Hoarding Cleanout carries its own considerations, chief among them that it is a clearance that needs discretion, protective equipment and a realistic timeline. Here's what separates a smooth pickup from a frustrating one: biohazard or pest conditions can require specialist attendance before a container is any use at all.
Two ceilings apply to every load: how much fits, and how much is allowed to weigh. Dirt and concrete hit the second one first; furniture and boxes usually hit the first. The booking pattern here skews toward families and property managers, since the job produces a fairly predictable volume of debris, which is why 20 or 30 yard containers cover most of what actually gets ordered. Two facts move this along: the rental window you need, and any item in the pile that requires separate handling.
With the scope not yet fixed, what ends up in the container is hard to know ahead of time, so treat the first size as a starting estimate rather than a final order. Settle who is responsible for driveway damage. Concrete cracks and asphalt divots happen often enough that some haulers offer boards to spread the weight, others don't. Guessing big to be safe usually costs you as much as guessing small and running short. Describe the job honestly and skip both mistakes.