The work will involve construction of properties to add to the group's 34,000 homes in East Anglia, Midlands and the South.
It is split into six lots and Orbit expects to appoint three contractors to each one. All lots include construction or design and build contracts and are split into work up to ВЈ1.5m and work over ВЈ1.5m in each of the group's regions.
The deadline for tenders is 30 October.
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