--- title: "WP1150 - Survey & Design - Tunnel Vent Vans & Fan Drives" ocid: "ocds-b5fd17-25f831be-e278-45de-ba56-42465ff8de0f" canonical_url: "https://d3tenders.com/contract/?ocid=ocds-b5fd17-25f831be-e278-45de-ba56-42465ff8de0f" markdown_url: "https://d3tenders.com/contract/ocds-b5fd17-25f831be-e278-45de-ba56-42465ff8de0f.md" json_url: "https://d3tenders.com/contract/ocds-b5fd17-25f831be-e278-45de-ba56-42465ff8de0f.json" source: "Contracts Finder" current_stage: "Tender" buyer: "COSTAIN LIMITED (H7-HEATHROW)" published: "2026-06-02" --- # WP1150 - Survey & Design - Tunnel Vent Vans & Fan Drives Buyer: COSTAIN LIMITED (H7-HEATHROW) Current stage: Tender OCID: ocds-b5fd17-25f831be-e278-45de-ba56-42465ff8de0f [View canonical contract page](https://d3tenders.com/contract/?ocid=ocds-b5fd17-25f831be-e278-45de-ba56-42465ff8de0f) [Download OCDS JSON](https://d3tenders.com/contract/ocds-b5fd17-25f831be-e278-45de-ba56-42465ff8de0f.json) ## Summary Costain Limited (H7-Heathrow) is the buying organisation for the "WP1150 - Survey & Design - Tunnel Vent Vans & Fan Drives" tender, which falls under the engineering design services category. The procurement process is at the Tender stage, with the tender period ending on 9th June 2026. It focuses on replacing components of the ventilation system at various locations including the Central Terminal Area and Terminal 4 in London, UK. The procurement method details were not specified. The contract is valued at between £2.5 million and £5 million, with the work anticipated to start on 7th August 2026 and conclude by 1st December 2026. The procurement is particularly suitable for SMEs and VCSEs interested in services related to low voltage electrical components and ventilation systems. This tender presents significant business opportunities, especially for firms specialising in electrical infrastructure and ventilation systems design and implementation. Businesses with RIBA stage 4 design expertise, particularly under the operational constraints of rail networks, will find this an excellent growth opportunity. With the tender encompassing survey and design elements, companies experienced in replacing Variable Speed Drives and associated electrical components will be well-suited to bid. The project also calls for energy-efficient lighting upgrades, providing an additional avenue for businesses specialising in eco-friendly electrical solutions. ## Notice Expression of Interest Tunnel Vent, Fans and Fan Drives MEP Subcontractor Tunnel Vent, Fans and Fan Drives (Survey and RIBA 4) Scope The objective of this scope is to replace components that form part of the ventilation system at Central Terminal Area (CTA) North and South, Terminal 4 North and South and Sipson Farm, that are at their end of life. The components of concern are Fan Drives and Low Voltage Air Circuit Breakers. It is proposed that all components for the 8 No. existing Variable Speed Drives (VSD) which are close to their designed lifetime are to be replaced, together with the panel. It is proposed that all components for the 5 No. existing Direct On-Line (DOL) starters which are close to their designed lifetime are to be replaced, together with the panel are replaced with VSD's. The VSDs are to be connected to the Tunnel Control System (TCS). The incoming air circuit breakers (ACB's) and the low voltage protection devices (MCCB/MCB's) within the existing switch gear will be replaced with new devices. Where the impact is significant, this may lead to replacing the entire LV switchgear and the DOL panels for the associated equipment. New lighting will be provided by energy-efficient LED luminaires, as the existing lighting system is in poor condition. As part of small power provision, 240V socket outlet assemblies shall be provided near damper units. The existing junction boxes and cable termination boxes need to be replaced with new equipment. Item Question Q1 What capability do you have of understanding the requirements for replacing Electrical infrastructure etc., Specifically considering the constraints of an operational rail network? Q2 What capability do you have of carrying out a survey of the 5 ventilation buildings non-operational hours to provide all the information required to complete the RIBA 4 design? Note: - RIBA 5 onwards including construction is excluded. ## Key Details | Field | Value | | --- | --- | | Publication source | Contracts Finder | | Latest notice | https://www.contractsfinder.service.gov.uk/Notice/30b4b20a-4bc7-4af3-a070-34305c20e5bb | | Notice type | Tender Notice | | Procurement type | Standard | | Procurement category | Services | | Procurement method | Not Specified | | Procurement method details | Not specified | | Tender suitability | SME, VCSE | | Awardee scale | Not specified | | All stages | Tender | ## Dates | Field | Value | | --- | --- | | Publication date | 2 Jun 2026 | | Submission deadline | 9 Jun 2026 | | Future notice date | Not specified | | Award date | Not specified | | Contract period | 6 Aug 2026 - 1 Dec 2026 | | Recurrence | Not specified | ## Values | Field | Value | | --- | --- | | Tender value | £5,000,000 | | Lots value | Not specified | | Awards value | Not specified | | Contracts value | Not specified | ## Status | Field | Value | | --- | --- | | Tender status | Active | | Lots status | Not specified | | Awards status | Not specified | | Contracts status | Not specified | ## Buyer | Field | Value | | --- | --- | | Main buyer | COSTAIN LIMITED (H7-HEATHROW) | | Locality | MAIDENHEAD | | Post town | Slough | | Postcode | SL6 4UB | | Country | England | | ITL 1 | TLJ South East (England) | | ITL 2 | TLJ1 Berkshire, Buckinghamshire and Oxfordshire | | ITL 3 | TLJ15 Berkshire East | | Local authority | Windsor and Maidenhead | | Electoral ward | Oldfield | | Westminster constituency | Maidenhead | | Delivery location | TLI London | ## CPV Codes ### Divisions - 71 - Architectural, construction, engineering and inspection services ### Codes - 71320000 - Engineering design services ## Release History - 2 Jun 2026 at 09:20 - Tender - Tender Notice - https://www.contractsfinder.service.gov.uk/Notice/30b4b20a-4bc7-4af3-a070-34305c20e5bb ## Documents - https://www.contractsfinder.service.gov.uk/Notice/30b4b20a-4bc7-4af3-a070-34305c20e5bb 2nd June 2026 - Opportunity notice on Contracts Finder - https://www.competefor.com/business/viewOpportunityDetailsSupplier.html?id=113536430 Please follow this link to view the notice. ## Provenance This Markdown file is an alternate public rendering of the D3 Tenders contract record. The canonical page is https://d3tenders.com/contract/?ocid=ocds-b5fd17-25f831be-e278-45de-ba56-42465ff8de0f. The underlying structured data is available as OCDS JSON at https://d3tenders.com/contract/ocds-b5fd17-25f831be-e278-45de-ba56-42465ff8de0f.json.