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Construction contract
Extension of time and delay notices: preliminary works and schedule
When construction dates slip, delay notice, preliminary works and schedule must be checked before costs and penalties escalate.
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6 July 2026 · Mag. Bernhard Brandauer, Rechtsanwalt
Construction delay often becomes visible only when the completion date is at risk. The cause is frequently earlier: missing preliminary works, late decisions or trades that are not coordinated.
Extension of time and delay notice should therefore be separated from the pure penalty topic. Before sanctions, the question is who actually influenced the sequence.
This article supplements the existing guide on delay and penalties. It focuses on the narrower situation where dates slip because of preliminary works, cooperation duties or sequence disruptions.
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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 penalties and completion delay
Distinction from penalties and completion delay
A penalty concerns the legal consequence of missing a date. A delay event concerns the cause why a date cannot be met.
Anyone looking only at the contractual penalty often misses the prior question of cooperation, preliminary works and sequence planning.
This article therefore does not assess the amount of a penalty, but the documentation of disruption.
Which preliminary works influence the schedule
Which preliminary works influence the schedule
Preliminary works may include plans, approvals, samples, access, power, water, scaffolding or completed works by other trades.
If a prerequisite is missing, the contractor cannot always simply continue. Conversely, the contractor must not assert disruption in a vague way.
The decisive point is whether the missing prerequisite is described specifically and is truly relevant for the schedule.
Why a delay notice must be specific
Why a delay notice must be specific
A mere statement that delays exist is often not enough. Cause, timing, affected works and impact are needed.
If ÖNORM B 2110 was agreed, contractual notice and documentation duties may be particularly important. Without such agreement, the contract and general works contract law apply.
Clients should check each notice for plausibility, evidence and causal link to the requested extension of time.
The schedule as evidence, not just a calendar
The schedule as evidence, not just a calendar
A schedule is more than a wish list. It shows dependencies between trades and makes visible which activity affects the critical path.
If the schedule is never updated, it is of limited help in a dispute. Changes, approvals and disruption should be entered continuously.
This later helps assess whether a delay truly follows from the alleged cause.
How clients should react to shifted dates
How clients should react to shifted dates
Request a concrete explanation of the cause, affected works and alleged additional time. Vague weekly estimates are rarely enough.
At the same time, check your own cooperation duties. If a decision or approval is missing, it should be provided quickly and documented.
For larger projects, a joint progress meeting with minutes is useful so that the parties do not later dispute the status at the time.
Schedule review
What to separate in extension of time issues
The table shows which questions should be clarified before costs and penalties.
| Point | To check | Why it matters |
|---|---|---|
| Cause Which prerequisite is missing | Causation for additional time | |
| Notice Timing and content | Evidence of timely reaction | |
| Schedule Critical path | Impact on completion |
An extension of time should never be asserted only in general terms.
Process
Document shifted dates properly
A short sequence helps with evidence and response.
- 0101
Name the disruption
- 0202
Check impact
- 0303
Secure response
Practical tip: Separate shifted dates from cost claims. Only after cause, impact and sphere of responsibility are documented can additional time be assessed legally. Book an initial consultation (72 euros)
FAQ
Extension of time and delay notice.
Is a simple email enough for a delay notice? +
An email can matter in practice. It should specify cause, timing, affected works and alleged impact.
Do I have to accept every extension of time? +
No. Check whether the cause is evidenced and whether it actually affects the schedule. General statements should be questioned.
What role does ÖNORM B 2110 play? +
It does not apply automatically, only if agreed. If agreed, notice and documentation may be particularly important.
Further reading
Related construction-law topics
Construction contract and remuneration
Überblick page on contract, performance, payment and typical construction disputes.
Construction litigation and evidence
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Construction defects and warranty
Überblick page on defects, repair, price reduction and preserving evidence.
Construction project risk analysis
Interactive risk check for clients before signing, paying or escalating.
Topics
Extension of timeDelay noticeSchedulePreliminary worksConstruction contract
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