Load-bearing terrace? Seeking structural engineer-type.

Hello,

I live in (rent) a typical maison de maître/townhouse, with a large terrace out the back. The terrace does not jut out, and it is a "proper" terrace (not just me walking on top of downstairs' roof). Still, I've been putting some large-ish plants on it and it occurred to me I ought to check what sort of load it might bear. Just to be on the safe side. 

Who would do this in Brussels? Do I need a structural engineer/surveyor - and has anyone any recommendations for someone willing to take on a small job?

Thanks,

Emily.