I had a couple basement contractors out to look at putting in an egress window. One of them said he expected it to be harder than normal on my house, because builders in my area in the 50s didn't use an external form on the first pour of the basement wall so that the foundation wall is probably kind of bell shaped on the outside making it really thick near the bottom. The other contractor didn't mention anything about it.
It wouldn't shock me; they cut every other possible corner. But I can't find anything online about builders doing this. The ground is frozen right now so I can't dig down and find out for sure, but this could make a substantial difference in the feasibility of the project.
Has anyone else heard of this?