alwys great to see a new garage been built, can you answer a question for me on the foundation? what is the width and depth of it? its not looking like 3 times the width of the wall its supporting

over here in ireland its a rule of thumb to do 3 times the width of the wall, so far agro sake a wall is 300mm/ 12" wide the founds would be roughly 900mm....im wanting to build a new garage myslef and would like to go the way you have your founds in....