Provision of Septic Tank Design, Construction Services, and Other Associated Infrastructure Works at the United Nations Office at Nairobi, Kenya

The United Nations Office at Nairobi (UNON) seeks to engage a qualified and experienced civil engineering contracting firm(s) to design and construct an upgraded septic tank(s) and waste water reticulation system at the UNON Complex. The objective is to establish a reliable, compliant, and scalable wastewater treatment solution that: • Meets current operational wastewater treatment needs • Complies with Kenyan environmental and public health regulations • Aligns with international wastewater management standards (WHO guidelines) • Provides capacity for future expansion to accommodate increased demand • Ensures minimal disruption to ongoing UN operations during implementation Stage 1: Immediate Upgrade (Mandatory): Tol be executed to address the current wastewater treatment infrastructure. The works shall be implemented over four (4) distinct phases Phase 1: Planning and Design Phase 2: Construction Phase 3: Decommissioning Phase 4: Post-Construction Stage 2: Future Expansion (Optional) Design shall accommodate potential additional capacity for approximately 3,000 persons during peak periods Specific Requirements/Information Interested vendors must possess the necessary technical expertise and capacity to provide the required services, as only suitably qualified vendors will be invited to participate in the Request for Proposal that will be issued following the finalization of this REOI exercise. A vendor's suitability shall be assessed using the Preliminary Assessment checklist attached as Annex A to this REOI. Vendors must submit their EOI electronically online, through UNGM. In addition, vendors who have registered their interest in UNGM must also complete Annex A and return it via e-mail to unon-procurement-rfx@un.org, with copy to james.boardman@un.org and jackson.kimani1@un.org, by the REOI closing date of 15 January 2026. Please refer to Annex A for detailed instructions and assessment procedure. Vendors expressing interest must be registered with UNGM, at minimum at the Basic Level. Vendors not registered in UNGM will not be eligible to participate in the Request for Proposal at a later stage. Details of the technical evaluation criteria and other particular requirements will be provided under the Request for Proposal at a later stage. Please note that this request for EOI is not an invitation for submission of proposal/offer. Vendors currently registered at basic level in the United Nations Global Marketplace (UNGM) are encouraged to proceed and submit requirements for level 1 registration.