Secure financing for the installation of soundproof windows: your path to more peace and quiet
30/04/2025
12
Minutes
Katrin Straub
Managing Director at nextsure
Constant noise from outside not only reduces your quality of life, but can also put a strain on your health. Investing in soundproof windows is an effective solution, but many people are put off by the cost. We’ll show you how to secure financing for the installation of soundproof windows and benefit from attractive government grants.
The topic in brief and concise terms
Government subsidies (BAFA/KfW) can reduce the cost of soundproof windows by 15 to 25 percent if energy efficiency standards are met.
Alternatively, 20 per cent of the renovation costs (up to 40,000 euros) can be deducted from tax over three years.
Modernisation loans of up to €50,000 are often available without a land registry entry and offer a flexible financing solution.
Noise as a cost factor: Why investing in soundproof windows pays off
Persistent noise can significantly disturb well-being and affect health. In purely residential areas, the daytime emission limit is 55 decibels (dB(A)). An investment in soundproof windows is therefore more than just an added comfort. Windows of sound insulation class 4 can reduce the noise level by 40 to 44 decibels. This turns a busy main road with 70 decibels into a quiet whisper in the living space. The increase in the value of your property is another positive side effect that is often underestimated. A quiet residential location can increase market value by up to ten per cent. The next step is to explore the various financing options.
Making the most of government funding: KfW and BAFA grants
The state supports the installation of energy-efficient windows, which often also includes sound insulation. The Federal Office for Economic Affairs and Export Control (BAFA) supports individual measures with a grant of 15 per cent. If window replacement is part of an individual renovation roadmap (iSFP), the grant increases to 20 per cent. For a comprehensive renovation to an efficient house, the Kreditanstalt für Wiederaufbau (KfW) offers loans of up to 150,000 euros in programme 261 with a repayment subsidy of up to 25 per cent. A certain U-value for the windows is usually required for funding, and this often has to be no higher than 0.95 W/(m²K). A suitable property finance can perfectly complement these programmes. Applying requires careful planning and often the involvement of an energy efficiency expert.
Tax deductibility: Save up to 20 per cent of the costs
An attractive alternative to direct funding is tax deductibility. You can deduct 20 per cent of the expenses for window replacement from your tax liability. This applies to material and labour costs up to a maximum of €200,000 per residential property, which corresponds to a maximum tax saving of €40,000. The tax reduction is spread over three years. The following conditions must be met:
The building must be at least ten years old when renovated.
You must live in the property yourself.
The work must be carried out by a specialist company.
You may not claim any other government funding (such as KfW or BAFA) for the same measure.
It is important that you keep a correct invoice and proof of transfer. This tax relief makes the financing of new windows even more accessible and predictable. Next, we look at flexible loan options.
Alternative financing options: home improvement loans and building society savings contracts
State funding does not always suit the individual situation. A modernisation loan is a flexible alternative here. Banks often grant such loans of up to 50,000 euros without entry in the land register, which saves time and notary fees. The interest rates are generally more favourable than for a standard instalment loan, as the investment serves to preserve the property’s value. Another tried-and-tested method is the home savings contract. With a home savings contract, you secure fixed, low loan interest rates for the future. During the savings phase, you build up equity and receive a favourable home savings loan once allocated. This method is particularly suitable for renovations planned in the long term. The right household budget calculation before applying for a loan creates a solid basis for discussions with the bank.
Legal basis and claims in the event of noise pollution
The Federal Immission Control Act (BImSchG) sets out the legal framework for noise protection in Germany. For purely residential areas, guideline values of 55 decibels during the day and 40 decibels at night apply. If these values are exceeded by traffic noise, local residents may, under certain circumstances, assert claims for noise mitigation measures. In the case of railway noise, infrastructure providers partly reimburse up to 75 per cent of the costs for passive soundproofing measures such as the installation of soundproof windows. Tenants can demand a rent reduction of five to ten per cent in the event of significant noise disturbance that can be proven to be above the limit values. However, before you initiate legal action, a precise analysis and the application for funding is the first step.
Step by step: How to secure your financing
A structured approach is the key to success. With the right steps, you can secure the optimal financing for your new soundproof windows. Here is a simple guide:
Obtain quotes: Obtain at least three quotes from specialist companies. Pay attention to the exact specification of the windows (sound insulation class, U-value).
Check funding options: Clarify whether you are eligible for BAFA grants or KfW funding. An energy efficiency expert can help with this and is often a prerequisite.
Weigh up the tax advantage: Compare the level of funding with the potential tax saving of 20 per cent.
Compare loan options: Check the terms for an loan with unrestricted use or a purpose-bound modernisation loan.
Submit applications: Be sure to submit funding applications before work begins.
With this clear strategy, you can turn the desire for peace and quiet into a financially viable reality. Our service for Home & Living supports you in this. Request your personalised risk analysis now: Have your insurance situation checked free of charge and receive specific suggestions for optimisation.
More useful links
Deutsche Bahn provides information on passive noise protection for buildings, especially in the context of railway noise.
The KfW presents its funding programmes for the energy-efficient refurbishment of windows in existing properties.
Information on the soundproof window programme of the City of Berlin is available on its website.
The Federal Environment Agency offers an environmental indicator on the noise exposure of the population in Germany.
You can also find a comprehensive topic page on noise at the Federal Environment Agency.
The Consumer Advice Centre provides advice on planning windows during energy-efficient refurbishments, including comfort and burglary protection aspects.
FAQ
How much do soundproof windows cost?
Costs vary greatly depending on material, size and sound insulation class. A plastic window (1.3 x 1.3 m) in sound insulation class 3 costs around 450 euros, while class 4 starts at about 500 euros. Timber-aluminium windows are more expensive at around 680 euros.
Can I, as a tenant, request the installation of soundproof windows?
There is no direct right to have it installed. However, if the noise pollution can be proven to be permanently above the statutory limit values, you can claim a rent reduction or negotiate with the landlord about a modernisation measure, which may also benefit them through a possible rent increase.
What U-value is required for funding?
To receive funding from BAFA or KfW, the thermal transmittance coefficient (U-value) of the entire window must not exceed 0.95 W/(m²K). For roof windows, the limit is 1.0 W/(m²K).
What happens if I apply for funding and then do not carry out the measure?
An approved but undrawn grant will generally lapse without consequences. In the case of a loan agreement, depending on the bank and the timing of the withdrawal, commitment fees or a non-utilisation charge may apply. Check the contract terms carefully.
Can I also use the tax incentive for a holiday home?
No, the tax relief under Section 35c of the German Income Tax Act (EStG) applies only to properties that you use exclusively for your own residential purposes. Holiday homes or rented properties are excluded.
Are there any special funding schemes for noise protection along railway lines or at airports?
Yes, for residents living near noisy transport routes such as railway lines, there are often special noise remediation programmes. Deutsche Bahn or the airport operators offer grants of up to 75 per cent for passive soundproofing measures under certain conditions.
