The excavation contract, which defines the research project and all relevant conditions, is signed by the developer and the contractor. The research project mentions the means and procedures to be employed, the methods and techniques to be used, and the necessary human and material resources. It is established by the contractor based on the curator's specifications.

The contract states:
- the projected starting date of the excavation, its duration and cost
- the conditions and dates of availability of the site and of the excavation
- the penalties to be paid by one or the other parties if the specified time limits are not respected
- the date when the final excavation report will be handed in.

If the developer is an official body, subject to public regulations, the contract also mentions the relevant requirements.