Which of the following is NOT a valid reason to submit a complaint against a contractor?

Submitting a complaint against a contractor typically involves issues that compromise the integrity, legality, or overall quality of the work performed. Valid reasons for complaints often include failures that are significant and relate to the contractor's obligations under a contract, such as fraudulent practices or misleading advertising, which can directly affect consumers and the industry as a whole.

Disagreement over design changes, on the other hand, generally falls into the realm of project management and expectations set forth between the contractor and the client. While it can be a source of conflict, it does not typically constitute a valid basis for official complaints since it may arise from misunderstandings, communication issues, or varying interpretations of the contract. This type of disagreement is often negotiable and involves discussion rather than formal action against the contractor.

By identifying a disagreement over design changes as not a valid reason to file a complaint, individuals are encouraged to resolve such issues through dialogue and professional negotiation instead of escalating them to a complaint level.