MEP Survey for T5D Attenuator Overhaul at Heathrow

Buyer: Costain Limited (H7-Heathrow)Region: London, United KingdomValue: £5.0MCloses: 9 Jun 2026 (1d)

Costain Limited seeks an MEP (Mechanical, Electrical, Plumbing) subcontractor to survey and design replacement of four end-of-life attenuators in the T5D Rail-tunnel Ventilation Shaft at Heathrow. The work involves detailed surveys during non-operational hours, MEP systems assessment, and design documentation (RIBA 4ii/4iii) to ensure compliance and improve tunnel safety.

Key requirements

▸Understanding of operational railway network constraints and attenuator replacement requirements
▸Capability to conduct surveys during non-operational hours in T5D Shaft (Level 6/7 access)
▸MEP systems expertise: air path, fan, attenuator and structural assessment
▸RIBA 4iii design delivery and compliance review capability
▸Heathrow or comparable critical infrastructure project experience

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