The purpose of a written change order is to:

A written change order serves as a formal document that outlines modifications to the original terms of a construction contract, particularly changes to the scope of work, cost, or schedule. The primary purpose of a change order is to accommodate alterations that occur during the construction phase, ensuring that all parties involved have a clear understanding of what adjustments have been made.

This document helps maintain a record of the changes, which is crucial for tracking project progress and for any future disputes regarding the work performed. It not only protects the interests of the contractor but also the client, by providing an official acknowledgment of agreed-upon changes.

The other options do not accurately reflect the primary intent of a change order. Changes made before the contract is signed pertain to the initial negotiation phase, while informing suppliers or subcontractors about new materials or changes does not capture the comprehensive purpose of documenting those changes within the formalities of the contract. A written change order provides a binding agreement on modifications, ensuring clarity and accountability throughout the project.