Who may serve a summons and complaint in Delaware?

Only the sheriff or a deputy sheriff of the county where service is to be made, or a person the Superior Court specially appoints for that purpose, under Superior Court Civil Rule 4(d). Delaware does not allow ordinary private process serving of the summons and complaint.

Can a party serve their own summons in Delaware?

No. Rule 4(d) limits service of the summons and complaint to the sheriff, a deputy, or a specially appointed server. A party to the case cannot serve it themselves.

Does the 18-and-older, non-party server rule apply to a Delaware summons?

No. That threshold appears in Rule 45(b)(1) for subpoenas only. Rule 4 itself sets no minimum age for a specially appointed process server, and it still requires court appointment, not just an adult non-party.

How does someone become a specially appointed process server in Delaware?

By motion under Rule 4(d)(1), showing the sheriff already returned the writ non est inventus, or that service must occur after 10:00 p.m. on a weekday, on a weekend or holiday, or for another exigent reason. The sheriff gets notice of the motion and may object.

Does Delaware have an official proof of service form?

Superior Court has no mandatory statewide numbered proof-of-service form for civil actions. The proof is the server's return, made on or with the writ and docketed under Rule 4(g). If a court supplies its own return template, that form controls.

Does a Delaware return of service need to be notarized?

It depends on who serves. An officer's return needs no verification. A specially appointed server's return must be verified under Rule 4(g), but the rule text does not say whether that means a notarized affidavit or an unsworn declaration, so confirm with the issuing court.

Is mailing enough to serve a Delaware summons?

Not on an in-state defendant. Rule 4(f) authorizes personal delivery, leaving copies at the defendant's dwelling with a person of suitable age and discretion, or delivery to an agent authorized by appointment or by law, not mail-only service. Mail appears in Rule 4 for out-of-state defendants served through the Secretary of State, and as certified mail plus posting for scire facias and similar lien notices, a supplement to sheriff service.

How long do I have to serve a summons in Delaware?

120 days after the complaint is filed. If service is not made within that time and the plaintiff cannot show good cause, the action shall be dismissed as to that defendant without prejudice, after notice (Rule 4(j)).

When must the return of service be filed in a Delaware case?

There is no separate day count for filing the return. Rule 4(g) ties it to the writ's own return day, set 20 days after the writ issues, and requires the person who served it to make return promptly and, in any event, by that return day.

How do I serve later papers like motions in a Delaware case?

Under Rule 5, later papers go to the attorney of record if the party is represented, or to the unrepresented party, by hand, by leaving a copy at the office, at the residence if the office is closed or there is no office, or by mail, which is complete upon mailing. Unlike the summons, a party appears permitted to serve these papers. Proof under Rule 5(f) is a receipt endorsed by the parties served, an affidavit of service, or a certificate of an attorney of record.

What happens if service of a Delaware summons is defective?

Rule 4(g) says a failure to make a return or proof of service does not itself affect the validity of service. Still, follow Rule 4's service and return requirements exactly, and never sign a return that misstates how or when service occurred, since it is a court filing and a non-officer's return must be verified.

Does this Delaware proof of service cover federal court, service abroad, or a government defendant?

No. Service on the federal government, a foreign country, or under the Hague Service Convention, and service in federal court under the Federal Rules of Civil Procedure, follow separate rules not covered on this page.

Delaware Proof of Service

Delaware bars ordinary private process serving outright: only the sheriff, a deputy, or a person the Court specially appoints may serve a summons and complaint, and mail alone never completes service on an in-state defendant.

Find out where you stand in Delaware

Where are you with service?

DocDraft provides document preparation, not legal advice.

Introduction

Delaware Superior Court Civil Rule 4(d) bars ordinary private process serving: only the sheriff or a deputy of the county, or a person the Court specially appoints, may serve a summons and complaint. A special appointment needs a motion showing the sheriff already returned the writ non est inventus, or an exigent reason such as after-hours, weekend, or holiday service, with notice to the sheriff. A party cannot serve their own summons. Delaware's 18-and-older, non-party rule covers only subpoenas under Rule 45(b)(1); Rule 4 sets no minimum server age. Superior Court has no mandatory statewide proof-of-service form; the proof is the server's return, docketed with the writ under Rule 4(g). An officer's return needs no verification; a specially appointed server's return must be verified, though the rule does not say whether that means a notarized affidavit or an unsworn declaration. Rule 4(f) authorizes personal delivery, leaving copies at the defendant's dwelling with a suitable person, or delivery to an authorized agent, not mail-only service on an in-state defendant. Service must happen within 120 days after filing, absent good cause. The return is due promptly, by the writ's return day, 20 days after issuance. Later papers go to the attorney of record or the unrepresented party by hand, at the office, at the residence if the office is closed or there is none, or by mail, complete upon mailing; unlike the summons, a party appears permitted to serve those and prove it by affidavit. Federal, foreign, and government service are not covered here. Attorney review is available.

Key Things to Know

1
Only the sheriff or a deputy sheriff of the county where service is to be made, or a person the Court specially appoints, may serve a Delaware summons and complaint (Rule 4(d)). Since September 1, 2025, the plaintiff, not the Prothonotary, delivers the service documents to the sheriff after the writ issues. Superior Court has no mandatory statewide numbered proof-of-service form; the return is made on or with the writ itself and docketed under Rule 4(g), and the unnumbered Sample Praecipe used to direct the sheriff whom to serve is a different document, not the proof.
2
A party to the case cannot serve their own summons and complaint; Rule 4(d) allows only the sheriff, a deputy, or a specially appointed server. Delaware's commonly cited 18-and-older, non-party server rule exists only for subpoenas under Rule 45(b)(1). It does not apply to the summons and complaint, where Rule 4 itself states no minimum age for a specially appointed server.
3
A special appointment under Rule 4(d)(1) requires a motion showing one of four grounds: the sheriff already made one return of non est inventus (not found); service must occur after 10:00 p.m. on a weekday; service must occur on a weekend or holiday; or another exigent reason exists. The sheriff must receive notice of the motion and may object to the appointment.
4
An officer's (sheriff's or deputy's) return needs no verification under Rule 4(g). A specially appointed server's return must be verified. The rule text does not itself say whether that verification must be a notarized affidavit or may instead be an unsworn declaration under penalty of perjury, so confirm the requirement with the issuing court before filing.
5
Rule 4(f) authorizes personal delivery to the defendant, leaving copies at the defendant's dwelling house or usual place of abode with a person of suitable age and discretion then residing there, or delivering copies to an agent authorized by appointment or by law to receive service of process. It does not authorize mail-only service of the summons and complaint on an in-state defendant. Mail appears in Rule 4 for out-of-state defendants served through the Secretary of State, which is outside this page's scope, and as certified mail plus posting for scire facias and similar lien notices under Rule 4(f)(4)-(5), a supplement to sheriff service, not a substitute.
6
Service of the summons and complaint must be made within 120 days after the complaint is filed. If service is not made in that time and the plaintiff cannot show good cause, the action shall be dismissed as to that defendant without prejudice, after notice (Rule 4(j)).
7
Delaware sets no separate day count to file the return after service. Instead, Rule 4(g) ties the return to the writ itself: the writ is returnable 20 days after it issues, and the person who served it must make return promptly and, in any event, by that return day. Later papers are proved under Rule 5(f) by a receipt endorsed by the parties served, an affidavit of service, or a certificate of an attorney of record. Unlike the summons, a party to the case appears permitted to serve those papers and prove it by affidavit.

Key decisions before you file

Before you file a Proof of Service in Delaware, a few decisions shape the document: which option to choose and what each one means. The Proof of Service guide walks through them.

Open the Proof of Service guide

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IN THE SUPERIOR COURT OF THE STATE OF DELAWARE IN AND FOR [COUNTY] COUNTY

[PLAINTIFF NAME], Plaintiff,

v. C.A. No. [CASE NUMBER]

[DEFENDANT NAME], Defendant.

RETURN OF SERVICE

Superior Court has no mandatory statewide numbered proof-of-service form for this action. This return states the information Superior Court Civil Rule 4(g) and 10 Del. C. section 3103(b) require. If this Court supplies or requires its own return template, that form controls instead of this one. Service of the summons and complaint may be made only by the sheriff, a deputy sheriff, or a person this Court specially appoints under Rule 4(d).

OFFICER RETURN (complete only if served by the sheriff or a deputy)

I, [NAME OF SHERIFF OR DEPUTY SHERIFF], Sheriff or Deputy Sheriff of [COUNTY] County, Delaware, received the service documents the plaintiff delivered on [DATE DOCUMENTS DELIVERED]. I served a copy of the summons, complaint, and affidavit, if any, on [NAME OF PERSON SERVED] by [METHOD OF SERVICE: PERSONAL DELIVERY TO THE DEFENDANT; LEAVING COPIES AT THE DEFENDANT'S DWELLING HOUSE OR USUAL PLACE OF ABODE WITH A PERSON OF SUITABLE AGE AND DISCRETION THEN RESIDING THEREIN; OR DELIVERING COPIES TO AN AGENT AUTHORIZED BY APPOINTMENT OR BY LAW TO RECEIVE SERVICE OF PROCESS] on [DATE OF SERVICE] at [TIME OF SERVICE], at [ADDRESS OR PLACE OF SERVICE]. This return needs no verification under Rule 4(g), because it is made by an officer.

SPECIALLY APPOINTED SERVER RETURN (complete only if served by a specially appointed server)

I, [NAME OF SPECIALLY APPOINTED SERVER], was specially appointed by Order of this Court dated [DATE OF APPOINTMENT ORDER], on a showing that [THE SHERIFF RETURNED THE WRIT NON EST INVENTUS ON A STATED DATE, SERVICE WAS REQUIRED AFTER 10:00 P.M. ON A WEEKDAY, SERVICE WAS REQUIRED ON A WEEKEND OR HOLIDAY, OR ANOTHER EXIGENT REASON EXISTED], with notice to the Sheriff of [COUNTY] County as Rule 4(d)(1) requires. I served a copy of the summons, complaint, and affidavit, if any, on [NAME OF PERSON SERVED] by [METHOD OF SERVICE: PERSONAL DELIVERY TO THE DEFENDANT; LEAVING COPIES AT THE DEFENDANT'S DWELLING HOUSE OR USUAL PLACE OF ABODE WITH A PERSON OF SUITABLE AGE AND DISCRETION THEN RESIDING THEREIN; OR DELIVERING COPIES TO AN AGENT AUTHORIZED BY APPOINTMENT OR BY LAW TO RECEIVE SERVICE OF PROCESS] on [DATE OF SERVICE] at [TIME OF SERVICE], at [ADDRESS OR PLACE OF SERVICE]. This return is verified as Rule 4(g) requires of a non-officer's return.

Sworn to and subscribed before me on [DATE] by [NAME OF SERVER]. [SIGNATURE OF NOTARY PUBLIC] My commission expires: [DATE]

IF SERVICE WAS NOT COMPLETED

The reasons service could not be had were [REASONS SERVICE COULD NOT BE MADE], as Rule 4(g) requires.

[SIGNATURE OF SERVER] [PRINTED NAME OF SERVER] [ADDRESS OF SERVER] [CITY, STATE, ZIP] Official capacity, if any: [OFFICIAL CAPACITY]

PROOF OF SERVICE OF LATER PAPERS (Rule 5(f))

An attorney of record may sign this as a certificate of service. Any other person who served the papers signs it as an affidavit before a notary.

On [DATE], I served a copy of [NAME OF DOCUMENT] on [NAME OF PARTY OR ATTORNEY OF RECORD] by [METHOD OF SERVICE: DELIVERING IT TO THE ATTORNEY OR PARTY; LEAVING IT AT THE OFFICE WITH A CLERK OR PERSON IN CHARGE; LEAVING IT IN A CONSPICUOUS PLACE IN THE OFFICE BECAUSE NO ONE WAS IN CHARGE; LEAVING IT AT THE DWELLING HOUSE OR USUAL PLACE OF ABODE WITH A PERSON OF SUITABLE AGE AND DISCRETION RESIDING THERE, BECAUSE THE OFFICE WAS CLOSED OR THERE WAS NO OFFICE; OR MAILING IT TO THE LAST KNOWN ADDRESS], at [ADDRESS]. Service by mail is complete upon mailing, as Rule 5(b) provides.

[SIGNATURE] [PRINTED NAME]

If signed as an affidavit: Sworn to and subscribed before me on [DATE] by [NAME OF PERSON WHO SERVED]. [SIGNATURE OF NOTARY PUBLIC] My commission expires: [DATE]

Delaware Requirements for Proof of Service

No General Private Process Serving
Only the sheriff or a deputy sheriff of the county where service is to be made, or a person the Court specially appoints, may serve a Delaware summons and complaint (Rule 4(d)).
Party Barred From Serving the Summons
A party to the case cannot serve their own summons and complaint. Rule 4(d) limits service to the sheriff, a deputy, or a specially appointed server.
Subpoena Age Rule Does Not Cover the Summons
The 18-and-older, non-party server rule in Rule 45(b)(1) applies only to subpoenas. Rule 4 sets no minimum age for a specially appointed process server, and still requires a court appointment first.
Special Appointment Requires a Motion and Grounds
Rule 4(d)(1) allows a special appointment only on a motion showing the sheriff already returned the writ non est inventus, or that service must occur after 10:00 p.m. on a weekday, on a weekend or holiday, or for another exigent reason, with notice to the sheriff.
No Statewide Numbered Proof of Service Form
Superior Court has no mandatory statewide numbered proof-of-service form. The proof is the server's return, made on or with the writ and docketed under Rule 4(g); the unnumbered Sample Praecipe directs the sheriff whom to serve and is a different document.
Verification Required Only for Non-Officer Returns
An officer's return needs no verification under Rule 4(g). A specially appointed server's return must be verified, though the rule text does not specify a notarized affidavit versus an unsworn declaration.
No Mail-Only Service on In-State Defendants
Rule 4(f) authorizes personal delivery, leaving copies at the defendant's dwelling with a person of suitable age and discretion, or delivery to an authorized agent, not mail-only service of the summons and complaint on an in-state defendant.
120-Day Time to Serve With Good-Cause Exception
Service of the summons and complaint must be made within 120 days after the complaint is filed; otherwise, unless the plaintiff shows good cause, the action shall be dismissed as to that defendant without prejudice, after notice (Rule 4(j)).
Return Tied to the Writ's 20-Day Return Day
Rule 4(g) sets no separate filing deadline for the return; instead, the writ is returnable 20 days after it issues, and the server must make return promptly and by that return day.

Find out where you stand in Delaware

Introduction

Key Things to Know

Key decisions before you file

Customize your Proof of Service Template with DocDraft

Delaware Requirements for Proof of Service

No General Private Process Serving

Party Barred From Serving the Summons

Subpoena Age Rule Does Not Cover the Summons

Special Appointment Requires a Motion and Grounds

No Statewide Numbered Proof of Service Form

Verification Required Only for Non-Officer Returns

No Mail-Only Service on In-State Defendants

120-Day Time to Serve With Good-Cause Exception

Return Tied to the Writ's 20-Day Return Day

Frequently Asked Questions