At the end of last week, a lot of lumber had been delivered to the backyard, and bright and early (by my standards--about 7:30 AM) they started putting up the frame. These were taken at mid-day.
Below is a closer look--the floor joists in the basement are exposed. Eek!
The cats disappeared at the sound of the first hammer, re-emerging briefly when the guys were at lunch. I am sure there is a wormhole leading to another universe in the house, and they have found it.