> One egress on above ground floors is many decades since illegal to develop in EU harmonized bulding codes. The only exception I think if there are sprinkler p

> One egress on above ground floors is many decades since illegal to develop in EU harmonized bulding codes. The only exception I think if there are sprinkler points in the rooms. I might be misunderstanding, but isn't the OP all about how Europe allows single-stairway and the US does not?