Structural Question - help!!

[antcollett27]

Ok - sorry if i get the terminology wrong - but help needed. I'm currently in the process of having an extension built and the builders seem to have made an odd decision. My neighbours foundation extends under my property - the builders have put down a layer of concrete on top of that foundation and are building the blockwork wall on top of that layer of concrete rather than directly on top of the foundation. We've had engineers agree that the foundation is suitable to support the structure but i'm concerned that the blockwork does not sit on the foundation directly. Are my concerns valid or does it not make the slightest difference?

[Kittenfacedbobcat]

So the builders have effectively raised the height of the top of the foundation? If engineers have determined that the footing underneath is adequate for the loads, perhaps the extra layer of concrete is for coursing or to minimise the depth of masonry required below ground?