Want to build ADU in Bayarea CA

[Vipul Parikh]

Hi

I am planning on building a ADU in Union City, CA . I have 8750 sq ft lot and I can build upto 800 sqft of ADU. Here are some of the questions

1. I spoke to the city and got confused on how city permit works. Not sure , if I need to hire a Architect and structural engineer or either will work?

2. regular construction / modular /prefab or premade panels?

3. My property is not square or rectangle shape . It is longer on one side and shorter on other side. Can I still go to modular constructions ? 

4. Is $225 /sq ft norma for modular ?

5. Should I get a architect /structural engineer (atleast 3k) , get a plan made and then get some quotes for regular build ?

6. Any idea on how is prefab / sq ft?

Thanks