Hi all, I'm just designing an extension for the house and I'm trying to cost things myself to see how much the total is going to be. I've done a bit of building before and have relatives in the trade too for help and also trying to do this on a v.tight budget so don't want to get builders in to do the work. The question is, are there any sights that will tell you the average costing of materials and lists the materials you will need to build an extension ? One of the things I'm looking for is how much concrete footings cost. Because there isn't access to the back of the house, I can't have a ready mix truck so will have to do things by mixer ! How much does a cubic yard of concrete cost ? Or to put it another way, how much Balast and Cement do you need for 1 Cubic Yard of Concrete ? Cheers, Richie.