My question relates to footings. The original slab is raised as is the patio. What I am thinking is to extend the slab with new footing to the front. You will see the degree to which the garden drops away. The original is 3m deep and if I go to 3.5m (detached house) then I can incorporate it all into the retaining wall by removing it and digging new footings. My question is am I right in thinking this way. The footings would be right down at ground level and remove all the issues of footings in the raised area. I don't mind back filling the area with concrete to ensure more strength. How does the footings get joined to the old? Also how do you join the new slab to the old?
These question are for my own interest as I like to know how it all works before getting trades in.
