It is now estimated the contractors’ panel could be used for £1bn worth of projects, almost double the original spending estimate over four years.
Up to a dozen firms will be placed on the new framework next September giving the existing members a lengthy wait to find out if they retain places.
The existing 10 members include Bam, Builders consortium south west, EW Beard, Interserve, ISG Pearce, Kier, Mansell, Midas, Morgan Sindall and Wates.
The framework, which excludes civil engineering, is supported by 28 public bodies in the region, including police and fire authorities, universities and local councils and will cover jobs valued over £1m with some expected to exceed £30m.
Interested firms can register at the tendering website by 5.11.12.
Further information at http://www.CFSW.org.uk/ or Mike Newport, Devon County Council, tel: 01392384623