After the purchase defects occur. The matter cannot be handled with the developer as expected; insolvency proceedings or other serious difficulties are looming. You know individual contracting companies and want to call them directly to remedy the defects. Before that, it must be clarified on which legal basis you can act.
Recognise the intended statutory route
§16 BTVG opens, under the conditions stated there, a request for assignment of the warranty and damages claims that the developer has against third parties due to defective performance. It also describes the transfer of rights by receipt of the written request directed at that effect. [ANSPRUCH]
This is not a blanket assertion that every purchaser at any time has all claims against every company working on the construction site. Scope of application, existing claims, parties involved and the required procedure must be examined by experts. The article does not contain a usable assignment request.
Distinguish between your own contractual relationship and another party's contract
Compile what you yourself agreed with whom and which contracting companies are known only from the developer's documents. A company name on a component does not yet prove any specific contractual or liability scope. An invoice to the developer is also not, without examination, your own direct instruction.
Our editorial recommendation: assign each known defect to the affected service and the documents available. Technical cause, responsible scope of work and legal claim must be clarified separately. A photograph alone does not fully connect these questions.
Fictional case: The known firm rejects a blanket demand
A purchaser finds water at a component location and writes directly to the firm whose name he knows from an old project list. He demands comprehensive free repairs. Whether the firm owed the affected service at all to the relevant extent and which claims exist or have been assigned has not yet been examined.
He therefore has the findings, construction performance documents, developer contract and the status of enforcement against the developer jointly assessed. The example does not decide any responsibility. It shows why a known company name does not replace the required basis of claim.
Coordinate the legal and technical processing
For significant defects you need an appropriate technical determination and a timely legal classification of claims, declarations and deadlines. Inform the adviser about known insolvency or service problems and claims already made.
Do not rely on a general defects e-mail to automatically fulfil all statutory requirements or preserve all deadlines. The concrete transfer of rights and the rules applicable to third parties must be examined on the basis of the case. Even an assigned claim is not equivalent to a guaranteed payment success.
Your result should link the affected service, the possible claim and the actually appropriate route. This allows an assessment of whether and which claims against executing third parties can be used for your defect case. The developer's difficult accessibility is the reason for this examination, not an independent proof of any arbitrary third-party obligation.