The mention of replacement of flooring does bring the possibility of future dramas if not done to satisfy all parties – lawyer’s advice to us, always get an acoustic report! Without knowing the age or construction of your place, the flooring does raise some suspicion, you may find that plumbing and electrical work on the property wouldn’t simply just involve those two trades, but may require proof that the passive fire protection wasn’t compromised by penetrations, etc
On waterproofing of bathrooms raised earlier, with class 2 buildings, it’s a fairly low dollar threshold from memory before you run into regulated designs – and all that entails.