A contractor can charge more than the quote for a variety of reasons. One of the most common reasons is that the contractor underestimated the cost of materials or labor needed to complete the job. If the contractor discovers that more materials or labor are required, they may need to charge more than the original quote to cover the additional costs. Additionally, if the scope of the project changes or if unforeseen circumstances arise, the contractor may need to adjust their quote accordingly. Finally, if the contractor is in high demand and has a backlog of work, they may be able to charge more than their original quote due to increased perceived value.