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Section 10-11.Impleading of Third Party by Defendant in Civil Action

Current through August 12, 2025 (2026 Practice Book edition) · Last verified July 9, 2026

In one sentenceThis section lets a defendant, with court permission, bring in a non-party as a third-party defendant who may be liable for all or part of the plaintiff's claim, and it sets out the resulting rights and claims among plaintiff, defendant, and third-party defendant.

Full Text of Section 10-11

Text sizeJump to: (a) (b) (c) (d) (e)

(a) A defendant in any civil action may move the court for permission as a third-party plaintiff to serve a writ, summons and complaint upon a person not a party to the action who is or may be liable to such defendant for all or part of the plaintiff’s claim against him or her. Such a motion may be filed at any time before trial and such permission may be granted by the judicial authority if, in its discretion, it deems that the granting of the motion will not unduly delay the trial of the action or work an injustice upon the plaintiff or the party sought to be impleaded. The writ, summons and complaint so served shall be equivalent in all respects to an original writ, summons and complaint, and the person upon whom it is served, hereinafter called the third-party defendant, shall have available to him or her all remedies available to an original defendant, including the right to assert setoffs or counterclaims against the thirdparty plaintiff, and shall be entitled to file cross complaints against any other third-party defendant. The third-party defendant may also assert against the plaintiff any defenses which the thirdparty plaintiff has to the plaintiff’s claim and may assert any claim against the plaintiff arising out of the transaction or occurrence which is the subject matter of the plaintiff’s claim against the thirdparty plaintiff.
(b) The plaintiff, within twenty days after the third-party defendant appears in the action, may assert any claim against the third-party defendant arising out of the transaction or occurrence which is the subject matter of the original complaint, and the third-party defendant, as against such claim, shall have available to him or her all remedies available to an original defendant, including the right to assert setoffs or counterclaims against the plaintiff.
(c) A third-party defendant may proceed under this section against any person not a party to the action who is or may be liable to such defendant for all or any part of the third-party plaintiff’s claim against him or her.
(d) When a counterclaim is asserted against a plaintiff, the plaintiff may cause a third party to be brought in under circumstances which under this section would entitle a defendant to do so.
(e) When any civil action in which such a third party has been brought in is reached for trial, the judicial authority hearing the case may order separate trials of different parts of the action and may make such other order respecting the trial of the action as will do justice to the parties and expedite final disposition of the case.

Amendment History

(P.B. 1978-1997, Sec. 117.)

Plain-English Summary

Section 10-11 governs third-party practice, commonly called impleader. A defendant may move the court for permission to serve a writ, summons, and complaint on a person not already in the case who is or may be liable to that defendant for all or part of the plaintiff’s claim. The motion may be filed any time before trial, and the judicial authority grants it at its discretion if doing so will not unduly delay trial or work an injustice on the plaintiff or the person to be impleaded. Once served, the third-party defendant is treated like an original defendant: they can assert setoffs or counterclaims against the third-party plaintiff, file cross complaints against other third-party defendants, raise against the plaintiff any defenses the third-party plaintiff has, and assert their own claim against the plaintiff arising from the same transaction or occurrence.

The plaintiff, within twenty days after the third-party defendant appears, may assert a claim against that third-party defendant arising from the same transaction or occurrence as the original complaint, and the third-party defendant can defend against it with the same remedies available to an original defendant. A third-party defendant may in turn implead a further non-party under the same standard. When a counterclaim is asserted against a plaintiff, the plaintiff may bring in a third party under the same circumstances that would let a defendant do so. Finally, when a case with an impleaded third party reaches trial, the judicial authority may order separate trials of different parts of the action and make other orders to do justice and expedite the case.

Frequently Asked Questions

What is a third-party defendant in Connecticut practice?

A third-party defendant is a person not originally a party whom a defendant, acting as a third-party plaintiff, brings into the case because that person is or may be liable for all or part of the plaintiff's claim.

Does a defendant need court permission to implead a third party?

Yes. The defendant must move the court for permission, and the judicial authority decides whether granting it will unduly delay trial or work an injustice on the plaintiff or the party sought to be impleaded.

Can the plaintiff sue the third-party defendant directly?

Yes, within twenty days after the third-party defendant appears, the plaintiff may assert a claim against that third-party defendant arising out of the same transaction or occurrence as the original complaint.

Can a third-party defendant implead someone else?

Yes, a third-party defendant may proceed under this section against any other person who is or may be liable for all or part of the third-party plaintiff's claim.

Source & verification. The section text is reproduced verbatim from the official Connecticut Practice Book (Conn. Practice Book § 10-11). Prescribed by the Judges of the Superior Court of Connecticut (Conn. Gen. Stat. Section 51-14). The plain-English summary is original and written by us. Last verified July 9, 2026. · Official source
Also known as: third party complaint Connecticutimpleader rule CThow to bring in third party defendantthird party plaintiff practicecite in third party liable for claim