In the 1950's my parents bought a house in a neighborhood of hundreds of the same. All poured concrete and rebar homes on a poured slab. The same forms were used for every house. The roof was set in place by a huge crane. The roof was all one piece. Each home took about three days to complete, right down to the plaster coat on the interior walls. The windows were all steel frame crank open windows that were wet bedded in after the forms were pulled. All the wiring,plumbing, heat and ac ducts ran under and in the slab. All the outlets were in the floors.
Nice cool home in the summer. Cold as a witches tit in winter. Needless to say, not many pictures hung on the walls. About every three years or so a lot of roof flashing and recoating with gravel had to be done for upkeep.
They paid $6,000 for it in the late 50's. Sold it in 1965 for $13,000. Today they go for about $175K. Very nice homes if you like Spartan minimalist living, which is just the way I like it.