Ours was built as a house but had been split into two flats. It then caught fire and the repairs returned it to being one whole house which is what we bought.
When we moved in it had been empty for a few months after all the work had been 'completed' but there had been no-one to snag it so loads of things were a bit off or just wrong...
The bathroom door wouldn't stay shut. Took me ages to realise that it was because there was no 'thing' on the door-frame for the lock to actually latch into.
The loo wouldn't lock because the 'thing' on the door-frame was out of alignment and the door frame isn't flush to the wall, it's about 3 inches out.
The dining-room door won't close properly because the door-handle is about 1-2mm too close to the door-frame. This one pisses me off every day.
The boiler wouldn't start.
The shower didn't give hot water, and has always been a bit intermittent, there was no shower curtain rail or shower doors.
The utility room flooded when I used the washing machine - it was all plumbed in correctly, I did it myself, but the pipework done by the builders was shoddy. I got them back to sort that out.
The water stop-cock is behind the fridge.
The kitchen is really badly designed and has only 2 drawers. I LONG for drawers.
And all the plug sockets are part-way up the wall, presumably to comply with DDA regs, even though the corridor and doorways aren't wide enough for a wheelchair and there is a step up to the house.
Weirdest of all, the tv just wouldn't work, the aerial was plugged into the wall socket but the screen kept saying there was no signal. About a week later I was in the garden and I looked up at the roof, only to realise that there was no actual aerial up there. So we had to get an aerial fitted. The irony being that the house had been given a whole new roof but they hadn't put the aerial back up.
I love my house, it's lovely but the refurb was a piss-take. I'd never use that company if I need work doing.