Maina (Suing on Behalf of the Estate of Peter Maina Waigwa (Deceased)) & 8 others v Nairobi City County Government (Environment and Land Case E521 of 2025) [2026] KEELC 5129 (KLR)
The bottom line
#Kenya's Environment and Land Court allowed a negligence claim against Nairobi County to proceed, ruling res judicata didn't bar it because the cause of action differed from earlier ownership disputes.
What this practically means
#Executive summary
#Key legal issues
#Whether the suit is barred by res judicata under Section 7 of the Civil Procedure Act
The preliminary objection fails because, although the parties and the suit property are similar to the prior proceedings, the cause of action in negligence was neither raised nor determined in those proceedings.
The court restated the four elements of res judicata from the Supreme Court's decision in John Florence Maritime Services: a final judgment on the merits by a competent court, with identical parties, subject matter and cause of action. ELC No. E439 of 2021 determined ownership of L.R No. 209/4844/124 and ordered eviction; ELC No. 114 of 2009 concerned a different plot. The present claim, however, is founded on the tort of negligence - the alleged failure of the Defendant to defend the Plaintiffs' interests - which was not in issue in either prior suit. Identity of cause of action being absent, res judicata is not proven.
The proper nature of a preliminary objection
A preliminary objection must rest on a pure point of law and cannot be blurred with contested factual details.
Relying on Mukisa Biscuits Manufacturing Co Ltd v West End Distributors Ltd and Oraro v Mbaja, the court reaffirmed that a preliminary objection is in the nature of a demurrer, argued on the assumption that the facts pleaded by the other side are correct. An assertion that requires ascertainment of facts or exercise of judicial discretion is not a true preliminary objection. The court applied these principles before reaching the res judicata question on the pleadings and prior judgments.
Legal principles established
#- Res judicata requires identity of cause of action between the former and subsequent suits; where a later suit is founded on a different cause of action (tort of negligence) from the earlier ownership dispute, the plea fails even if the parties and subject property are the same.
- A preliminary objection must be a pure point of law, not dependent on facts requiring proof or the exercise of judicial discretion.
Court orders
#- 1.The preliminary objection dated 18th November 2025 is dismissed with costs
- Jurisdiction invoked
- Original jurisdiction of the Environment and Land Court; application under Order 40 Rules 1, 2, 3 & 4 and Order 51 Rule 1 of the Civil Procedure Rules, Sections 1A, 1B, 2, 3A and 63(c) of the Civil Procedure Act
Key timeline
#Practical implications
#Frequently asked questions
#Cite this brief
#Cite this brief
Caselaw, "Maina (Suing on Behalf of the Estate of Peter Maina Waigwa (Deceased)) & 8 others v Nairobi City County Government (Environment and Land Case E521 of 2025) [2026] KEELC 5129 (KLR)", Case Analysis (2026). ELC LC E521 OF 2025. Source: https://new.kenyalaw.org/akn/ke/judgment/keelc/2026/5129/eng@2026-07-31
Suggested citation format for research notes or client memos. Always verify the original judgment before relying on any point.