Add about 6 sf for labor
shotcret cost $65 to $130 a yard is equipment labour need only to place and finish shotcrete. add set up for less than 100 yard
you figure lengtH TIMES WIDTH TIMES heigth then add material cost per foot
add them all then divide by 4 then multiply x2
Multiply the length of one wall by the height to give you the square footage of that one wall. Then repeat for all other walls in the room and add up the total.