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by Brandauer RA
Developer contract

Developer contract and the BTVG: recognising risks and securing advance payments

Buyers from a developer often pay in advance. When the BTVG applies, which security models exist, and what role the trustee plays.

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7 June 2026 · Mag. Bernhard Brandauer, Rechtsanwalt

Anyone who buys a flat or a house from a developer often pays before the property is finished. The greatest risk lies precisely in this phase: the buyer makes advance payments for a performance that is still to come. If something goes wrong on the developer side, such as insolvency, a great deal of money is suddenly at stake.

For this situation the legislator created the Developer Contract Act (Bauträgervertragsgesetz, BTVG). It applies where buyers pay more than EUR 150 per square metre of usable floor area before completion, and it protects through information, form and security obligations. This article explains when the BTVG applies, which security models exist, and what to look out for before signing.

From a lawyer’s perspective, much is decided at the drafting stage. Those who understand the payment plan, the security and the role of the trustee can recognise and hedge risks early. Those who sign without review often notice a gap only when matters have already become difficult.

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01 Question 1

Do you pay more than EUR 150 per square metre of usable floor area before completion?

The Developer Contract Act applies where buyers pay more than EUR 150 per square metre of usable floor area before completion. Information, form and security obligations then apply.

All paths at a glance

Overview of all answers.

01

Whether the BTVG applies depends on the amount and timing of your payments and should be examined.

The Developer Contract Act protects buyers where more than EUR 150 per square metre of usable floor area is to be paid in advance before completion. If the advance payments remain below this or only fall due after completion, the protection of the BTVG may not apply. You then bear the risk alone under the general rules.

Have the contract and payment plan examined before you sign. This shows whether the BTVG applies and what security you are entitled to.

02

Security is provided; now the details of the instalment plan and the trust arrangement matter.

Where security is provided and a trustee is named, you are in principle on the right track. The details remain decisive: for the instalment plan the BTVG distinguishes between instalment plan A with earlier payout and instalment plan B with stronger buyer protection and slower payout. The trustee may only release instalments once the progress of construction is confirmed.

Have it examined whether the individual instalments correspond to the actual progress of construction and how confirmation by an expert is arranged.

03

Where clear security or a named trustee is missing, there is an urgent need for review.

Without effective security and without a trustee named in the contract you lack central protective instruments of the BTVG. Particularly in the event of the developer becoming insolvent, advance payments without security may be lost. Insufficient or unclearly worded security also often fails to protect as it should when it counts.

Do not sign such a contract without review. A legal assessment quickly shows which security is missing and how it can be improved.

When the Developer Contract Act applies

The BTVG is not a general law of sale for real property. It applies specifically where buyers make advance payments to the developer before the property is completed. The central threshold: where more than EUR 150 per square metre of usable floor area is paid in advance before completion, the Act applies and unfolds its protection.

A simple idea lies behind this threshold. Anyone who pays in advance for a performance that is yet to arise needs protection against the risk that the performance will not be rendered, or not in full. The BTVG therefore obliges the developer to provide information, form and security so that the buyers’ advance-payment risk does not remain unprotected.

Whether the threshold is exceeded follows from the payment plan together with the agreed usable floor area. This calculation is not always obvious at first glance. It is worth working through the payment plan carefully before signing so that it is clear whether and from when the protection of the Act applies.

Information, form and security obligations

The BTVG protects on three levels. The information obligations are meant to ensure that the buyer knows what they are entering into before becoming bound. This includes details of the subject matter of the contract, of the payments and of the type of security. Missing or unclear mandatory details are a warning sign.

The form obligations concern the structure of the contract itself. The developer contract should record the essential points in writing and comprehensibly, from the scope of services through the payment plan to the security. This allows it to be checked later what was actually agreed if the building deviates from the target.

The security obligations are the centrepiece. They ensure that the buyers’ advance payments are protected if the developer fails to perform. Which security model is used must be set out in the contract. A detailed review of the whole contract is shown in the article on reviewing a construction contract before signing.

The security models at a glance

The BTVG knows several ways to secure the advance payments. First, contractual security, where a bank guarantee or insurance stands behind the payments made. Second, land register security in combination with an instalment plan, where registration in the land register and a payment plan tied to the progress of construction work together. Third, the pledge model.

In practice, land register security in combination with an instalment plan is the most common. It combines real-rights protection of your legal position with a payout mechanism that follows the actual progress of the building. The money thus flows in stages that are meant to correspond to the value being created.

Which model suits your case depends on the specific arrangement. What matters is that the security is validly agreed and actually takes effect when it counts. Insufficiently worded security often protects less than its name promises.

Instalment plan A and instalment plan B

Two instalment plans, two levels of protection

For land register security with an instalment plan, the BTVG distinguishes two variants. They distribute the relationship between payout and buyer protection differently.

Comparison of instalment plan A and instalment plan B under the BTVG regarding payout and buyer protection
Feature Instalment plan A Instalment plan B
Payout Tends towards earlier payout of instalments Instalments flow more quickly to the developer Instalments flow more slowly to the developer
Buyer protection Level of remaining risk Somewhat less security for the buyer Stronger protection for the buyer side
Construction progress Link to progress Instalments tied to building stages Instalments tied to building stages
Trustee Role in release Releases instalments on confirmed progress Releases instalments on confirmed progress

Which instalment plan is in the contract directly affects your risk. The choice should be made deliberately and with the specific building in mind.

The role of the trustee

The trustee is a central protective figure of the BTVG. It must be a lawyer or a notary, and it must be named in the contract. If this detail is missing, an essential element of the statutory protection is missing. The trustee stands between the parties and ensures that the buyers’ funds are used for their intended purpose.

Its core task is supervising the progress of construction. It releases the instalments only once the respective progress is confirmed. This confirmation is given by experts or chartered engineers who assess the actual state of the building. This is intended to prevent money from flowing out before the corresponding value has been created.

For you as the buyer this means an important control mechanism. Check whether the trustee is named and how confirmation of construction progress is arranged. These points help to decide whether the security holds when it counts.

A common mistake: anyone who pays instalments before construction progress is confirmed, or signs a contract without a named trustee, considerably weakens their own protection. Have the payment plan, the security and the trust arrangement reviewed before signing. Booking an initial consultation (EUR 72) can quickly show where a gap exists.

The typical risks in a developer contract

The greatest risk is the developer becoming insolvent. If the building is not completed, everything depends on whether your advance payments are effectively secured. Missing or insufficient security can mean that money already paid is lost. This is precisely what the BTVG is meant to protect against, which is why the security must be examined so carefully.

A second risk is deviations between the owed target condition of the building and what is actually erected. What was agreed follows from the plans, the scope of services and the building description. Where the building deviates from this, questions of warranty and damages arise, similar to construction defects after handover.

In addition, there is delay in completion and dispute over outstanding payments. Special rules also apply to refusing payment because of defects, which we address in the article on the remuneration claim and refusal of payment. An early legal assessment helps in choosing the right response.

Frequently asked questions

Developer contract and the BTVG.

From when does the Developer Contract Act apply to my purchase? +

The BTVG applies where you as the buyer pay more than EUR 150 per square metre of usable floor area in advance before completion. Information, form and security obligations then apply. Whether the threshold is exceeded follows from the payment plan and the usable floor area and should be calculated before signing.

Which security model is best for buyers? +

The BTVG knows contractual security via a bank guarantee or insurance, land register security in combination with an instalment plan, and the pledge model. In practice, land register security with an instalment plan is the most common. Which model suits your case depends on the specific arrangement and should be examined.

What is the purpose of the trustee in a developer contract? +

The trustee must be a lawyer or a notary and must be named in the contract. It supervises the progress of construction and releases the instalments only once the progress is confirmed. This confirmation is given by experts or chartered engineers. This prevents money from flowing out before the corresponding value has been created.

Topics
developer contractBTVGadvance paymenttrusteeinstalment plan

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