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K298 Maple Lodge STW Quality AMP 7 New Permit

Awarded to KIER INFRASTRUCTURE AND OVERSEAS LIMITED

THAMES WATER UTILITIES LIMITED(buyer)

Published
Published 1 April 2025
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Overview

Thames Water Utilities Limited awarded Kier Infrastructure and Overseas Limited a contract on 17 February 2026 for major wastewater treatment works at Maple Lodge Sewage Treatment Works, with a current value of approximately £140–280 million. The scope includes inlet screening and handling upgrades, new storm tanks and outfalls, primary and secondary treatment plant expansions (including a new activated sludge plant Bank C with eight final settlement tanks), tertiary solids removal, chemical dosing systems for phosphorus removal, electrical and SCADA upgrades, and demolition of redundant structures as part of Thames Water's Asset Management Plan 7.

Contracting authority

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Key details

Country
United Kingdom
Status
In delivery
Category
Works
Procedure
Selective
Published
1 April 2025
Questions by
25 April 2025
Classification (CPV)
Wastewater treatment plant construction work

Award outcome

Award date
17 February 2026
Contract period
19 October 2025 → 29 March 2030
Winner
  • KIER INFRASTRUCTURE AND OVERSEAS LIMITED

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Notice history

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  1. Contract

    17 February 2026

  2. Contract Notice

    1 April 2025

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