Defence Online

Type of document: Contract Notice
Country: United Kingdom

1. Title: TUNNEL SHAFT ACCESS STAIRCASES – SIZEWELL C
2. Awarding Authority: Sizewell C Limited, GB Email: lee.barker@sizewellc.com. Web:
3. Contract type: Public works contract
4. Description: This following statement summarises the high-level scope. A detailed specification will follow with the formal ITT issue.
Within the CWA Marine and Tunnel(M&T) portion, the scope of works includes the execution of the onshore tunnel access shafts and the accesses to undertake the tunnelling activities in the coming years. Each of the three shafts to be built by M&T will require a vertical stair access throughout shaft excavation works as well as tunnelling activities (4-5 years duration). Supplier shall design, fabricate, deliver, and assemble proposed staircase on each shaft.
Currently under design, shaft depth will be around 30-35 meters and preferrable option to look at top-down methodology of stair access, guaranteeing adequate anchorage of the structure as progress down the excavation. Stair system proposed shall account for intermediate rest platforms and sufficient width for emergency purposes (stretchers).
5. CPV Code(s): 45251100, 44233000, 63712320, 45221247
6. NUTS code(s): UKH, UKH1, UKH14, UKI
7. Main site or location of works, main place of delivery or main place of performance: Delivery point Leiston / Ipswich
8. Reference attributed by awarding authority: Supply chain ID 183395-SZC/Civils
9. Estimated value of requirement: Not provided.
10. CompeteFor response deadline 10.4.2026 (17:00).
11. Address to which they must be sent: Note: This is a CompeteFor opportunity. Opportunities may be with both public and private sector businesses. To apply, please click the following link to register on the CompeteFor portal Web:
12. Other information: Opportunity Method Contract Opportunity
Opportunity Status Open
Opportunity Type Private Sector
Notice Type Notice
Supply chain ID 183395-SZC/Civils
Nature of Opportunity Services
Estimated contract value (GBP) Not disclosed
About the buyer’s selection process:
Sizewell C Limited, hereinafter referred to as SZC, is proposing to construct a 3.2-gigawatt nuclear power station in Suffolk (Sizewell C) to provide reliable low-carbon electricity.
The purpose of the CompeteFor platform is to allow suppliers to express interest in upcoming packages at SZC and where required provide information regarding certain minimum requirements to ensure that we identify those who are deemed to be competent to provide the Works/Services to register their interests. The supplier is provided opportunity within the supplier statement to highlight any mitigating circumstances and lessons learnt that may be required to be shared with SZC based on your answers to the mandatory questions.
If required we reserve the right to request further information with respect to the information provided within the supplier statements.
At its sole discretion, SZC reserves the right to utilise these supplier statements to amend the scoring to the mandatory questions if the organisation can appropriately demonstrate that they have implemented learning and appropriate mitigations.
Depending on the details/answers you will be providing, a long list will be created and if selected, you will be invited to take part in the Pre-Qualification (PQQ) process. PQQ documentation will be made available for download by suppliers through the Group Procurement Portal (GPP).
The internet address for the GPP is:
SZC will be the Employer for the works/services detailed in this opportunity. The selection to participate in this opportunity, whether following a prior pre-qualification or not, does not alone signify approval of a Tenderer.
Note: The GPP will be the only channel available to Tenderers for communication during the tender process and shall be used to submit any questions, requests for clarifications, requests for further information, or other issues the Tenderer wishes to raise.
About the buyer:
SZC will be one of the largest infrastructure projects in the UK. It is important that we operate openly and transparently and demonstrate our commitment to delivering wider benefits across the UK, levelling up the regions, and operating ethically and sustainably throughout the project lifecycle. For that, we :
Are focused on supporting smaller, local businesses.
Are committed to promoting gender balance and have signed up to the Gender Target of 40% women in the nuclear industry by 2030, and 50% women apprenticeships by 2031
Are maximising the environmental benefits of SZC through low carbon construction methods.
Have already begun to benefit local communities and we have invested to support initiatives to reduce crime, tackle homelessness and provide training opportunities.
Will be proactive and encourage social mobility by ensuring that up to a third of the workforce on site will be recruited from the local area, using a Jobs Service to make accessing roles easier and break down barriers to work
Are committed to being a good steward of the local area and have held several consultations to understand key biodiversity issues in the area.
Details of specialist staff required (if any) N/A
Estimated tender close date 31/07/2026
Estimated contract award date 18/09/2026
Estimated contract start date 01/02/2027
Additional information for bidders Include any special notes for bidders It will be beneficial for you to describe your business as much as possible and highlight where you can help us to achieve our values described above.
Please provide case studies of recent projects where you have carried out similar activities, detailing, client, contract value, programme period and any innovation involved on the project. Please submit these via e-mail to lee.barker@sizewellc.com
TKR-2026331-EX-1868942