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The estimated costs and carbon emissions for the options being considered for the Pant-Llanymnech bypass.

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First published:
21 April 2022
Last updated:


19 April 2022

Dear                  ,

ATISN 16206

Thank you for your request for information dated 26 March.

Information requested

The latest estimated costs and carbon emissions for the various options being considered for the Pant-Llanymnech bypass.

Our Response

I can confirm that we hold some information relating to your request.

The latest projected outturn costs for the 5 selected options under consideration are as follows –

Option 1 – £6.4 million

Option 2 – £165 million

Option 3 – £233 million

Option 4 – £265 million

Option 5 - £378 million

At this stage of the project development the proposed options are not at an advanced enough stage to be able to calculate any meaningful embedded carbon computations.  However once the alternative options have been narrowed down to a short list a calculation will then be undertaken.

Next steps

If you are dissatisfied with the Welsh Government’s handling of your request, you can ask for an internal review within 40 working days of the date of this response. Requests for an internal review should be addressed to the Welsh Government’s Freedom of Information Officer at:

Information Rights Unit, 
Welsh Government,
Cathays Park, 
CF10 3NQ 
or Email:

Please remember to quote the ATISN reference number above.

You also have the right to complain to the Information Commissioner. The Information Commissioner can be contacted at:

Information Commissioner’s Office, 
Wycliffe House, 
Water Lane, 

However, please note that the Commissioner will not normally investigate a complaint until it has been through our own internal review process.

Yours sincerely