I have a 57 year old ranch with a basement and over the years a huge crack has developed across the basement. The back of the house does not have the frost line 4' below grade, it's about 6 ". I believe due to frost heaves- I'm in Massachusetts- it has caused a portion of the footing to sink and because the floor on that side of the house is only about 2" thick, it has cracked and shifted that part of the basement. I have got a ton of quotes, all with different solutions, the majority, which are VERY expensive. How do I know who has the right answer? Instead of underpinning and piers etc, couldn't I just have landscapers fill 4' of soil around the back, put in drainage and jack slab the floor????? Any thoughts would be appreciated...