I own a house in Skåne. According to the floor plan, there should be lightweight concrete in the basement (not sure if it's just the family room or the entire basement). Now I've had the opportunity to take a closer look at the concrete in the family room, and this is what it looks like. Is it regular lightweight concrete or blue? I am attaching pictures from the technical description where it says concrete hollow stone, the floor plan where it clearly says lightweight concrete, and also pictures I have taken myself. Thanks in advance!
It doesn't look like blåbetong. Blåbetong is specifically blue(-gray). This looks like regular gray concrete. It's not clear whether the lättbetong is on the inside or outside of the wall (concrete hole blocks), but you'll notice when you chip/drill/saw into it.