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KBS Maritime launches £3.5m–£5m Penstock Replacement Programme at Portsmouth Naval Base


KBS Maritime has issued a major live tender for the replacement of penstocks at B Lock within Portsmouth Naval Base, with an estimated contract value of £3.5m–£5m.


The works form a critical marine infrastructure upgrade, replacing ageing cast iron penstock systems controlling seawater flow between the harbour, basin and dry dock facilities.


The contract is being procured under a restricted procedure and is suitable for experienced SME contractors with proven marine infrastructure capability.


🏗️ Scope of works includes:


  • replacement of 10 penstocks across 6 chambers

  • works at depths ranging from approx. 8m to 18m

  • replacement of existing cast iron door systems

  • installation of new shafts, wedges, door nuts and brackets

  • platforms, ladders and access systems

  • actuation systems and associated road plates

  • full marine environment installation works


⚓ Delivery requirements


Contractors must be able to demonstrate:

  • proven penstock replacement experience in marine environments

  • design, manufacture and installation capability

  • full CDM compliance and site management systems

  • strong health & safety performance record

  • minimum 5 years’ relevant marine sector experience


The programme is scheduled to commence in Q4 2026, with completion expected by February 2030.


🏗️ ConstructNet Intelligence Overview

This represents a high-value, long-term marine civils opportunity within one of the UK’s most sensitive infrastructure environments.


Likely opportunity areas include:


  • marine civil engineering contractors

  • steel fabrication and heavy mechanical systems specialists

  • hydraulic and water control system installers

  • diving and underwater engineering support services

  • temporary works and access system providers

  • specialist CDM and marine HSE consultants


The extended programme duration indicates sustained subcontract demand across multiple phases of delivery within Portsmouth Naval Base.


📌 How to Apply

All expressions of interest must be submitted via the KBS Maritime procurement portal:



Suppliers must register and follow the instructions to access tender documentation and submit responses.


⚠️ ConstructNet Disclaimer

This ConstructNet intelligence brief is based on publicly available procurement information and ConstructNet analysis. It is provided for business development and market awareness purposes only and does not constitute professional, financial, procurement, or legal advice. Users should independently verify all tender details, requirements and submission instructions before taking action.


 
 
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