Thanks for the input guys. First, let me clarify that we are a landscape contractor company and do grading, drainage, irrigation, and landscape installations. We sub out masonry, wood, pools, etc. So our need for thorough construction documents is hugely important here.
I like what Brett said last. The preliminary plan is really a ‘schematic’ plan that is revised through DD to end up with a construction bid package. I just call it a conceptual landscape plan.
I find that the other disciplines rely heavily on the term Site Plan, so as a general rule, I do not use that term unless there is a requirement by a governing agency or HOA that specifically requires a drawing with that name.