Extension Spreadsheet

Hello

Sorry if this has been answered before but I can not find a spreadsheet which lists all the building materials for a typical extension/renovation, so that I can basically price up our extension and put in and take out certain finishes so that I get a figure I am happy with. I have searched the internet for cost estimators and they are OK however our extension is very basic (ie no bathrooms, drainage etc) and having a per sq meter price is a bit vague and I would like to present the minister of fun and finance with a comprehensive cost estimate. I have a sloping block and want a double garage underneath (52m2) and living room (36m) on top with a decking, when I just use the $2000-$2500 per sq m I come up with $176-$220K.... I think this is pretty high but would like to be a bit more specific...does anyone have a spreadsheet they can recommend or a program?

Lastly if this is in the wrong section could you please let me know, I assumed here or possibly the owner builder section?

Anyway thanks in advance

Rob


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