Published date: 4 February 2019

Closed opportunity - This means that the contract is currently closed. The buying department may be considering suppliers that have already applied, or no suitable offers were made.

Closing: 7 March 2019

Contract summary


  • Sewer mains - 44130000

  • Sewage chambers - 44131000

  • Sewer pipes - 44163130

    • Construction work - 45000000

    • Site preparation work - 45100000

    • Excavating and earthmoving work - 45112000

    • Earthmoving work - 45112500

    • Siteworks - 45113000

    • Works for complete or part construction and civil engineering work - 45200000

    • Engineering works and construction works - 45220000

    • General construction work for pipelines - 45231100

    • Construction work for water and sewage pipelines - 45231300

    • Ancillary works for pipelines and cables - 45232000

    • Sewer construction work - 45232400

    • Construction work for sewage pipes - 45232440

    • Architectural, construction, engineering and inspection services - 71000000

    • Engineering services - 71300000

    • Engineering design services - 71320000

    • Engineering design services for the construction of civil engineering works - 71322000

Location of contract


Value of contract


Procurement reference


Published date

4 February 2019

Closing date

7 March 2019

Contract start date

23 September 2019

Contract end date

23 October 2019

Contract type


Procedure type

Restricted procedure (above threshold)

A two-stage procedure, where the first stage is used to select suppliers, who are then invited to bid in the second stage.

This procedure can be used for procurements above the relevant contract value threshold.

Contract is suitable for SMEs?


Contract is suitable for VCSEs?



North London Waste Authority (the authority) is seeking a Contractor for the design, supply, construction and commissioning of sewer diversion works on the existing Angel and Chingford sewers. The sewer diversion works are part of the North London Heat and Power Project (NLHPP) for the development of a new energy recovery facility and associated works at the Edmonton EcoPark pursuant to a development consent order granted to the authority on 24.2.2017. A new Resource Recovery Facility (RRF) will be constructed over the existing Angel and Chingford sewers and their confluence manhole. Following Thames Water requirements on the accessibility and endurance of their asset, the prior diversion of approximately 165 m of the Angel sewer and 115 m of the Chingford sewer including the construction of new manhole access points is required to maintain access and allow the RRF to be constructed over the Thames Water asset. The sewer diversion works are on the critical path for the NLHPP. The sewer diversion works include:

(i) tunnelling works for the installation of a 1 200 mm diameter sewer along a stretch of approximately 115 m diverting the Chingford sewer, and the installation of a 1 200 mm diameter sewer along a stretch of approximately 165 m diverting the Angel sewer;

(ii) installation of a drive shaft at the confluence of the 2 sewers of approximately 9,0 m deep;

(iii) installation of reception shafts at the 2 sewers of approximately 9,0 m deep and

(iv) connection of the new sewers to the existing sewers. Further details of the required works are set out in the Memorandum of Information, forming part of the procurement documents. The works must comply with the Thames Water standards regarding their assets. The site for sewer diversion works, Edmonton EcoPark, is an operational waste management site where LondonEnergy Ltd, a private company wholly owned by the authority, operates an existing Energy from Waste (EfW) facility. Normal operation of the EfW facility is to be maintained at all times during the construction.

More information


Additional text

Candidates can sign up for an account on our e-procurement portal ( (Portal) and express an interest. Procurement documents are available on the Portal.

Is a Recurrent Procurement Type? : No

About the buyer

Contact name

NLHPP Project Officer


25 Ashley Road
Tottenham Hale
United Kingdom