---
title: "Trawsfynydd Reactor Buildings Height Reduction"
ocid: "ocds-h6vhtk-0389bb"
canonical_url: "https://d3tenders.com/contract/?ocid=ocds-h6vhtk-0389bb"
markdown_url: "https://d3tenders.com/contract/ocds-h6vhtk-0389bb.md"
json_url: "https://d3tenders.com/contract/ocds-h6vhtk-0389bb.json"
source: "Find A Tender Service"
current_stage: "Award"
buyer: "NUCLEAR RESTORATION SERVICES LIMITED"
published: "2025-10-07"
---

# Trawsfynydd Reactor Buildings Height Reduction

Buyer: NUCLEAR RESTORATION SERVICES LIMITED  
Current stage: Award  
OCID: ocds-h6vhtk-0389bb

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## Summary

The procurement process titled "Trawsfynydd Reactor Buildings Height Reduction" is managed by Nuclear Restoration Services Limited, focusing on demolition work within the works industry category. The location for this procurement is the Trawsfynydd Site in Blaenau Ffestiniog, Gwynedd, North Wales. As of the latest update on 7th October 2025, the process has reached the award stage, with Costain Limited being the awarded supplier for a contract value of £71,813,292. This was a competitive procedure with negotiation under the selective procurement method, compliant with the Public Procurement Contracts Regulations 2015. This project involves significant partial demolition, civil new build, and remedial works for decommissioning the nuclear reactor buildings, initially built in the early 1960s.

This tender presents substantial opportunities for businesses specialising in demolition, concrete repair, and decommissioning services. Companies skilled in scaffolding erection and dismantling, as well as the hiring of construction machinery, are particularly well-suited to compete in such a project. Additionally, with procurement focusing on quality and social value aspects, firms with strong technical capabilities and effective project management processes stand to benefit. The project's scale hints at a potential for long-term engagement, as ongoing decommissioning and site management create recurrent opportunities for expert service providers in nuclear decommissioning, civil engineering, and associated construction disciplines.

## Notice

Partial demolition of the two reactor buildings, reducing their overall height , together with an extensive package of civil new build and remedial works.

### Lot Information

Lot 1

NRS Ltd. is responsible for the safe and compliant decommissioning of Trawsfynydd Nuclear Power Station in Gwynedd, North Wales. Built in the early 1960's, the Site ceased generating electricity in 1991 and has been undertaking decommissioning works since. 
The next phase of the decommissioning programme will principally feature modification of the two former civil nuclear Reactor Buildings which, in current state, offer safe and secure storage of housed plant. The project will involve the systematic deconstruction and partial demolition of each Reactor Building, delivering a reduced height configuration compliant with existing planning commitments and lessening the visual impact on the landscape. In addition, a package of civil new build and remedial works will be delivered to prolong the durability of the retained structures and reduce disproportionate asset management liability. The end product will offer compliant protection of the stored inventory, ready for successor phases of decommissioning activity on the Site.

## Key Details

| Field | Value |
| --- | --- |
| Publication source | Find A Tender Service |
| Latest notice | https://www.find-tender.service.gov.uk/Notice/062969-2025 |
| Notice type | Planning Notice |
| Procurement type | Standard |
| Procurement category | Works |
| Procurement method | Selective |
| Procurement method details | Competitive procedure with negotiation |
| Tender suitability | Not specified |
| Awardee scale | Large |
| All stages | Planning, Award |

## Dates

| Field | Value |
| --- | --- |
| Publication date | 7 Oct 2025 |
| Submission deadline | Not specified |
| Future notice date | 23 Mar 2023 |
| Award date | 1 Oct 2025 |
| Contract period | Not specified |
| Recurrence | Not specified |

## Values

| Field | Value |
| --- | --- |
| Tender value | £53,000,000 |
| Lots value | Not specified |
| Awards value | Not specified |
| Contracts value | £71,813,292 |

## Status

| Field | Value |
| --- | --- |
| Tender status | Complete |
| Lots status | Cancelled |
| Awards status | Active |
| Contracts status | Active |

## Buyer

| Field | Value |
| --- | --- |
| Main buyer | NUCLEAR RESTORATION SERVICES LIMITED |
| Additional buyers | MAGNOX LIMITED |
| Locality | BRISTOL |
| Post town | Bristol |
| Postcode | BS35 1RQ |
| Country | England |
| ITL 1 | TLD North West (England) |
| ITL 2 | TLD6 Cheshire |
| ITL 3 | TLD61 Warrington |
| Local authority | Warrington |
| Electoral ward | Birchwood |
| Westminster constituency | Warrington North |
| Delivery location | TLL12 Gwynedd |

## Supplier

| Field | Value |
| --- | --- |
| Number of suppliers | 1 |
| Supplier names | COSTAIN |

## CPV Codes

### Divisions

- 45 - Construction work

### Codes

- 45000000 - Construction work
- 45110000 - Building demolition and wrecking work and earthmoving work
- 45111000 - Demolition, site preparation and clearance work
- 45111100 - Demolition work
- 45111200 - Site preparation and clearance work
- 45111300 - Dismantling works
- 45113000 - Siteworks
- 45200000 - Works for complete or part construction and civil engineering work
- 45210000 - Building construction work
- 45262100 - Scaffolding work
- 45262110 - Scaffolding dismantling work
- 45262120 - Scaffolding erection work
- 45262300 - Concrete work
- 45262310 - Reinforced-concrete work
- 45262330 - Concrete repair work
- 45262660 - Asbestos-removal work
- 45500000 - Hire of construction and civil engineering machinery and equipment with operator
- 45510000 - Hire of cranes with operator

## Release History

- 7 Oct 2025 at 14:41 - Award - Award Notice - https://www.find-tender.service.gov.uk/Notice/062969-2025
- 1 Dec 2022 at 08:02 - Planning - Planning Notice - https://www.find-tender.service.gov.uk/Notice/034017-2022

## Notice URLs

- https://www.gov.uk/government/organisations/magnox-ltd
- https://www.gov.uk/government/organisations/nuclear-restoration-services
- https://www.lcia.org/

## 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-h6vhtk-0389bb. The underlying structured data is available as OCDS JSON at https://d3tenders.com/contract/ocds-h6vhtk-0389bb.json.