Let’s say you measure 30W by 60H. Multiply the height by width and divide by 144 to get the total square footage (30 x 60 /144= 12.5 sq ft). Plantation shutters are priced per square foot and can range anywhere from $30.00 a square foot to upwards of $45.00 sq ft (depending on the manufacturer).So there you have it! Don’t let the cost of plantation shutters deter you from calling a window treatment company for an interior shutter consultation.et’s say you measure 30W by 60H. Multiply the height by width and divide by 144 to get the total square footage (30 x 60 /144= 12.5 sq ft). Plantation shutters are priced per square foot and can range anywhere from $30.00 a square foot to upwards of $45.00 sq ft (depending on the manufacturer).