It is recommended to contact a contractor in your local area for more accurate budgeting. The Costs of Stamped Concrete. Simple Design. $6-$10 per square foot. May include one coloring method or decorative technique.Custom Design. $10-$15 per square foot. May include two or three colors or a contrasting border.t is recommended to contact a contractor in your local area for more accurate budgeting. The Costs of Stamped Concrete. Simple Design. $6-$10 per square foot. May include one coloring method or decorative technique.