This is my first post so be gentle with me lol.
Im building a 7 x 7m garage. I was doing a cavity wall and was advise to do the foundations 600mm wide and 800mm deep using an ST3 concrete. Im now doing a single block with piers. Can anyone suggest what width and depth foundation I should use, Im presuming it will be smaller.
Also how thick should my hardcore be for the oversite?
Thanks in advance