Gas appliance replacement

Interior demolition: category i structural alterations interior work 8 sq ft - install 2x4 wall studs @ 16" o c on interior walls 2x6 @ 16" o c on ext. Walls. Replace drywall on walls & ceilings - replace 14 windows same size and location. Replace 9 interior doors same size and location. New kitchen cabinets flooring. Install concrete front porch 7 x 14 x 9" thick replace front sidewalk 4w x long x 4" thick install rear sidewalk 4 w x 15 long x 4" thick. Install 9 x 12 rear porch with 3 wide steps - 7 1 2" r 12" tread. As per code. As per sketch.