number. Those who rely on quick availability could run into limits here.
It is therefore important to monitor and assess the current building loan interest rate trends. However, anyone who opts for the model can tailor it optimally to their needs with a few tips.
Strategic approach: Four expert tips for your building savings contract
To make the best possible use of the benefits of a home savings contract for future renovations, a well-considered approach is required. With the right strategy, your contract becomes a precisely tailored tool for your goals.
Follow these four steps for optimal use:
Choose a realistic contract amount: Calculate the expected renovation costs and choose a contract amount that matches them. An amount between €30,000 and €50,000 is ideal for most modernisation projects.
Choose the tariff that suits your goal: Opt for a tariff whose savings and loan phases fit your timetable. Some tariffs are designed for rapid saving, others for low repayment rates.
Use special repayments: As soon as you are in the loan phase, you can make free special repayments at any time to pay the loan back faster and save on interest costs.
Combine financing cleverly: For larger projects, such as a roof renovation with solar installation, the home savings contract can cover part of the financing, while a KfW loan takes care of the rest.
Our expert tip: Do not be deterred by high arrangement fees; instead, calculate the effective benefit of the guaranteed low interest rate over the entire term.
A well-planned home savings contract is more than just a savings product; it is a strategic instrument for the long-term preservation of your property’s value.
More useful links
Wikipedia offers a comprehensive article on building savings contracts, explaining their basics, how they work and various aspects.
The KfW-Bankengruppe provides detailed information on support for existing properties for private individuals.
FAQ
What costs are involved with a building savings contract?
The most common costs are the closing fee, which is between 1 and 1.6 per cent of the savings contract sum, and possible account management fees. The closing fee is offset directly at the start against the first savings instalments.
How high should the building savings sum be for a refurbishment?
The home savings sum should be based on the expected costs of your planned measures. For typical modernisations such as a new bathroom or heating system, amounts between €15,000 and €50,000 are a good guideline.
Can I cancel my home savings contract early?
Yes, you can cancel your home savings contract at any time during the savings phase. The notice period is generally three to six months. However, please note that if you cancel early, any state subsidies received may have to be repaid.
What is the difference between the nominal interest rate and the effective annual interest rate on a building society loan?
The nominal interest rate indicates the pure interest costs for the loan. The effective interest rate also takes into account other costs such as the arrangement fee and therefore reflects the actual financial burden more accurately. Therefore, always pay attention to the effective annual percentage rate.
Do I need to be entered in the land register for a home savings loan?
For building society loans of up to EUR 50,000, an entry in the land register is usually not required. This saves you the associated notary and court costs.
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