Posted: 20/06/2013 at 23:10
I would advise he hired a skip to get rid of the rubble and large stones, then re-leveled the ground before laying new turf.
I'm happy to be wrong but the section of new lawn where the rubble is will never look the same in terms of growth and greenness as the area where the old lawn was, due to the drainage being different.
I was advised before removing a concrete garage base, a lawn would grow in 6' of soil on top of the concrete or 3' of soil on top of rubble.
It's hard work but I opted to remove both concrete and rubble before laying new turf and it was well worth the effort.