Price for planning the outdoor facilities

Hello,
I wanted to ask how you went about planning your outdoor areas.
Because of the slope, we need a professional in two directions.
I have contacted various landscaping companies and received very different statements.
First of all, it’s about the planning ... I completely understand that this costs money, but no one really says anything, except for two:
- 1st provider: planning 400 euros + tax, 50% credited upon contract
- 2nd provider: planning 750 euros - tax, 20% credited upon contract
All the other providers are evasive, how am I supposed to find a suitable one?

Do the companies then give me a (realistic) cost estimate?

What is usual for planning?
Thanks, Hilly

If someone cannot give you a suitable cost estimate, you simply should not give them the order. Otherwise, you might end up looking pretty foolish. Tell the other providers the same, maybe they will soften up and give some numbers.