Rule 42 Timeliness Is Jurisdictional in Practice: A 30‑Day Notice Requirement Bars Belated Interlocutory Appeals

1. Introduction

Suppi Construction, Inc. v. Melissa R. Sadowski is a Delaware Supreme Court interlocutory-appeal order that tightens—by strict enforcement—how and when parties may seek appellate review of non-final rulings under Delaware Supreme Court Rule 42. The underlying litigation is an employment-discrimination dispute in which Melissa R. Sadowski alleged gender discrimination and retaliation under the Delaware Discrimination in Employment Act (DDEA) against Suppi Construction, Inc. (SCI) (and also sued founder Carl Suppi).

The case’s procedural posture matters more than the merits. SCI attempted to take an interlocutory appeal from two Superior Court rulings:

  • The motion-to-dismiss decision (the “MTD Decision”) that rejected, among other arguments, SCI’s contention that Sadowski failed to exhaust administrative remedies under the DDEA and held the DDEA discrimination/retaliation claims were adequately pleaded.
  • The summary-judgment bench ruling (the “MSJ Ruling”) that found triable issues on discrimination and pretext, including by treating Carl Suppi as a potentially “appropriate comparator.”

The Supreme Court did not address the merits of the DDEA claims; the central issues were (i) timeliness of an interlocutory appeal from a years-old order and (ii) whether the MSJ Ruling met the strict standards for interlocutory review under Rule 42.

2. Summary of the Opinion

The Delaware Supreme Court refused SCI’s interlocutory appeal.

  • As to the MTD Decision, the Court held the attempted interlocutory appeal was untimely under Rule 42’s requirement that a notice of appeal be filed within 30 days of the interlocutory order. SCI’s notice—filed more than two years later—was refused.
  • As to the MSJ Ruling, the Court exercised discretion to decline interlocutory review because the request did not satisfy Rule 42’s “strict standards,” would not terminate the litigation, and lacked “exceptional circumstances”; the likely inefficiency and disruption outweighed any benefit.

3. Analysis

A. Precedents Cited

1) Sadowski v. Suppi Constr., Inc., 2023 WL 8282052 (Del. Super. Ct. Nov. 30, 2023)

This is the Superior Court’s MTD Decision. It influenced the Supreme Court’s order mainly as a procedural reference point:

  • The Superior Court found a reasonable inference of dual filing with the EEOC and DDOL because the amended complaint alleged receipt of a DDOL right-to-sue letter, supporting administrative exhaustion under the DDEA.
  • It also held the complaint sufficiently pleaded gender discrimination and retaliation under the DDEA.

The Supreme Court did not review these holdings; instead, it treated the MTD Decision as the interlocutory order SCI tried to appeal too late.

2) Sadowski v. Suppi Constr., Inc., 2026 WL 659122 (Del. Super. Ct. Mar. 9, 2026)

This is the Superior Court’s decision denying SCI’s application to certify an interlocutory appeal. Its analysis framed the Supreme Court’s refusal:

  • The Superior Court found no good cause to excuse the untimely request to certify an appeal of the MTD Decision.
  • It also concluded Rule 42(b)(iii) factors did not favor certification of the MSJ Ruling because the court was applying settled law and because interlocutory review would not end the litigation.

The Supreme Court gave “due weight” to that Rule 42 analysis and agreed interlocutory review was unwarranted.

3) McDonnell-Douglas v. Green, 411 U.S. 792, 804-05 (1973)

This is the familiar federal burden-shifting framework often used in employment discrimination cases. It appeared in SCI’s summary-judgment arguments and the Superior Court’s MSJ analysis (pretext). The Supreme Court did not apply McDonnell-Douglas directly; however, its refusal to take an interlocutory appeal effectively leaves the Superior Court’s application of that framework for potential review after final judgment.

B. Legal Reasoning

1) The MTD Decision: Rule 42’s 30-day notice requirement forecloses stale interlocutory appeals

The Supreme Court’s key procedural holding is a strict enforcement point: even if a trial court may extend the time to file an application for certification “for good cause,” Rule 42 separately requires that an appellant file in the Supreme Court a notice of appeal from an interlocutory order within thirty days after the order is entered.

Because SCI filed its notice of appeal from the MTD Decision more than two years after it was issued, the Court refused the appeal. In practical effect, the order underscores that litigants cannot “revive” an old interlocutory order for immediate appellate review long after the Rule 42(d)(i) window has closed.

2) The MSJ Ruling: no “exceptional circumstances,” no termination of litigation, and costs outweigh benefits

Interlocutory review is discretionary. The Court emphasized Rule 42’s “strict standards,” focusing on three considerations reflected in its order:

  • Non-termination: even a successful interlocutory appeal would not end the case (the litigation would continue against Suppi regardless).
  • No exceptional circumstances: the MSJ Ruling was characterized as an application of settled law to facts, not the sort of novel or statutory-construction question typically warranting immediate review.
  • Efficiency calculus: the Court concluded the potential benefits did not outweigh the “inefficiency, disruption, and probable costs” of piecemeal appellate proceedings.

C. Impact

  • Strict procedural discipline for interlocutory appeals: parties must treat the 30-day notice deadline as a hard stop. Strategically waiting until after discovery or after an adverse summary-judgment ruling will not preserve the ability to seek interlocutory review of much earlier orders.
  • Reinforcement of Rule 42’s anti-piecemeal policy: even potentially significant fact-bound rulings (like comparator analysis or pretext at summary judgment) are unlikely to qualify for interlocutory review absent a genuine novel legal issue or truly exceptional circumstances.
  • Channeling review to final judgment: the order signals that disputes over exhaustion pleading, comparator selection, and McDonnell-Douglas application are generally expected to be reviewed (if at all) on appeal from a final judgment, not midstream.

4. Complex Concepts Simplified

  • Interlocutory appeal: an appeal taken before the case ends. Delaware permits it only in narrow circumstances because it can delay and fragment litigation.
  • Certification under Supreme Court Rule 42: typically requires (i) the trial court to certify that interlocutory review is warranted and (ii) the Supreme Court to accept the appeal in its discretion, applying strict criteria.
  • Administrative exhaustion / right-to-sue letter: many employment statutes require a claimant to file with an agency (here, EEOC/DDOL) before suing; a “right-to-sue” letter signifies the administrative stage is complete enough to proceed in court.
  • Summary judgment: a pretrial ruling that ends claims only if no genuine disputes of material fact exist. A denial typically means the case must proceed to trial because a reasonable factfinder could rule for the non-moving party.
  • Comparator: in discrimination cases, a similarly situated person outside the plaintiff’s protected class used as a benchmark to infer disparate treatment. The Superior Court’s view that the absence of a “perfect” comparator does not immunize discrimination is a factual-and-legal application left for later review.
  • McDonnell-Douglas burden-shifting / pretext: a method to evaluate whether an employer’s stated reason is genuine or a cover (“pretext”) for discrimination; at summary judgment, the question is often whether a reasonable factfinder could disbelieve the employer’s reason.

5. Conclusion

This order’s significance lies in procedure, not substantive employment law. The Delaware Supreme Court refused SCI’s interlocutory appeal because (i) the attempt to appeal the MTD Decision was filed far outside Rule 42’s 30-day notice window, and (ii) the MSJ Ruling presented no exceptional circumstances warranting immediate review and would only generate the inefficiency Rule 42 is designed to prevent. The practical takeaway is clear: interlocutory review in Delaware is tightly constrained, and parties must act quickly—or wait for final judgment.