In Kansas City, most pressure treated wood deck builders charge $70 to $90 per square foot installed, including the substructure (joists, posts, and beams) stairs and railing. The height of your deck, style, design, options and material choices will all affect your final cost per square foot.  A 200 square foot pressure treated wood deck with stairs and aluminum railing, for example, would cost between $14,000 and $18,000 from a reputable, licensed and insured pressure treated wood decking contractor in Kansas City.