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The place I bought had been fully renovated and never lived in and, as it was done by a private developer, had no warranty.
Before exchanging I went in with a big list of stuff to test and made sure everything was working. I picked up on a few things which they subsequently fixed but after moving in we have found various minor stuff like small leaks that needed to be fixed, the boiler was inconsistent, etc
Cheers - it's a weird one in that it was bought by a private individual who then leased it back to the developers to use as a show home, and is now trying to sell it on at 20% markup. The 2 year warranty has just expired which makes me concerned about bits like showers and baths that won't have been used.