And whilst the house ended up alright, the other memorable episode for me was
Ilford Sheep Station. Husband-and-wife medical specialists who apparently couldn't use a tape measure, and had to put in new footings and lay new sections of slab "on the fly" because she "couldn't picture how big 2 metres is until I see it", and they wanted to resize the house halfway through the build, resulting in them spending $1.2M to build a house that would have been ~$800K if they'd known how big 2 metres was before they started.
Um, I do get that concept of having to see it, as we've recently designed a new PPOR ourselves. But you can find real-life objects that are 2 metres, and look at those, you know.
We've spent ages drawing chalk marks and tape marks in other rooms, so we could compare the size of a room on the drawings to a real-life object. You don't get the builders to build it and then say "Oh, I wanted a wider corridor than that, let's start over!" FFS, shows that intelligence <> commonsense.
Thank God they're medical specialists and not developers, or they'd be on the streets.