If you want to find the last column used in a particular row you can use: Using used range (less reliable): Using used range wont work if you have no data in column A. See here for another issue with used range: See Here regarding resetting used range.
Our free calculator uses recent, trusted data to estimate costs for your Drywall Skimming project. For a basic 500 square feet project in zip code 47474, the benchmark cost to Skim Coat ranges between $0.95 - $1.16 per square foot* .
Since we subtract the cost of building a shaft, your total cost will be about $750 less than adding new skylights to a roof with full attic. Thus, adding a new skylight to a cathedral ceiling roof should cost about $2000-3800 depending on the details.