The existing National Improvement and Efficiency Partnership framework agreement is up for renewal in August 2013.
Ten firms on the existing Construction Framework South West now face a lengthy rebid process for places on the successor agreement for the next four years.
The existing line-up includes: Bam, Builders consortium south west, EW Beard, Interserve, ISG Pearce, Kier, Mansell, Midas, Morgan Ashurst and Wates
The renamed South West regional framework agreement will cover projects valued over £1m with some expected to exceed £30m.
Its organisers say the deal will be worth up to £500m over the course of the programme, which is supported by 28 public bodies in the region, including police and fire authorities, universities and local councils.
Interested firms can contact CFSW, tel: 01392 382444 or Mike Newport, Devon County Council, tel: 01392384623