Hi guys in the process of building a small garage in my and as it is under 2.5M, far enough away from the house ect so no planning is required. However i am still building to the local building guidelines ect just in case i want to go bigger in the future. The issue i am having is that i have reached 1M down on 3 of the sides and i have lovely sand and compacted stone perfect for me footings. But on the one corner i have just hit sand and clay and have gone down another 30cm right now. The original plan was to go down 1m, across 50cm and have 60 cm concrete and trench block up to DPC level. My question is once i have removed the extra clay soil do i have to dig the other 3 sides of my footing down to the same depth. which could go to 2M or can i remove everything and then fill and compact to that 1m level or step the footing and have a few extra courses on that corner. The annoying thing is it is right on the corner going 60cm each way. Any help would be welcome and i have debated asking a question for a long time i just normally see a few people get involve get a little carried away and religiously quote building regs or have an argument. So yeh guys i am grateful for anything i get back.