How do contractors handle clients who keep requesting changes after the job is done?

Scope creep after the job is finished can be frustrating, but handling it professionally keeps the door open for future work. Include a clear change-order clause in every contract stating that any post-completion work is billable at your regular rate. When a client requests extras, send a quick written quote. Most will either approve it or drop the request. If they're a good repeat customer, you can always offer a small courtesy discount on the first change to keep goodwill. This approach protects your profit while still showing you value their ongoing business.