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Joining a Pennsylvania additional defendant: 60 days, and no third-party practice

Pennsylvania procedure · Last verified August 17, 2026

Pennsylvania does not have third-party practice in the federal sense. It has additional defendants, and the difference is not just terminology: the Pennsylvania device is broader than its federal cousin, and it closes far sooner.

The number to remember is 60 days.

Who can be joined, and why it is broader

Pa.R.Civ.P. 2252(a):

Except as provided by Rule 1706.1, any party may join as an additional defendant any person not a party to the action who may be (1) solely liable on the underlying cause of action against the joining party, or (2) liable to or with the joining party on any cause of action arising out of the transaction or occurrence or series of transactions or occurrences upon which the underlying cause of action against the joining party is based.

Subsection (1) is the part that has no federal equivalent. Federal Rule 14 lets a defendant bring in someone who is liable to the defendant for the plaintiff's claim — an indemnity or contribution theory. Pennsylvania lets a defendant bring in someone who is solely liable to the plaintiff.

That is a genuinely different tool. A Pennsylvania defendant who believes the plaintiff sued the wrong person does not have to argue about it in the abstract; it can join the right one and let the jury sort it out.

Note also "any party" — this is not limited to defendants.

The 60 days

Pa.R.Civ.P. 2253(a):

Except as provided by Rule 1041.1(e), neither praecipe for a writ to join an additional defendant nor a complaint if the joinder is commenced by a complaint, shall be filed later than (1) sixty days after the service upon the original defendant of the initial pleading of the plaintiff or any amendment thereof, or (2) the time for filing the joining party's answer as established by Rule 1026, Rule 1028 or order of court, whichever is later, unless such filing is allowed by order of the court or by the written consent of all parties approved by and filed with the court.

Three points, and each one matters.

The clock starts on service of the plaintiff's initial pleading, not on your answer, not on discovery, not on when you worked out who else was at fault. Sixty days from being served.

But take whichever is later. If preliminary objections have pushed your answer date past the 60 days, the answer date governs. In an ordinary case where you simply answer, the 60 days is the operative figure.

And late joinder needs permission — from the court or from everyone. Written consent of all parties works, but it must be approved by and filed with the court. A private agreement among counsel is not enough.

Where leave is granted, the rule sets its own follow-on deadline:

The praecipe for a writ to join an additional defendant or the complaint joining the additional defendant shall be filed within twenty days after notice of the court order or the court approval of the written consent or within such other time as the court shall fix.

Two ways to start, and a trap in one of them

Rule 2252(b):

The joining party may file as of course a praecipe for a writ or a complaint. (1) If the joinder is by writ, the joining party shall file a complaint within twenty days from the filing of the praecipe for the writ. If the joining party fails to file the complaint within the required time, any other party may seek a rule to file the complaint and an eventual judgment of non pros in the manner provided by Rule 1037(a) for failure to file a complaint.

So the writ route buys you a place in the queue but starts a second, shorter clock. Praecipe today means complaint within twenty days — and the sanction for missing it is a judgment of non pros against your joinder.

If you already know what you would plead, the complaint route avoids the second deadline entirely.

What happens after joinder

Rule 2255(a) puts the joining party in the plaintiff's shoes:

The procedure, including pleadings, between the party joining an additional defendant and the additional defendant shall be the same as though the party joining the additional defendant were a plaintiff and the additional defendant were a defendant.

Rule 2255(c) then does something unusual:

No judgment on the pleadings may be entered in favor of any party against an additional defendant for failure to answer the complaint of the party joining the additional defendant, but all allegations of fact in such complaint to which an answer is required and which are not sufficiently answered shall be conclusive upon the additional defendant.

Read that carefully if you are the additional defendant. You cannot lose on the pleadings for silence — but silence makes the factual allegations conclusive against you. That is a worse outcome than it first sounds, and it is close to losing without the label.

Rule 2255(d) completes the picture:

The plaintiff shall recover from an additional defendant found liable to the plaintiff alone or jointly with the defendant as though such additional defendant had been joined as a defendant and duly served and the initial pleading of the plaintiff had averred such liability.

So the plaintiff gets the benefit of a joinder it never sought. An additional defendant brought in by a co-defendant can end up paying the plaintiff directly.

How Pennsylvania compares

PennsylvaniaNew JerseyNew YorkFederal
Name of the deviceadditional defendantthird-party complaintthird-party complaintthird-party complaint
May join someone solely liable to the plaintiffyesnonono
Who may joinany partydefendantdefendantdefending party
Deadline60 days from service of the plaintiff's initial pleading, or the answer date, whichever is later90 days after service of the original answer14 days after serving the answer, else by leave
Late joindercourt order, or all-party written consent filed with the courtleaveleaveleave
May start with a writyes, then complaint in 20 daysnonono
Judgment on the pleadings for silenceno — but the facts become conclusiveavailable

A short checklist

  1. Calendar 60 days from service of the plaintiff's initial pleading, the day you are served — not from when you finish investigating.
  2. Check whether your answer date is later. If preliminary objections moved it, that date governs instead.
  3. Consider whether the person is solely liable to the plaintiff. Pennsylvania lets you join them; federal practice would not.
  4. Prefer the complaint to the writ unless you need the extra time — the writ starts a 20-day clock with a non pros at the end of it.
  5. If you are past 60 days, get an order or all-party written consent, and make sure the consent is approved by and filed with the court.
  6. After leave is granted, file within 20 days.
  7. If you are the additional defendant, answer. You cannot suffer judgment on the pleadings for silence, but unanswered factual allegations become conclusive against you.
  8. Remember the plaintiff can recover from you directly, even though the plaintiff never sued you.

Where these rules live

This page explains what the rules say. It isn't legal advice, and the standard for allowing late joinder is developed in case law this site doesn't cover.

How this guide is sourced. Every procedural statement here is drawn from the text of the rules named above, each of which is reproduced verbatim on its own page on this site. Quoted rule language appears in quotation marks or block quotes; everything else is original writing. Last verified August 17, 2026.
This page explains what the rules say. It is legal information, not legal advice, and it cannot tell you how a rule applies to your situation. Deadlines are often short and some are not extendable — if the outcome matters, talk to a lawyer or your court’s self-help center.