ca   roles  and  responsibilities - 9 - CONTRACT INSTRUCTIONS / VARIATONS​​
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In the majority of cases, contract instructions will be generated by either the design team or the contractor. Circumstances in which this may occur include:

• the issue of detail design drawings clarifying what is required
• instructions to place orders with specialist subcontractors
  
• the contractor requiring clarification of the contract documents
• additions, omissions or variation to the works
  
• instructions for the expenditure of provisional sums
  
• emergency action taken by the contractor
  
• opening of completed works for the CA to verify compliance with the building contract
• dealing with unforeseen situations that have arisen on site.

It is solely the CA’s responsibility to issue instructions which should be given in writing and issued promptly when required in accordance with the building contract provisions.

The CA will need to be aware of the cost implications of issuing instructions (which may be additions, neutral or deductions). The calculation of those costs should be in accordance with the rules set out in the building contract. Where such instructions give rise to additional costs outside the building contract provisions, or the CA’s appointment, then the employer’s approval for the
expenditure will need to be sought before the
instruction is given.

The CA should consider the impact instructions will have on the programme and sequence of works, as well as the contract completion date. The CA should make the employer aware of the implications.

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