Reimbursable expenses: your contract must contain a clause stating that your client agrees to reimburse you for all expenses incurred in connection with the interior design project. For example, your customer would reimburse you for travel expenses (if any), shipping costs, storage costs, etc. Since interior designers have been paid, they are non-refundable, even if the purchased items are returned. In cases where a customer is not satisfied with the decisions and tries to make noises, every designer will understand why this clause is indispensable in the agreement.. . . .