Engineering/architecture recommendations and cost estimates

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I have been trying to get some engineering plans of a 2 story building done. 

The bottom story will be a 2/2 and the upper unit will be a 2/1. 

The area is a R4 zoned and it currently has 6 units on it. 

Just to submit plans and drafts to the city we are looking at 10-15k. Does that sound correct? I’ve been getting pricing anywhere from 10, 15, to 20k

I am located in Southern California. Any recommendations on engineering/architectural firms?


Thank for the replies!
Brian