Cost to repair plaster walls measured in terms of problem: Plaster walls can be amazingly long-lasting, and usually, only small areas are damaged at a time. Many plaster repairs are charged by the square metre and per hole or crack. Depending on the severity and amount of damage, prices can fluctuate. Following are some of the breakdowns of the costs. Nail holes can cost up to 80 dollars per square foot. Cracked holes can cost from $100 to $300 per hole. Simple holes can cost from $80 to $150. Cracks due to leaking Water can cost $100 per square metre. Repairing a crumbling plaster can cost up to $100 per square metre. Repairing a sagging plaster ceiling can cost up to $350 per square metre. https://utm.io/udduV