480. When the remuneration is payable.

The contract will generally make provision for payment by instalments1. If the engagement of the architect or engineer is a construction contract2, he will be entitled to payment by instalments save in very limited circumstances3.

If the contract is one to perform an entire work, such as to prepare plans, drawings and the specification for a fixed sum, or for a percentage of the whole cost of the work, then (unless there is express, implied or statutory provision for periodic payments) the right to payment does not arise until the whole work has been done

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