Further investigation of foundations

P decides that the amount quoted for the foundations is excessive. We are concerned because the engineering for the house next door doesn't specify foundations that are anything like as deep as ours. As the walls are going to be built side by side, they can't both be right. In consultation with the builder, have decided to waiting until they demolish the sheds next door, then redo the soil test on the boundary line. It will cost in the short term, but it may save us money long term if we don't need such expensive foundations.