Without which document do customers not legally have to comply with additional cost requests?

The correct answer is Change Orders. Change Orders are formal documents that outline any changes to the original plan or agreement, including alterations in project scope or additional costs. Without a Change Order, customers are not legally obligated to agree to additional costs beyond what was established in the original agreement or purchase contract.

This is crucial in residential construction and sales, as it ensures that any modifications are mutually understood and documented, providing legal backing for both parties. If a contractor seeks to impose additional charges without a Change Order, the customer has the right to refuse those extra costs.

In contrast, Purchase Agreements, Invoices, and Contracts each serve different roles in the transaction process but do not specifically address the modification of costs related to changes in scope directly like Change Orders do. A Purchase Agreement outlines the terms of the sale but does not typically cover changes after the agreement is signed. Invoices provide a summary of charges after services have been rendered or goods delivered, and while Contracts set the overall agreement, they may not cover informal changes unless explicitly detailed in accompanying Change Orders.