Nthiani v Athi River Development Authority & 3 others (Environment and Land Petition 1B of 2021) [2026] KEELC 3998 (KLR)
The bottom line
#Kenya's Environment and Land Court ruled you cannot use a new constitutional petition to relitigate a dispute a court has already finally decided.
What this practically means
#Executive summary
#Questions the Court framed
#The issues the Court set itself to decide, in its own words.
- 1.Whether this Court has jurisdiction to entertain the Petition.
- 2.Whether the Petition is barred by the doctrines of res judicata and functus officio.
- 3.Whether the Petitioner has established any violation of constitutional rights warranting the reliefs sought.
- 4.What orders should issue.
Key legal issues
#Jurisdiction of the ELC to entertain a constitutional petition attacking its own judgment
The Court lacks jurisdiction; the principal grievance is directed at the Court's own judgment of 12th March 2020, and a fresh constitutional petition is not a recognised remedy.
The Court applied the settled principle that jurisdiction is everything and must be donated by the Constitution or statute. Reading the Amended Petition, the principal grievance targets the Court's own judgment in Embu ELC Case No. 148 of 2017. Persons dissatisfied with that judgment had remedies of joinder, review or appeal; a constitutional petition inviting the Court to declare its own judgment unconstitutional is not among them. Once res judicata and functus officio are established, jurisdiction to interrogate the merits falls away.
Res judicata
The Petition is barred by res judicata despite the Petitioner not being a named party, since the substance challenges findings already made.
Section 7 of the Civil Procedure Act codifies res judicata. The earlier suit conclusively determined ownership, use and occupation of the Masinga Dam Buffer Zone properties and a decree was executed. The substance of the Petition challenges those findings and seeks inconsistent orders. Relying on Supreme Court and Court of Appeal authority, the Court held that constitutional language cannot disguise a re-litigation of a concluded dispute.
Functus officio
The Court became functus officio upon delivering and perfecting its judgment; it cannot be invited to review it via a petition.
Relying on Raila Odinga (Supreme Court) and Telkom Kenya (Court of Appeal), the Court held that once a dispute is conclusively determined and the judgment perfected, the court is functus officio except where the law expressly permits revisiting. The impugned judgment remains valid, not set aside, varied or overturned on appeal. The prayer for the Court to direct itself to review its own judgment is legally untenable.
Alleged violation of Articles 20, 28, 43 and 50 and international obligations on forced evictions
No violation established; rights claims must be balanced with the right to property and finality in litigation.
Applying Anarita Karimi Njeru and Mumo Matemu, the Court held petitions must be pleaded with precision. Although the Constitution protects dignity, fair hearing and housing, and Kenya has ICESCR obligations on evictions, those rights do not authorize reopening concluded litigation. The Petitioner did not show the Respondents acted outside a lawful decree, and rights must be balanced with property rights under Article 40 and finality in litigation.
Legal principles established
#- Jurisdiction is everything; without it a court must down its tools.
- Parties cannot evade res judicata by changing the form of proceedings or introducing constitutional language where the substance of the dispute remains the same.
- Constitutional litigation is subject to res judicata where the issues raised have previously been conclusively determined.
- A court that has conclusively determined a dispute and perfected its judgment becomes functus officio except as expressly permitted by law.
- Constitutional petitions must be pleaded with reasonable precision, identifying the provisions violated, the manner of violation and the relief sought.
Court orders
#- 1.The Amended Petition dated 25th February 2024 is found to be barred by the doctrines of res judicata and functus officio.
- 2.The Court lacks jurisdiction to reopen, review or pronounce itself on the constitutional validity of its judgment delivered on 12th March 2020 in Embu ELC Case No. 148 of 2017.
- 3.The Amended Petition is dismissed.
- 4.Each party shall bear its own costs.
The bench
#One judgment of the whole court — no separate or dissenting opinions.
Wrote the judgment
- Jurisdiction invoked
- Constitution of Kenya (petition for enforcement of constitutional rights); no specific provision invoked in the judgment
Relief refused
#Declaration that the judgment of 12th March 2020 violated Articles 20 and 50 of the Constitution
Petition barred by res judicata and functus officio; the Court cannot sit on appeal over its own judgment
Order directing this Court to review the judgment of 12th March 2020
The Court is functus officio; the prayer is legally untenable
Compensation of residents of the Masinga Dam Buffer Zone after valuation
No independent constitutional violation disclosed separate from matters already adjudicated
Order compelling compliance with Article 11 of the International Covenant on Economic, Social and Cultural Rights
Constitutional rights do not authorize a court to reopen concluded litigation or ignore valid court decrees
Costs
Each party shall bear its own costs
Quotable passages
#Verbatim from the judgment, each located to the page it appears on in the official PDF — so these can be cited and checked directly.
1. The Amended Petition dated 25th February 2024 is hereby found to be barred by the doctrines of res judicata and functus officio.
2. This Court lacks jurisdiction to reopen, review or pronounce itself on the constitutional validity of its judgment delivered on 12th March 2020 in Embu ELC Case No. 148 of 2017.
3. The Amended Petition is hereby dismissed.
4. Considering the public interest dimensions raised concerning the affected residents and the constitutional issues advanced, each party shall bear its own costs.
It is now settled law that jurisdiction is everything and without it a court must down its tools.
The Court cannot sit on appeal over its own judgment nor reopen issues already conclusively determined through a constitutional petition.
Issues in the judgment
#The court file/number of the present petition is not stated anywhere in the judgment text.
Party names are not fully identified; the Petitioner's name and the 2nd and 3rd Respondents' names do not appear in the text provided, though the earlier case names Tana & Athi Rivers Development Authority.
Date discrepancy: Preliminary Objection dated 19th May 2021 yet the Amended Petition is dated 25th February 2024, suggesting sequencing not explained in the judgment.
Key timeline
#Practical implications
#Frequently asked questions
#Cite this brief
#Cite this brief
Caselaw, "Nthiani v Athi River Development Authority & 3 others (Environment and Land Petition 1B of 2021) [2026] KEELC 3998 (KLR)", Case Analysis (2026). Not stated in the judgment (relates to Embu ELC Case No. 148 of 2017). Source: https://new.kenyalaw.org/akn/ke/judgment/keelc/2026/3998/eng@2026-06-30
Suggested citation format for research notes or client memos. Always verify the original judgment before relying on any point.