Jam
I don't like it
I've always thought this would probably be the case with all reality shows where a house/room has to be built on-screen.
Backyard Blitz, House Rules, Changing Rooms, etc... I think they're all made to look good on TV, especially within a short space of time, but in reality (no pun intended) they're actually not done properly at all. Kind of a catch-22.
Compare the builds on the time frame quick make-overs like The Block, House Rules etc, to the long-term builds that you see on shows like Grand Designs. I know where I'd spend my millions.