Hi there, my name is Vanessa Yaguas, civil engineer and interior designer. I have worked in a lot of residential projects for US, as a designer, drafter, etc. I can offer to you a set of drawings for your addition, including: floor plan, roof plan, elevations, sections, etc. As a civil engineer, I can deliver to you drawings that include the framing information, as you require. I have worked with different US codes, such as IBC, IRC and council's codes from different states.
First of all, I saw you PDF but you only show a rough perimeter line of the building, I will like to know if you have drawings of the existing house, in my opinion, it is important to show the existing house in the new drawings (maybe the council will require that). After that, we can discuss about the changes you are going to do so I can start the drawings. Also, if you want, I can search in the council's website for standards and regulations.
Feel free to contact me to discuss these items and more, I'm here to help.
Looking forward hearing from you.
Regards.