How to find out the size of the occupied area of ​​an object?

Question

Unity

Let's say I have a tree object that occupies an area of ​​1x1, but there is also an object that occupies an area of ​​2x5, for example, how do I know that it occupies such an area?

The objects themselves consist of an empty object (containing only a transform) and it already includes its components.
Let's say I need to build a tree or a house on the stage, I need to know their size in order to calculate by size whether the given object falls into the free area.

I thought at first to set the scale for the main object, but then it affects all the components.

Tell me how to do it right? (For example, building objects in strategies so that they do not climb on top of each other...)

Answer 1

Recently there was a video on YouTube on this topic: https://www.youtube.com/watch?v=QmJRq1GTL4g
The size is set in the property of the object, and when it is placed on the stage, it is checked whether it enters other objects or not.