Update on works to build South Ruislip Headhouse – August 2025
Work item: HS2-SCS-25-1176
Work Item Summary
- Project Phase
- Phase 1
- Region
- Hillingdon
- Location
- South Ruislip
- Worksite Name
- South Ruislip
- Contractor
- SCS JV
- Type of works
- Construction
- Estimated Start Date
- 04/08/2025
- Estimated End Date
- 31/12/2025
What we are doing
We wrote to you in April 2025 about works to build the headhouse at the South Ruislip site. A headhouse is the building on top of the ventilation shaft which contains the fire control and ventilation systems for the railway tunnels below.
The reinforced concrete headhouse structure is now complete. It includes twin chimney stacks for the tunnel ventilation system and the lift and stairs area for emergency service access.
We are now installing the steel frame structure and the brickwork facade. Following this, we will fireproof the building and install concrete floors and internal walls.
We have also completed the base slab and steel frame for the auto transformer station (ATS) within our site boundary. The ATS will be used to power the headhouse. In August and September, we will install fire protection, cladding and flooring in the roof area of the ATS.
The attenuation tank, which will capture excess surface water such as rain, is nearly complete. In August and September, we will install waterproofing and complete the main structure. We will backfill the area with soil and gravel.
We will provide regular updates as we continue to build the headhouse.
For further details follow the link to the August 2025 notification below.
Download information relating to these works
Find out more about
If you have a question about HS2 or our works, please contact our HS2 Helpdesk team on 08081 434 434 or email [email protected]