More than 20 firms will be battling to retain their places on the framework which saw BAM, Bouygues, Bowmer & Kirkland, Kier, Morgan Sindall and Willmott Dixon secure the major project lot last time around.
Carmarthenshire County Council, in association with Neath Port Talbot County Borough Council, Pembrokeshire County Council, Ceredigion County Council and Swansea Council, will use the panel of firms.
The framework will also be open to blue light services and NHS Trusts to construct, refurbish and repair buildings for the next four years, until 2024.
A bidders day will be held on 22 May at the Quinnell Lounge, Parc Y Scarlets, Llanelli.
Book via Eventbrite.
Following the main market engagement event, Business Wales will be holding a drop-in Sell2Wales and eTenderWales Workshop at 1.30pm in the same venue for interested contractors.
Contact Carmarthenshire council for further information.