You will almost certainly need a container one size bigger than you think you need.
Carpeting, scrap wood, drywall--all of these waste products take up volume.
Concrete, rock, and dirt are more weight than volume, and usually you can only fill
the container quarter full (verify this with your rental company). Finally,
containers of similar volume may come in different dimensions. One dimension that
you want to ask the rental company about is height. It's hard to heft weighty
materials over the side of a high container, so ask if you can get a lower
container. •10 Cubic Yard Container. Imagine a metal box twelve feet long, eight
feet wide, and four feet high. That's a ten yarder. It won't get you very far. If
you're tearing out a small bathroom, the ten yarder might be right for you.
•20 Cubic Yard Container. Twenty-two feet long, eight feet wide, four and a half
feet high. This is about the minimum size container you should ever get. This would
accomodate the waste from a small bathroom without cramming and crushing.
•30 Cubic Yard Container. The thirty yarder is the optimal size. This fits in front
of most house without too much complaint from neighbors. You can fit carpeting,
drywall, and wood in a thirty yarder without too much trouble. Also, if you're
disposing of concrete or rock, you'll need a larger container since you can't fill
the container up very high.
•40 Cubic Yard Container. The forty yarder is a monster rolloff meant for real
renovation work. I like it because I hate having to cram the waste materials in.
Imagine a metal box with the same length and width as the other containers, but a
full eight feet high. That's a forty yarder, and it will serve most of your needs.