how to find the certificated constructor for renovation?

Hi Guys,
I am a newcomer to this area. currently, I want to do some renovation in my house, the main part is the kitchen. I planned to take down the wall between the kitchen and living room, also the wall between the kitchen and hall as much as possible, but I do not know exactly how much I should leave? because the walls support the second floor.

So based on that, who I can contact to ask? I guess the certificated constructor should have the ability to do this. But where can I find them? or do you have any recommendation? I think maybe also the inspection company also can do this job, for instance, Anticimex?

Thanks a lot!

 

Thanks a lot, Viktor. I will search on google to find "byggnadskonstruktör" and ask for home visiting inspection and checking.

 

Tack Viktor!