I contract to design the facility with client after oftained approval about the contents of presentation.
The contract documents contains about rewards and its payment, copyright, et cetera. In case of interior design, I request that clients pays rewards in 4 times installments.
1st. At contract finished
2nd. At basic design finished
3rd. At detail design finished
4th. At construction finished
This system avoids that clients pays too much expenses when the project unfortunately stopped on the way. And I also avoid working for nothing.
About copyright, I'm sure to keep it mine, so I can promote the facilities as my works.