When is a Delaware appellate answering brief due?

Serve and file the answering brief and appendix within thirty days after service of the appellant’s brief and appendix, unless another rule or Court order changes the schedule. Rule 11(c) adds three days to the prescribed participant period for mail or eFiling service.

Responsible actor. The appellee responding to the appellant’s opening brief.

Obtain the served opening brief and appendix.

Identify the effective service event and method.

Read the docket for a changed briefing schedule or granted extension.

Establish effective service of both required papers and select personal service, mail or eFiling. Use the ordinary thirty-day schedule only without a different rule or order.

1. Effective service of the appellant’s opening brief and appendix
2. Exclude the established event day and count the stated component under Rule 11(a). Select personal, mail or eFiling service; add Rule 11(c) days to the prescribed participant period before counting.
3. Personal service uses the stated period. Mail and eFiling add three days before final-day treatment.
4. Serve and file the answering brief and appendix. Preserve the incoming service evidence, outgoing service proof and filing receipt. Deliver required paper copies of an eFiled brief by the next business day.

Rule 11(a) excludes the event day. A prescribed period below seven days excludes intermediate Saturdays, Sundays and legal holidays. Seven days and longer count those intermediate days. A final Saturday, Sunday, legal holiday or actual Clerk closure receives the stated next-open-day treatment. A backward five-day motion component counts earlier eligible days to preserve its required lead. Do not apply the separate Chancery or Superior Court eleven-day threshold.

The 2026 named calendar follows the Court’s published statewide holidays. The 2027 dates are projections of 1 Del. C. § 501 and its fixed-holiday observation rule. December 31, 2027 is the observed New Year holiday for Saturday, January 1, 2028. These dates do not confirm future amendments, Governor or Chief Justice appointments or actual additional closures. Sussex Return Day afternoon is not treated as a statewide full-day Supreme Court closure. Review any actual additional closure separately.

Rule 11(c) adds three days to a participant’s prescribed period after incoming service by mail or eFiling. Personal service adds none. The addition enters the period before Rule 11(a) counting and final-day treatment. It does not apply to Court acts or to an entry, filing, issuance or acceptance event merely because a copy is served. Rule 10(b) completes mail service on mailing. Rule 10.1(h) treats authorized electronic service like mail for the addition. A convenience email notification under Rule 10.2(6)(d) is not the service event.

Reviewed coverage uses the retained Supreme Court compilation current through February 2, 2026, for established events on or after that compilation boundary and final dates through December 31, 2027. The index label is not a new effective date for every civil rule. Historical events, backward periods crossing that boundary, later dates, changed orders and actual additional closures require separate review. No computed or paid date is supplied for an input outside that coverage. This boundary does not establish that an actual act is late.

Fictitious example

Fictitious effective personal service, no changed order or actual additional closure. Establish effective service of both required papers and select personal service, mail or eFiling. Use the ordinary thirty-day schedule only without a different rule or order.

Fictitious established facts. The example does not establish applicability, actual service, completed filing, an extension, entitlement or a special closure. Establish effective service of both required papers and select personal service, mail or eFiling. Use the ordinary thirty-day schedule only without a different rule or order.

Method changes the period

Personal service uses the prescribed thirty days. Mail or eFiling uses thirty-three days before Rule 11(a) final-day treatment.

Notifications are not service

Rule 10.2(6) distinguishes effective File & Serve service from convenience email notifications. Preserve the service receipt and selected recipients.

Cross-appeal content

An appellee who is also a cross-appellant must identify the combined answering and cross-opening brief as Rule 14 requires.

Participant service and Court acts

Rule 11(c) adds three days to a participant’s prescribed period after incoming service by mail or eFiling. Personal service adds none. The addition enters the period before Rule 11(a) counting and final-day treatment. It does not apply to Court acts or to an entry, filing, issuance or acceptance event merely because a copy is served. Rule 10(b) completes mail service on mailing. Rule 10.1(h) treats authorized electronic service like mail for the addition. A convenience email notification under Rule 10.2(6)(d) is not the service event.

Compilation and calendar coverage

Reviewed coverage uses the retained Supreme Court compilation current through February 2, 2026, for established events on or after that compilation boundary and final dates through December 31, 2027. The index label is not a new effective date for every civil rule. Historical events, backward periods crossing that boundary, later dates, changed orders and actual additional closures require separate review. No computed or paid date is supplied for an input outside that coverage. This boundary does not establish that an actual act is late.

• Establish effective service of both required papers and select personal service, mail or eFiling. Use the ordinary thirty-day schedule only without a different rule or order.
• The stated component does not obtain an extension, establish completed acts or decide an excluded procedural branch.

• Obtain the served opening brief and appendix.
• Identify the effective service event and method.
• Read the docket for a changed briefing schedule or granted extension.
• Personal service uses the prescribed thirty days. Mail or eFiling uses thirty-three days before Rule 11(a) final-day treatment.
• Rule 10.2(6) distinguishes effective File & Serve service from convenience email notifications. Preserve the service receipt and selected recipients.
• An appellee who is also a cross-appellant must identify the combined answering and cross-opening brief as Rule 14 requires.
• For the paper participants described in Rule 10, serve the required recipients and complete filing by actual Clerk or Deputy Clerk receipt during regular business hours. Mailing a filing on the final day does not establish receipt. Registered eFiling under Rules 10.1 and 10.2 uses the recorded completed transaction. In nonexpedited cases, ordinary electronic filings must finish by 5 p.m. Eastern Time. Notices of appeal and electronic filings in expedited cases must finish before midnight Eastern Time. Electronic service requires selection of recipients and submission through File & Serve. Preserve the receipt identifying date, time, method and recipients. The email notification alone is not service. Rule 10.2(10) permits relief for specified filing or service errors only upon satisfactory proof and a Court order; no automatic extension is calculated. Rule 10.2(3) requires the paper copies of an eFiled brief by the next business day. Their cover must say COPY and include the electronic document ID. Check Rule 10(d), any specific copy provision and the actual Court direction. These copies do not replace timely electronic filing or required party service.