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Contract awardedMEICA

K298 Maple Lodge STW Quality AMP 7 New Permit

  • Thames Water
  • South East
  • Selective procedure
  • 1 April 2026 to 29 March 2030

Major capital works at Maple Lodge Sewage Treatment Works, including the construction of a new activated sludge plant, eight final settlement tanks, and two tertiary solids removal plants. The project involves extensive mechanical and electrical upgrades, including new chemical dosing systems, HV/LV network modifications, SCADA integration, and standby power generation, alongside significant civil alterations and the demolition of redundant site structures.

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Awarded value
£280m
As published
Published
1 April 2025
Awarded
17 February 2026
Kier Construction
Contract length
48 months
Ends 29 March 2030

What the contract covers

Single works contract

Civil engineering and mechanical construction services for large-scale water treatment plant upgrades and wastewater infrastructure improvement projects.

  • Additional inlet screen with civils alterations and screening handling upgrade
  • Additional detritor and flow inlet channel incorporating a new storm separation weir
  • New storm tank and river outfall, including flow transfer culvert and new storm return pumping station
  • Upgrades to the existing six PSTs and conversion of three storm tanks into PSTs, fitted with chain and flight scraper
  • Replacement primary chemical dosing pumps to aid phosphorus removal
  • New activated sludge plant Bank C, with new feed PS and blowers
  • Eight new 28m diameter final settlement tanks, interconnecting pipework, distribution chambers and RAS system
  • New secondary chemical dosing system to aid phosphorus removal
  • Two new tertiary solids removal treatment plants, one serving effluent from Bank A and B and one serving effluent from new Bank C
  • Additional drum thickener

Terms and requirements

Contract type
Single works contract
Procedure
Selective procedure
Initial term
48 months
Contract dates
1 April 2026 to 29 March 2030
Certifications asked for
None stated
Lots
1
Suitable for SMEs
Not stated
Category
Works
CPV codes
45252127

Services in this contract

Lifecycle

  1. Published
  2. Contract awardedto Kier Construction
  3. Contract starts
  4. Contract ends
The buyer

Thames Water

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The supplier

Kier Construction

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Cite this contract

Link
https://bidskim.com/tender/320135/k298-maple-lodge-stw-quality-amp-7-new-permit
Buyer reference
TC2239
Open contracting ID
ocds-h6vhtk-04faf2
Last checked
5 November 2026

Thames Water. K298 Maple Lodge STW Quality AMP 7 New Permit. Contract award, 1 April 2025. BidSkim, https://bidskim.com/tender/320135/k298-maple-lodge-stw-quality-amp-7-new-permit (accessed 5 November 2026).