Roll-Off Dumpster Rental carries its own considerations, chief among them that it is the general-purpose container that covers almost any job, sized from 10 up to 40 cubic yards. You'll want this settled before the truck shows up: the yardage describes space while the truck is bound by axle weight, so the tonnage allowance runs out first.
Yardage tells you how much room the container has. It tells you nothing about how much of that room you're actually allowed to fill with something heavy. The booking pattern here skews toward homeowners and contractors, since the job produces a fairly predictable volume of debris, which is why 10 or 20 or 30 or 40 yard containers cover most of what actually gets ordered. Know your timeline and know your restrictions. Those two facts get you a straight answer instead of a guess.
A whole-house cleanout combines light junk with the occasional heavy piece, so plan around whichever runs out first, the space or the weight allowance, since either one can end the load early. Get the swap-out cost in writing if the project runs past the rental window -- a second container costs less mid-job than a rush order arranged after the fact. A container that's half-empty and a container that's overflowing are the same failure: the wrong size was ordered. Give the real numbers and avoid either one.