We have a new build here, but the builder went bust, and after a protracted legal case and lots of shenanigans with our banks, the court and the builder’s financiers and a rich family in Hamburg and an estate agent who had also funded him we (the 5 buyers in in the apartment block) finally found a deal and bought the half finished construction site from the insolvency court. We then became property developers by default.They have to give a 10 year guarantee so 11 years
I would want to go through this again but it has been a fascinating time and we unearthed some shocking work and cut-corners from the builder. We had to redo significant chunks of the build.