Three weeks into a project, the owner requests a design modification. Your crew is already on-site, materials are ordered, and the schedule is locked in. You verbally agree to make the change to keep the project moving, figuring you'll sort out the paperwork later. Fast forward to billing time, and suddenly there's a dispute about what was agreed to, how much it should cost, and whether you're even entitled to payment for the extra work. This scenario plays out on constructio