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AwardedUnited KingdomWorks£71,813,292

Reactor Buildings Height Reduction (EXECUTION phase)

Published
Published 7 October 2025
Deadline
Closed 19 December 2024

Overview

The existing Reactor Buildings at Trawsfynydd are now life expired and require works to mitigate against further degradation, thus ensuring they remain safe and compliant for subsequent decommissioning activities. In addition there are long term commitments through the Town and Country Planning process to reduce the visual impact the buildings currently have on the landscape within the Snowdonia National Park. The Height Reduction project has therefore been implemented with the objective of reducing the height of both reactor buildings such that they are left in a safe and stable configuration for the next phase of works to decommission the Trawsfynydd site whilst significantly reducing ongoing asset investment demands. The reduction in height will also satisfy the requirements to lessen the visual impact the current full height buildings have within the Snowdonia National Park.

Key details

Country
United Kingdom
Status
Awarded
Category
Works
Estimated value
£71,813,292
Procedure
Selective
SME suitable
No
Published
7 October 2025
Deadline
Closed
Classification (CPV)
Hire of cranes with operator

Award outcome

Awarded value
£143,626,584
Award date
1 October 2025
Contract period
5 October 2025 → 29 March 2029
Winner
  • Costain Limited

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Notice history

Every published notice in this contracting process, newest first.

  1. Contract Award Notice

    7 October 2025

  2. Contract Award Notice

    7 October 2025

Contracting authority

  • Nuclear Restoration Services Ltd

    Buyer

    Trawsfynydd, United Kingdom

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Awarded: Reactor Buildings Height Reduction (EXECUTION phase) — won by Costain Limited — Skim