What should I clarify about who gives instructions under a building contract?

Define authority before work starts

Ask who is authorised to instruct the contractor: the owner, architect, engineer, project manager or another named person. Clarify whether authority covers routine coordination only or also changes to scope, materials, time or payment. A person who observes work or sends progress notes should not automatically be treated as authorised to vary the contract.

Confirm how instructions must be issued, what details they need and when the contractor must acknowledge them. Agree how urgent safety or damage-prevention directions are handled and documented afterwards. Make sure every party knows whether messages, meeting minutes, marked drawings or formal instruction forms are the controlling record.

Prevent conflicting directions

Use one shared instruction log with dates, responsible person, drawing or area reference, decision and any agreed effect. Ask the contractor to flag a direction that conflicts with the contract or current design before acting. Avoid giving informal instructions directly to tradespeople if the contract requires communication through a representative.

Changes affecting design, permissions, cost or timing should be reviewed by the relevant professional before approval. Have a qualified Greek lawyer explain contractual authority, variation mechanisms and consequences. Do not assume that an informal working practice changes the contract. Ask your lawyer what effect the agreed terms, conduct and communications have, and how any intended change should be documented.