Hi all, I'm in the process of digging my foundation for a new front porch, and to my pleasant surprise there is already a footing in place. The existing foundation runs away from the house 1 side and the front where I intend to build, leaving just 1 run to dig and tie. The house is a prefab timber build (scotswood 50's house) which is constructed on a what looks like an 8" slab. The existing porch foundation looks like it was added at a later date but again is only around 200mm deep. Usually I'd just break out and dig to a required depth but seriously this concrete is ridiculous in strength. I plan on using 140mm concrete hollows left over from a bar build I did in the summer, so not the lightest of blocks! Am I mad even considering leaving the existing in place? Or could anyone suggest anything else apart from the obvious? TIA Mike.