WP6235 -T5D MEP Subcontractor

Costain Limited (H7-Heathrow)

Published: Jun 2, 2026

Updated: Jun 4, 2026

Source: uk_contracts_finder

About This Opportunity

This is a services contract in the architecture and engineering sector. Located in United Kingdom, Europe, this opportunity is open to firms and consortiums, with an estimated budget of GBP 5.0 million. Proposals must be submitted before June 9, 2026.

Published through UK Contracts Finder, a national government procurement portal. Public procurement tenders follow the country's national bidding regulations and may have specific eligibility and documentation requirements for services in the architecture and engineering sector. Service contracts are typically evaluated on both technical quality and price, and may require bidders to demonstrate relevant experience and qualified personnel. Interested parties should review the full documentation on the original source before submitting their proposal.

Description

Expression of Interest T5D MEP Subcontractor T5D Attenuator Overhaul (Survey / RIBA 4iii) Scope The T5D Rail-tunnel Ventilation Shaft is located adjacent to T5D at its North and can be accessed from the bottom (Level 6) via the trackside of the HEX tunnel or from the top (level 7) via Airside. The objective is to replace the four attenuators in the T5D Shaft because they are at their end of life. The renewal of the T5D attenuators aims to reduce the risk of debris entering fans, tunnels and station, prevent the fans from failing in any fire scenario and provide ventilation and smoke clearance for the Heathrow Rail Tunnels. This improves safety conditions in Heathrow Rail Tunnels and improves resilience of systems. In addition, less maintenance and repair are required for the attenuator. Each attenuator is formed of four quadrants weighing around 1160 kg. Review MEP systems along the airflow and advise replacement/modification to bring them up to compliance. Surveys will be carried out by MEP Subcontractor under the direction of the Design Consultant (Employed by the Client). Item Question Q1 What capability do you have of understanding the requirements for replacing attenuators etc., considering the constraints of an operational rail network? Q2 What capability do you have of carrying out a survey of the T5D Shaft during non-operational hours to provide all the information required to complete the RIBA 4ii design by the Design Consultant and the RIBA 4iii by the MEP Subcontractor? • M&E Services within the air path • Fan and Attenuator • Structure Note: - RIBA 5 onwards including construction is excluded.. CPV: Engineering design services (71320000). Suitable for SMEs. Suitable for VCSEs

Data provenance

This notice is sourced from UK Contracts Finder and was originally published on June 2, 2026. Last refreshed today. Reference: C4N113536520. BidsFactory mirrors official procurement notices and links back to the source for full legal text.

About Costain Limited (H7-Heathrow)

Costain Limited (H7-Heathrow) has issued 23 procurement notices on BidsFactory, including 3 currently open and 0 awarded contracts. Activity concentrates in Construction & Civil Works, Architecture & Engineering Services, and Water & Sanitation. All notices are published for United Kingdom. Notices are distributed via UK Contracts Finder. Most recent publication: June 2, 2026.

Frequently asked questions about this tender

What type of contract is this?

This is a Services contract in the Architecture & Engineering Services sector. The classification helps bidders match the opportunity to their qualifications and registered scope of supply.

What is the estimated budget?

The estimated contract value is £5,000,000 - £5,000,000. Bidders should ensure their proposals are consistent with this range and account for any local taxes and contract execution costs.

Where will the contract be performed?

The contract is for delivery in United Kingdom. Foreign bidders should review local registration, taxation, and any in-country presence requirements before submitting.

How can I submit a bid?

Visit UK Contracts Finder to access the full notice, required documents, and submission instructions. Quote reference C4N113536520 when communicating with the contracting authority.

When does this tender close?

The submission deadline is June 9, 2026. You have 5 days left to prepare and submit your proposal to the contracting authority.

Who is the contracting authority?

This notice was issued by Costain Limited (H7-Heathrow) in United Kingdom. The authority is responsible for evaluating bids, awarding the contract, and managing performance.