It is indeed fascinating to see the new extension taking shape. Yesterday, a velux window was installed in the roof. (Of the house, not the extension.) It is not yet letting light through to the bathroom underneath, but I am sure the spiders in the loft are enjoying the sunlight. I have been amazed at the sheer amount of work in this new-build, which is to provide an extra shower-room and sun-room.
Well done Jock the joiner.