yes, probably done off-book. The new den (former garage) is about 320 sqft, so it adds about 25% to the original 1350 sqft home which is now listed as 1670 sqft. The old Heat pump might not be big enough.
I have seen before where they will run a duct thru the crawl space wall to the garage (just like cutting another crawl space wall vent). I’m baffled as to why they didn’t do that here. I would have never considered running a flex duct outside behind the bushes.
Definitely not permitted work. This is terrible.
Here is another gem from the same house, to the back of the garage where they put a laundry room.
a single cold water supply pipe comes out of the patio and into the back of the laundry room where it is split into two lines for the cold and hot water supply for the washing machine. oh, yeah, they are both dripping. the drywall below the washer hook-ups is soaked. so is the floor.