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Construction defects
Substitute performance for construction defects: when clients may instruct a third party
When instructing a third party after construction defects is risky and which documents matter before claiming the costs.
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5 July 2026 · Mag. Bernhard Brandauer, Rechtsanwalt
When defects are not repaired, clients often want to instruct another contractor and pass on the costs. That step is legally sensitive because it changes the evidence and may make later recovery harder.
Substitute performance for construction defects therefore needs careful preparation. Defect records, a clear request for repair, reasonable response time and a precise third-party offer are central.
The technical solution is only one side. The legal chronology must also be clear so that the later claim is not weakened by missing documents.
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What is the main issue right now?
The assessment helps distinguish prevention, evidence and response.
All paths at a glance
Overview of all answers.
With complete documents, the legal position can be assessed precisely.
If a dispute already exists, chronology and records matter. They determine whether payment, reservation, repair or enforcement is sensible.
The key is the connection between contract, actual progress and documented statements.
Missing evidence should be preserved first.
If documents are missing, request and secure them immediately.
Photos, minutes, emails and invoices help make the facts reliable.
Distinction from existing construction-law topics
Distinction from existing construction-law topics
This article focuses on the step after an unsuccessful repair attempt. It does not repeat the general warranty guide, but explains evidence, notice and cost risk before a third party is instructed.
The existing core pages, tools and checklists remain the broader context; this article focuses on the narrower user situation.
This avoids repeating the same legal core in several places.
What substitute performance is about
What substitute performance is about
The starting point is usually a construction contract and the question whether a real defect exists. Austrian warranty law distinguishes repair, replacement, price reduction and rescission; damages may also matter.
Substitute performance is sensitive because the repair changes the facts. After the work is done, proving the original condition and cause can become much harder.
Before instructing another contractor, clients should check whether the original contractor was clearly asked to repair and had a reasonable chance to respond.
How this differs from a defect notice
How this differs from a defect notice
A defect notice describes what is wrong. Substitute performance is a later escalation step if repair is refused, fails or becomes unreasonable.
The general warranty article explains the remedies. This article is narrower: it explains how the practical step of third-party repair should be prepared.
Dissatisfaction alone is not enough. The defect, the records and the cost basis must be concrete.
Documents to collect before instructing a third party
Documents to collect before instructing a third party
Key documents include the contract, specifications, plans, photos, minutes, correspondence, defect list and the request for repair. Third-party offers should clearly cover defect repair only.
If several defects appear together, each item should be described separately. Otherwise it becomes unclear which cost belongs to which defect.
A short timeline helps: handover, first discovery, notification, contractor response, expiry of time and planned repair.
Typical mistakes before substitute performance
Typical mistakes before substitute performance
A common mistake is repairing too quickly without preserving the condition. It is also risky to combine necessary repair with upgrades or wishes.
A merely oral or vague request may weaken cost recovery. The contractor must understand what is criticised and what response is expected.
For major costs, an expert opinion or legal letter should be considered before the evidence is changed permanently.
How clients should proceed
How clients should proceed
First preserve the condition with photos, minutes and, where useful, expert input. Then ask the original contractor in writing to carry out a specific repair.
Only if the response is missing, refused or insufficient should the third-party offer be assessed. The order should define which works are defect repair.
After completion, invoice, payment proof and photo documentation should match. This makes later settlement or litigation easier.
Key checks
The key questions at a glance
The table shows which issues should be separated in the first assessment.
| Review area | What it concerns | Why it matters |
|---|---|---|
| Defect Technical fault, cause and affected area | Without a clear defect, cost recovery is uncertain | |
| Notice Written repair request with reasonable response time | Shows that third-party instruction was not premature | |
| Costs Offer and invoice limited to necessary repair | Prevents disputes about upgrades or additional wishes |
This assessment does not replace case-specific advice, but helps prepare the documents.
Process
A safe practical sequence
A short sequence helps preserve evidence and legal position at the same time.
- 0101
Collect documents
- 0202
Define the issue
- 0303
Plan the response
Practical tip: Do not respond in general terms. Link each statement to specific documents, amounts and open issues. Book an initial consultation (72 euros)
FAQ
substitute performance for construction defects
Can I immediately instruct another contractor? +
Usually the defect should first be documented and the original contractor asked to repair. Urgent cases need particularly strong documentation.
Do I need to set a deadline? +
In many cases a written opportunity to respond is important. The reasonable time depends on the defect, urgency and project phase.
Can I recover all costs? +
Only costs that are legally and factually linked to necessary defect repair are recoverable. Upgrades and additional wishes must be separated.
Further reading
Related construction-law topics
Construction contract and remuneration
Überblick page on contract, performance, payment and typical construction disputes.
Construction defects and warranty
Überblick page on defects, repair, price reduction and preserving evidence.
Construction litigation and evidence
How documents, expert evidence and litigation risk interact in construction disputes.
Construction project risk analysis
Interactive risk check for clients before signing, paying or escalating.
Topics
Substitute performanceConstruction defectsRepairCost recoveryEvidence
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