Input on turn a 24'x30' garage into a 720sf apt

[Beth Gorman]

Looking to turn a 24'x30' garage into a 720 sf 1bd/1ba apartment and seeking input on construction concerns and ideas of interest I need to take into consideration when costing out this conversion.  Located 30 mins north of Milwaukee, in city of Hartford.  Garage is on separate city lot adjacent to my current residence, with own city water and electric, however need to bring utilities to garage from street hookup.  Garage is slab on grade with no footings. 

Any and all thoughts welcome and appreciated.
Thank you in advance for your time! 

Beth Gorman