This question cannot be answered, meaningfully without much more information. It is akin to asking "How much does a car cost"?It depends on MANY factors such as: 1)the scope (i.e., what is included...
Last one I did was 3 weeks ago and I charged $12,893 and it was under capitol improvement thus no tax was charged but there was filing fee's and the designers fee
New housing after supply/labor is around $120 sq/ft.
Remodeling existing house is around $50 sq/ft.
Some crappy old homes arent even worth remodeling due to asbestos, lead paint, faulty wiring, etc....