how to price out 20 ft. walls for Rasa Calce. Some walls are 20 ft. some are less. none under 12 feet. would appreciate input. about 4500 sq. ft. thanks

Your material wont change in price but labor will so i would consider scaffolding a seperate cost and at least 20% extra for labor. Up, down and getting materials to you. Maybe 30% but it depends on the other potential job conditions.