Generally in JBCC® agreements the employer appoints agents to carry out the design – the contractor is not responsible for design / design coordination.
A n/s subcontractor may be appointed for a particular product / design application. . Such subcontractor indemnifies the contractor for any design responsibility and consequential losses.
Where the contractor is responsible for design, a separate “design + build’ or ‘turnkey’ agreement must be signed to deal with the risk and other obligations
See: 6.1P-7.1; 5.0P-4.1; 6.1N-7.2; 5.0N-4.2