I've knocked down the existing garage and rebuilding a longer and wider one myself. I have started digging the footing, the ground is not level therefore I intend to step the footing in three places. My question is this, once I have poured the concrete, after it has dried I'm thinking of using concrete blocks (440X215X100mm) horizontally (100mm thick in the UK) to bring the footing to a level. Can I use concrete blocks? Are they suitable for the job? Or should I be using common bricks? which would be awkward. Obviously the DPM will be couple of bricks above the footing. Any help will be appreciated. The width of the steps will obviously depends on what I'm using to fill the gaps.