What is the deadline for part 36 relevant period?
A Part 36 offer must usually specify a relevant period of at least 21 days. Enter the service date to calculate the end of the minimum period.
CPR 36.5(1)(c)Reviewed
Calculate your deadline
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Worked example
- Example input
- 03/08/2026
- Expected result
- Monday 24 August 2026
The Part 36 offer was served on Monday 3 August 2026.
The service day is excluded and the 21-day relevant period runs to Monday 24 August. The page does not infer a different period stated in the offer.
How this deadline is counted
- Period
- At least 21 days
- Trigger
- Service of the Part 36 offer
- Direction
- Forward from service
- Counting method
- 21 clear days; the service day is excluded
All calendar days count because the period exceeds five days. A deadline ending on a court closure day moves under CPR 2.8(5).
Civil Procedure Rules Part 36. CPR 36.5(1)(c). Civil Procedure Rules source checked 06/08/2026
Exceptions and matter facts
- An offer made less than 21 days before trial is subject to CPR 36.5(2).
- The offer itself may specify a longer period, which controls instead of the minimum.
Deadline Engine is calculation software, not legal advice. Check the current rule, any order and the facts before adding a date to your diary.