Required. According to relevant public information inquiries, ordinary project changes only require the signatures of the contracting party and the contractor. Changes to state-owned enterprises and institutions are expected to be discussed at meetings or approved by the competent authorities. If you have any questions, please contact us for feedback. Under normal circumstances, a change order should be signed and confirmed by representatives of the construction unit, design unit, supervision unit and construction unit, and then the change order will be issued by the chief supervisory engineer before it becomes effective.