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    ContractsPenstock Replacement Contract at Portsmouth Naval Base
    Closed contract

    Penstock Replacement Contract at Portsmouth Naval Base

    Contract value
    £3.5m
    Closed 18 Jun 2026

    KBS Maritime is seeking qualified contractors to design, manufacture, and install 10 replacement penstocks at B Lock in Portsmouth Naval Base between December 2026 and February 2030.

    🇬🇧United KingdomPublished 27 May 2026· 2 months agoviaContracts Finder
    Contract value
    £3.5m
    Closed 18 Jun 2026
    Tender deadline passed on 18 Jun 2026.

    Decision brief

    4 fields
    • Contract value
      est.£3,500,000
      Pounds sterling
    • Tender closed
      18 Jun 2026
      2 months ago
    • Sector
      Manufacturing
      Browse related listings
    • Location
      🇬🇧United Kingdom

    Lifecycle

    Closed

    Tender closed on 18 Jun 2026. Awaiting award.

    27 May 2026Today18 Jun 2026

    Brief

    KBS Maritime is seeking experienced contractors for the replacement of 10 penstocks across 6 chambers at B Lock, HM Naval Base Portsmouth. This marine infrastructure project involves replacing cast iron penstock doors with new units, including associated components such as shafts, wedges, brackets, platforms, ladders, and actuation systems. The levelling penstocks are approximately 8 metres deep, while drainage penstocks reach approximately 18 metres deep. The penstock system controls seawater flow between the harbour, basin, and dry docks. Project timeline: commencement December 2026, completion February 2030. Contractors must demonstrate: (1) design, manufacture, and installation expertise in marine environments; (2) full site management capabilities under CDM regulations; (3) health and safety competency and safe practices; (4) minimum five years' experience in marine environments. All contractors and sub-contractors require BPSS security vetting and Portsmouth Naval Base security clearance. Required insurance: £10 million Public Liability, £10 million Product Liability, and £5 million Professional Indemnity. Key dates: Expressions of Interest close 18 June 2026; bidders selected by end of June 2026; Invitation to Tender published early July 2026; ITT closes early September 2026.

    Track record

    1 award · 1 winner
    Thin record

    Only 1 prior award here — too little to read.

    In manufacturing, MINISTRY OF DEFENCE has awarded 1 contract to 1 supplier.

    Who wins here
    1. WASHCO LTD1× · 100%

    Across manufacturing, the most active winners are Lord Combustion Services Limited, Morris Vermaport Ltd, JACKSON LIFT SERVICES LIMITED — the field to beat, or your route in as a partner.

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    Take action
    View on sourceContracts Finder

    Original closed notice on the publisher's site

    Publisher
    UK Cabinet Office
    Licence
    OGL v3.0
    Source
    contractsfinder.service.gov.uk
    Record ID
    194a8516-37fa-4d45-8bc5-bf2a03252d40-899277
    MD
    Buyer
    MINISTRY OF DEFENCE
    Sector
    Manufacturing