The short answer
Scope, specification, rate basis, payment milestones, timeline, penalties, variation pricing and defect liability.
A workable contract states the scope and drawing set it is based on, a specification schedule, whether it is labour-only or material-inclusive, the rate basis, payment milestones and the completion date.
Also fix how additional work is priced, who bears material wastage, what happens on delay, and the defect liability period after handover. Verbal understandings are the most common source of site disputes.
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