Professionals needed for a Room Addition

[Dale Nesmith]

I have 2 story home that I am doing a total rehab on soon. I am thinking of doing a 2 story addition that would be easy to do as it would square the shape of the house.

On the first floor I want to add a full bath and above it add space to the smallest bedroom that would make it a nice size bedroom.

We would just have to put down a foundation and frame up an area roughly 12x10. Then run plumbing lines to new bath. Also, extend roof over new part of bedroom.

My question is what professionals do I need to do an addition. Is a Contractor enough? Do I need an architect? Any other professionals I’d need?