Hong Kong · civil procedure

What period applies to arbitration serious irregularity?

Within 30 days after award delivery. Make application and serve originating summons or summons. Both making and service are required; the source does not make every award challenge eligible.

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Period: Within 30 days after award delivery
Trigger: Actual delivery of the award
Rule: Rules of the High Court (Cap. 4A), Order 73, rule 5(1); Arbitration Ordinance (Cap. 609), Schedule 2, section 4

Rules of the High Court (Cap. 4A), Order 73, rule 5(1); Arbitration Ordinance (Cap. 609), Schedule 2, section 4

Official verified English consolidated chapter 4A, version October 1,2025. Acquired October 9, 2026, with the official current register and immutable verified PDF. Current verified official English consolidated chapter PDFs acquired October 9, 2026. Version dates retained per chapter register. No claim that a calendar proves future gale, black-rainstorm or emergency office closures.

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Establish the actual Hong Kong procedure

Party entitled to the Schedule 2 serious-irregularity challenge. Make application and serve originating summons or summons.

Use the main date field for Actual delivery of the award. Within 30 days after award delivery.

Establish the actual High Court or statutory branch. Summer omission applies only where its precise source supports it.

The compiled public holiday calendar covers 2026 and 2027. Actual gale, black-rainstorm and other Court-office closures remain separate facts.

Actual award delivery date

This calculation assumes:

The actual actor, operative event, complete relevant history and completion route are established.
No different operative Court order, permitted agreement or statutory period changes this ordinary branch.
Schedule 2 section 4 actually applies
Award delivery established
Serious-irregularity route
Required grounds and evidence
For this ordinary branch no August-crossing short-period interval requiring unresolved section 31 analysis
The actual arbitration agreement makes Schedule2 applicable.
The award was not corrected or interpreted.
This ordinary interval does not cross the High Court Summer Vacation.

Was the Court office closed on any day in this period? (optional)

Actual gale or black-rainstorm dates

Actual other Court-office closure dates

Schedule 2 applicability depends on the qualifying agreement or statutory transitional route, not all Hong Kong arbitrations.

Actual delivery of the award

Party entitled to the Schedule 2 serious-irregularity challenge. Schedule 2 section 4 actually applies; Award delivery established; Serious-irregularity route; Required grounds and evidence; For this ordinary branch no August-crossing short-period interval requiring unresolved section 31 analysis. Schedule 2 applicability depends on the qualifying agreement or statutory transitional route, not all Hong Kong arbitrations.

Entry rules and timing exceptions

30 days from Delivery of the award

Rules of the High Court (Cap. 4A), Order 73, rule 5(1); Arbitration Ordinance (Cap. 609), Schedule 2, section 4Binding

Rule notes

Both the making of the application and service must occur within the 30 days. Schedule 2 of Cap. 609 applies only where the parties have opted in or where it applies automatically to certain domestic agreements.

Calculation software, not legal advice. Check the current rule, orders and facts.

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What period applies to arbitration serious irregularity?

Within 30 days after award delivery. Make application and serve originating summons or summons. Both making and service are required; the source does not make every award challenge eligible.

Responsible actor. Party entitled to the Schedule 2 serious-irregularity challenge.

Actual delivery of the award

Within 30 days after award delivery

Rules of the High Court (Cap. 4A), Order 73, rule 5(1); Arbitration Ordinance (Cap. 609), Schedule 2, section 4

How does this provision count time?

Make application and serve originating summons or summons
Party entitled to the Schedule 2 serious-irregularity challenge uses the established actual delivery of the award. Within 30 days after award delivery. Exclude the effective event day. Ordinary intervening weekends remain counted unless an applicable source provision excludes them.
Make application and serve originating summons or summons. An applicable Court-office completion may move under the exact final-day source only when the act cannot be done there. Establish the actual office route, closure and any different effective electronic route. Both making and service are required; the source does not make every award challenge eligible.
Both making and service are required; the source does not make every award challenge eligible.

Party entitled to the Schedule 2 serious-irregularity challenge uses the established actual delivery of the award. Within 30 days after award delivery. Exclude the effective event day. Ordinary intervening weekends remain counted unless an applicable source provision excludes them.

Make application and serve originating summons or summons. An applicable Court-office completion may move under the exact final-day source only when the act cannot be done there. Establish the actual office route, closure and any different effective electronic route. Both making and service are required; the source does not make every award challenge eligible.

Rules of the High Court (Cap. 4A), Order 73, rule 5(1); Arbitration Ordinance (Cap. 609), Schedule 2, section 4

What do independently checked examples show?

Fictitious example

Party entitled to the Schedule 2 serious-irregularity challenge. Actual delivery of the award occurs on Friday, October 9, 2026. The retained eligibility and ordinary procedural conditions apply. Schedule2Applies By Actual Agreement true. Actual Award Delivered Friday, October 9, 2026. Correction Or Interpretation false. No Summer Crossing true.

Example counting steps
Step	What is counted	Date
Example 1. Ordinary established facts	Party entitled to the Schedule 2 serious-irregularity challenge. Actual delivery of the award occurs on Friday, October 9, 2026. The retained eligibility and ordinary procedural conditions apply. Schedule2Applies By Actual Agreement true. Actual Award Delivered Friday, October 9, 2026. Correction Or Interpretation false. No Summer Crossing true. Within 30 days after award delivery. Both making and service are required; the source does not make every award challenge eligible.	Monday, November 9, 2026
Example 2. Closed-day boundary	Party entitled to the Schedule 2 serious-irregularity challenge. Actual delivery of the award occurs on Saturday, September 19, 2026. The retained eligibility and ordinary procedural conditions apply. Schedule2Applies By Actual Agreement true. Actual Award Delivered Saturday, September 19, 2026. Correction Or Interpretation false. No Summer Crossing true. Within 30 days after award delivery. Both making and service are required; the source does not make every award challenge eligible.	Tuesday, October 20, 2026
Example 3. Material procedural branch	Party entitled to the Schedule 2 serious-irregularity challenge. Actual delivery of the award occurs on Friday, October 9, 2026. The complete eligibility and procedural facts are not established. Schedule2Applies By Actual Agreement not established. Actual Award Delivered not established. Correction Or Interpretation not established. No Summer Crossing not established. This actual branch must be established independently before any ordinary endpoint can be used. Schedule 2 section 4 actually applies	Schedule 2 applicability depends on the qualifying agreement or statutory transitional route, not all Hong Kong arbitrations.

Example resultMonday, November 9, 2026

Fictitious established facts. These examples do not establish eligibility, effective service, relief or a direction.

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Which conditions and exceptions apply?

Schedule 2 section 4 actually applies: Schedule 2 section 4 actually applies
Award delivery established: Award delivery established
Serious-irregularity route: Serious-irregularity route
Required grounds and evidence: Required grounds and evidence
For this ordinary branch no August-crossing short-period interval requiring unresolved section 31 analysis: For this ordinary branch no August-crossing short-period interval requiring unresolved section 31 analysis
Correct source counting and completion route: Party entitled to the Schedule 2 serious-irregularity challenge uses the established actual delivery of the award. Within 30 days after award delivery. Exclude the effective event day. Ordinary intervening weekends remain counted unless an applicable source provision excludes them. Make application and serve originating summons or summons. An applicable Court-office completion may move under the exact final-day source only when the act cannot be done there. Establish the actual office route, closure and any different effective electronic route. Both making and service are required; the source does not make every award challenge eligible.

Rules of the High Court (Cap. 4A), Order 73, rule 5(1); Arbitration Ordinance (Cap. 609), Schedule 2, section 4

Party entitled to the Schedule 2 serious-irregularity challenge. Schedule 2 section 4 actually applies; Award delivery established; Serious-irregularity route; Required grounds and evidence; For this ordinary branch no August-crossing short-period interval requiring unresolved section 31 analysis. Schedule 2 applicability depends on the qualifying agreement or statutory transitional route, not all Hong Kong arbitrations.
Schedule 2 applicability depends on the qualifying agreement or statutory transitional route, not all Hong Kong arbitrations.

What must the responsible actor complete?

Schedule 2 section 4 actually applies
Award delivery established
Serious-irregularity route
Required grounds and evidence
For this ordinary branch no August-crossing short-period interval requiring unresolved section 31 analysis
Actual delivery of the award
Make application and serve originating summons or summons
Schedule 2 applicability depends on the qualifying agreement or statutory transitional route, not all Hong Kong arbitrations. Both making and service are required; the source does not make every award challenge eligible. A Court extension, abridgment or permitted written agreement under the applicable Order3 rule5 must be retained. It does not silently replace the source event.

Questions about this procedure

What period applies to arbitration serious irregularity?

Does every arbitration permit a serious-irregularity challenge?

No. Establish that Schedule 2 section 4 applies through the actual agreement or applicable statutory route.

Rules of the High Court (Cap. 4A), Order 73, rule 5(1); Arbitration Ordinance (Cap. 609), Schedule 2, section 4

What starts the thirty days?

Order 73 rule 5(1) uses delivery of the award.

Rules of the High Court (Cap. 4A), Order 73, rule 5(1); Arbitration Ordinance (Cap. 609), Schedule 2, section 4

Is making the application alone enough?

No. The originating summons or summons must also be served within thirty days.

Rules of the High Court (Cap. 4A), Order 73, rule 5(1); Arbitration Ordinance (Cap. 609), Schedule 2, section 4

Must the summons state the challenge grounds?

Rule 5(4)(a) requires the grounds to be stated.

Rules of the High Court (Cap. 4A), Order 73, rule 5(1); Arbitration Ordinance (Cap. 609), Schedule 2, section 4

When are relied-on affidavits served?

Rule 5(4)(b)(i) requires copies of every intended affidavit with the summons where the application is founded on affidavit evidence.

Rules of the High Court (Cap. 4A), Order 73, rule 5(1); Arbitration Ordinance (Cap. 609), Schedule 2, section 4

Does the twenty-eight-day appeal rule control this challenge?

No. This is the specific Arbitration Ordinance Schedule 2 and Order 73 procedure.

Rules of the High Court (Cap. 4A), Order 73, rule 5(1); Arbitration Ordinance (Cap. 609), Schedule 2, section 4

Official sources and review

Provisions used (6)

Provisions used in this guide
Provision	Purpose
Rules of the High Court (Cap. 4A), Order 73, rule 5(1); Arbitration Ordinance (Cap. 609), Schedule 2, section 4	Check the identified procedure, event, counting rule or qualification
Rules of the High Court (Cap.4A), Order3 rules1–5 and Order64 rule1	Check the identified procedure, event, counting rule or qualification
High Court Ordinance (Cap.4), section31(1), including its endorsed-writ proviso	Check the identified procedure, event, counting rule or qualification
Interpretation and General Clauses Ordinance (Cap.1), section71(1)–(2)	Check the identified procedure, event, counting rule or qualification
General Holidays Ordinance (Cap.149), section3 and Schedule	Check the identified procedure, event, counting rule or qualification
Arbitration Ordinance (Cap.609), section81 and Schedule2 paragraphs4–6 as applicable	Check the identified procedure, event, counting rule or qualification

Read the official controlling provision

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What lawyers say

1What period applies to arbitration serious irregularity?

2How does this provision count time?

3What do independently checked examples show?

4Which conditions and exceptions apply?

5What must the responsible actor complete?

6Questions about this procedure

What period applies to arbitration serious irregularity?

Does every arbitration permit a serious-irregularity challenge?

What starts the thirty days?

Is making the application alone enough?

Must the summons state the challenge grounds?

When are relied-on affidavits served?

Does the twenty-eight-day appeal rule control this challenge?

7Official sources and review

What period applies to arbitration serious irregularity?

How does this provision count time?

What do independently checked examples show?

Which conditions and exceptions apply?

What must the responsible actor complete?

Questions about this procedure

Official sources and review