Site levels are the bare minimum you’ll require to competently prepare a building design on a site. This process is ideal for a new site, or a site that is to be cleared of all buildings for a new development. They allow you to anticipate the height of a building relative to ground levels and recession planes, and are also handy if there is a minimum floor level set by Council. They are also handy if you want to drain stormwater to the road boundary.
We suggest you get these before you put pen to paper (or mouse to mouse pad). It can save a lot of horsing around later. We do these in terms of Council datum so you can relate them to Council drainage information and minimum FFL’s. Trying to design a building on a site without levels is like trying to ride a bike without a chain. Sort of possible but not that successful.