Changes are an unavoidable aspect of construction. Although thorough effort and coordination are required in preparing the original project contract, specifications and construction drawings, there will still be changes. This is why owners are provided the right to make changes to the work under a typical contract changes clause.
However, the ability for owner requested changes, even if provided in the contract, are not without limitations, restrictions, and consequences. After all, what purpose would any of the project documents, contracts and drawings serve if they were subject to constant change? What good would the contract serve if the owner could make any change(s) without consequence?