Building Certification Jobs

I need to have a complete building plan (Archi Plan, Structural Plan, calculations and Title 24 ) for my projects to be approved by the city. 1. Building Plan to build a 1000 sq. ft. - 3 bedroom 2 bath ADU in the backyard. 2. Building Plan to add ~495 sq. ft. - 3 bedroom 2 bath and a laundry area to the rear of the existing house. The plan will require a local professional engineer's STAMPs in order to be approved for permits. see attached detailed site plan.

I have made alterations to my garage and erected fencing to the front part of my home. I was advised at the time I didn't need any permissions or warrants, which I have since learnt was incorrect. I please need these to be put in place now.

I am purchasing a property privately and need some help calculating the square footage along with drawing up a floor plan of the property.