Tender

Supply Chain Notice: WAT0149-01 B Lock Penstock Replacements- Portsmouth Naval Base

MINISTRY OF DEFENCE

This public procurement record has 1 release in its history.

Tender

27 May 2026 at 08:02

Tender Notice
Summary of the contracting process

This procurement process, initiated by the Ministry of Defence, focuses on the project titled "Supply Chain Notice: WAT0149-01 B Lock Penstock Replacements- Portsmouth Naval Base". This tender falls under the industry category of penstock valves and is located at the Portsmouth Naval Base in the South East region of the United Kingdom. Currently at the tender stage, key dates include the closing of expressions of interest on 18th June 2026, with the project expected to commence in December 2026 and complete by February 2030. The procurement method utilised is a restricted procedure, specifying a selective approach for engaging suppliers, with an estimated contract value of £3,500,000. The tender is specifically aimed at SME suitability, providing opportunities for smaller enterprises to engage in substantial infrastructural projects within a secure military environment.

This tender represents a significant business growth opportunity for companies experienced in marine environment projects, particularly those capable of demonstrating proficiency in the design, manufacture, and installation of penstock replacements. With the project demanding adherence to complex logistical and security requirements, businesses with at least five years of relevant marine experience will be well-positioned to compete. Companies specialising in infrastructure and possessing robust health and safety compliance are encouraged to express interest. The partnership between KBR and BAE Systems through KBS Maritime highlights the potential for collaboration with major industry players, offering a prestigious project for businesses aiming to enhance their portfolio in public defence infrastructure contracts.

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Notice Information

Notice Title

Supply Chain Notice: WAT0149-01 B Lock Penstock Replacements- Portsmouth Naval Base

Notice Description

The Tenderer should be aware that the works detailed in this package are constrained due to the nature of the location they are to be conducted in. Project location- HM Naval Base Portsmouth The Contractor shall be expected to adhere by the HMNB site security requirements, all Contractors and Sub-Contractors shall be BPSS security vetted and will be required to hold the relevant site security passes. The Contractor shall be expected to hold the following levels of insurance PS10m Public Liability, PS10m Product Liability, PS5m Professional Indemnity. KBS Maritime - Introduction KBS Maritime is a joint venture between KBR and BAE Systems, bringing together two global players with a rich heritage of delivering excellence, innovation and reliability. The joint venture will combine the expertise of KBR as a global leader in infrastructure asset management and services with BAE Systems' experience and capability within Portsmouth Naval Base. KBS Maritime are delivering an ambitious, modern and enduring change to the Portsmouth Naval base infrastructure, securing investment in the local community and ensuring fit-for-purpose, world-leading fleet support for the Royal Navy and the UK in the decades ahead. Project Background KBS Maritime has a requirement for penstock replacements at B Lock within Portsmouth Naval Base. The project consists of 10 in number replacement penstocks in 6 chambers overall. The penstock system controls sea water via a culvert system between the harbour, the basin and the dry docks. These include levelling penstocks of circa 8 metres deep to drainage penstocks circa 18 metres deep. The replacement programme will replace the current cast irons doors with new with specification to be agreed along with the associated shafts, wedges, door nut, brackets, platforms, ladders and actuation and road plates. This project is due to commence in Q4 2026 with all to be replaced by Feb 2030. Contractors must be able to demonstrate design, manufacture and installation of penstock replacements in a marine environment including all site management under CDM regulations and competency of Health and Safety compliance and safe practices. Contractors must also possess at least five years' experience working within a marine environment. Contractors who do not provide suitable and sufficient evidence of this will not be considered. Key Dates (approximate) - Expressions of Interest close: 18/06/2026 - Bidders Selected: by end of June 2026 - ITT Published: early July 2026 - ITT Close: early September 2026 - Project commencement: December 2026 - Project Completion Feb 2030

Notice Details

Publication & Lifecycle

Open Contracting ID
ocds-b5fd17-112178fc-2c4a-44be-8b03-ec22c183718c
Publication Source
Contracts Finder
Latest Notice
https://www.contractsfinder.service.gov.uk/Notice/194a8516-37fa-4d45-8bc5-bf2a03252d40
Current Stage
Tender
All Stages
Tender

Procurement Classification

Notice Type
Tender Notice
Procurement Type
Standard
Procurement Category
Works
Procurement Method
Selective
Procurement Method Details
Restricted procedure (above threshold)
Tender Suitability
SME
Awardee Scale
Not specified

Common Procurement Vocabulary (CPV)

CPV Divisions

42 - Industrial machinery

CPV Codes

42131220 - Penstock valves

Notice Value(s)

Tender Value
£3,500,000 £1M-£10M
Lots Value
Not specified
Awards Value
Not specified
Contracts Value
Not specified

Notice Dates

Publication Date
27 May 20261 weeks ago
Submission Deadline
18 Jun 20262 weeks to go
Future Notice Date
Not specified
Award Date
Not specified
Contract Period
1 Dec 2026 - 28 Feb 2030 3-4 years
Recurrence
Not specified

Notice Status

Tender Status
Active
Lots Status
Not Specified
Awards Status
Not Specified
Contracts Status
Not Specified

Buyer & Supplier

Contracting Authority (Buyer)

Main Buyer
MINISTRY OF DEFENCE
Contact Name
Available with D3 Tenders Premium →
Contact Email
Available with D3 Tenders Premium →
Contact Phone
Available with D3 Tenders Premium →

Buyer Location

Locality
PORTSMOUTH
Postcode
PO1 3NH
Post Town
Portsmouth
Country
England
Major Region (ITL 1)
TLJ South East (England)
Basic Region (ITL 2)
TLJ3 Hampshire and Isle of Wight
Small Region (ITL 3)
TLJ31 Portsmouth
Delivery Location
TLJ South East (England)
Local Authority
Portsmouth
Electoral Ward
Charles Dickens
Westminster Constituency
Portsmouth South

Further Information

Notice Documents

Open Contracting Data Standard (OCDS)

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The Open Contracting Data Standard (OCDS) is a framework designed to increase transparency and access to public procurement data in the public sector. It is widely used by governments and organisations worldwide to report on procurement processes and contracts. 

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