Warranty bond in construction projects: securing liquidity and minimising risks in Germany
12.10.2025
7
Minutes
Katrin Straub
Managing Director at nextsure
A construction project is complete, yet five per cent of the contract sum remains blocked as retention. This ties up capital that you need for new growth. A defects liability bond provided by an insurer solves this problem while also securing your client’s claims for defects.
The topic in brief and concise terms
A warranty bond replaces the usual five per cent retention and ensures immediate liquidity for the contractor.
The cost of the surety bond is between 0.7 and 2.5 per cent of the sum insured, well below the benefit of the capital released.
The warranty periods differ depending on the contractual basis: five years under the BGB and, as a rule, four years under the VOB/B.
The foundation of security: Understanding the function of a warranty bond
A warranty bond secures claims for defects after acceptance of the construction work. Instead of a retention of security of usually five per cent of the contract sum, an insurer acts as surety. This guarantees the client that defects will be rectified even if the construction company becomes insolvent. In return, the contractor receives 100 per cent of the final invoice paid out immediately. This practice is established in the construction industry, plant engineering and among trades businesses. The legal framework for this is set out in the German Civil Code (BGB) and the German Construction Contract Procedures (VOB/B). This turns tied-up capital into an active liquidity advantage. The bond certificate is typically handed over to the client together with the final invoice. This mechanism creates a reliable basis for planning for both contracting parties.
Unlock liquidity: The direct financial advantage of surety insurance
The greatest advantage of the warranty bond lies in the immediate improvement in liquidity. Instead of waiting four or five years for the retention to be released, the money is available straight away. The cost of the bond, a so-called aval fee, is often only between 0.7 and 2.5 per cent of the bond amount per year. An example calculation: with a contract sum of 200,000 euros, the retention amounts to 10,000 euros. The annual costs for a bond over this sum could, at one per cent, be only 100 euros. This small amount frees up the full 10,000 euros for investments or new projects. Solid construction financing is made much easier by this free cash flow. In addition, there is no risk that the client will become insolvent and be unable to pay out the retention themselves. The bond is therefore a strategic instrument for financial optimisation.
The two sets of rules: understanding the differences between the BGB and VOB/B
Warranty periods and conditions depend on the underlying contractual framework. The German Civil Code (BGB) and the German Construction Contract Procedures and Contract Rules for Building Works (VOB/B) set different standards. The choice of framework has a direct impact on the term of the bond. VOB/B is not a statutory regulation; it must be expressly agreed in the construction contract. For construction owners, comprehensive construction owner’s liability insurance is essential in both scenarios. The key differences are:
Warranty period: Under the BGB, you are liable for defects in structures for five years; under VOB/B, usually four years.
Acceptance: VOB/B contains detailed provisions on formal acceptance, which precisely define the start of the warranty period.
Notice of defects: VOB/B often imposes shorter deadlines for the client's notice of defects.
Limitation period for remedial work: Under VOB/B, a new limitation period of two years begins for rectified parts.
These differences determine the required term and therefore also the cost of your warranty bond.
Analysing cost factors: Choosing the right surety insurance
The cost of a warranty bond varies depending on the provider and the company’s creditworthiness. Insurers are often a cheaper alternative to bank guarantees, which can cost up to five per cent. An insurer usually charges between 0.75 and two per cent of the bond amount as an annual premium. The creditworthiness of your company is the key factor for favourable terms. A company with solid finances often pays less than one per cent. Good protection for your Haus & Wohnen project starts with choosing the right partner. When making your selection, note the following steps:
Compare quotes: Obtain at least three quotes from specialised surety insurers.
Check the master agreement: A bond facility for several projects is often cheaper than many individual bonds.
Read the terms: Look for a waiver of the “benefit of discussion”. This allows the surety to be called upon directly.
Prepare for the credit check: Have current management accounts (BWA) ready to demonstrate your strong financial position.
A careful selection lowers the annual costs and ensures the bond is accepted by the client.
Expert tips for practical use: Avoid common pitfalls with confidence
In practice, the details determine the effectiveness and costs of a warranty bond. A common mistake is accepting unfavourable wording in the bond document. Our expert tip: Under no circumstances should you accept bonds “on first demand”. This clause obliges the guarantor to make immediate payment at the client’s request, without the defect having to be proven. This represents a considerable risk. Another important safeguard is contract works insurance, which covers damage during the construction phase. Also pay attention to the guarantor’s reputation; a bond from a financially weak provider may be rejected by the client. In addition, make sure the bond document is returned on time after the warranty period expires, to stop unnecessary premium payments. A simple calendar entry can save several hundred euros here.
The worst-case scenario: Proper handling when defects occur
If a defect occurs within the warranty period, the client must first notify the construction company of it. They must set a reasonable deadline for the defect to be remedied. If the contractor does not comply with this obligation, for example due to insolvency, the client can make a claim under the bond. The insurer reviews the case and pays the agreed sum to the client. With this money, the client can commission another company to rectify the defects. The insurer will then reclaim the amount paid from the original contractor. A shell construction fire insurance provides parallel protection against unforeseen events during the construction phase. The clear separation of responsibilities ensures a structured process. Request an individual risk analysis now: Have your insurance situation checked free of charge and receive concrete optimisation suggestions.
More useful links
The Federal Statistical Office (Destatis) provides tables and data on the construction industry on this page.
The Federal Gazette offers an official publication here.
The Bundesbank publishes statistics on interest rates for residential construction loans to private households in Germany on this page.
Laws on the Internet provides access to the German Civil Code (BGB).
The Federal Ministry for Economic Affairs provides an overview and the legal basis for the awarding of contracts.
The VDB (Association of German Guarantee Banks) provides information on guarantees on its website.
FAQ
What is a warranty bond for a construction project in Germany?
It is the guarantee of an insurer or bank to cover defects in a structure that arise after acceptance. It replaces the usual retention of around five per cent of the contract sum, which the client would otherwise withhold until the end of the warranty period.
What benefits does the surety bond offer the contractor?
The main advantage is the immediate payment of the full contract amount. This significantly improves liquidity and cash flow. In addition, there is no risk that the client will be unable to repay the retention due to their own insolvency.
What is the difference between a surety under the BGB and VOB/B?
The essential difference lies in the duration of the warranty period. Under the German Civil Code (BGB), it is five years for structures. If the German Construction Contract Procedures (VOB/B) are contractually agreed, the period is usually reduced to four years.
Can a client reject a warranty bond?
Yes, if the surety does not comply with the contractual agreements or if the guarantor (the insurer) does not appear sufficiently creditworthy. Therefore, it is important to choose an established insurer with strong financial backing as a partner.
What does a “guarantee on first demand” mean?
This clause means that the guarantor must pay upon the mere demand of the principal, without examining the validity of the claim in detail. For the contractor, this is very risky and should be avoided wherever possible.
How do I terminate a warranty bond?
The guarantee ends automatically on expiry of the warranty period. To stop premium payments, the original guarantee certificate must be returned to the insurer. Actively request this from your client.
