Ongoing site projects
Building 100
Renovation and extension of Building 100 to modernise CERN’s Main Workshop and support long-term technical and manufacturing activities.
Schedule: 2025 – 2029
Building 893 (CT2)
Extension of the CT2 cooling tower facility to support CERN’s cooling infrastructure and future operational needs.
Construction/renovation phase: September 2026 – May 2027
HL-LHC Vertical Cores
Construction of the HL‑LHC vertical cores, the final civil engineering component required to complete the new infrastructure supporting the High‑Luminosity LHC.
Construction phase: November 2026 – September 2027
Prévessin site entrance
A redesigned entrance combining security, green spaces and soft mobility.
Construction phase: 2027
Building 889 (BA80)
A renovation project to preserve and strengthen a strategic access and technical services facility.
Construction phase: 2026 – 2027
Building 41 Retention Basin
Conversion of a decommissioned drinking-water storage tank into a stormwater retention basin to improve stormwater management and resilience to heavy rainfall.
Schedule: June 2026 – December 2026
Building 376-377-378
Renovation of the façades to improve performance, extend service life and enhance the technical complex.
Construction phase: September 2026 – July 2027
Building 738 (IBDRS)
Upgrading the ISOLDE facility to improve reliability, accessibility and long-term operation.
Construction phase: 2026 – 2027
Building 3189 (SA18)
A new multidisciplinary research facility dedicated to superconducting RF technologies and accelerator components.
Construction phase: 2026 – 2031
Building 754 (HI-ECN3)
Upgrading CERN’s North Area with a new experimental facility for the SHiP programme and future particle physics research.
Construction phase: 2028 – 2030