How to deal with cracks and water leakage in the owner's house and require property maintenance on the grounds of property transfer? How to avoid it?

Waterproof warranty for 5 years and pipeline for 2 years. During the warranty period, the developer is not responsible. If not handled, you can complain to the local quality supervision department. They specialize in this matter, and then you can't go to court, or you will be responsible for the delay of the warranty period! Property is a supporting role. More information, better suggestions, free professional technical advice on concrete waterproofing and leakage stoppage, avoiding the troubles of repairing today, leaking tomorrow, repairing every year and leaking every year.