The best possible way to ensure that you never run into any serious problems or issues with things is to focus on regular maintenance. This principle applies to your relationships, your machines, your house and just any other aspect of your life. The reason a lot of people end up having to spend hundreds to thousands in repairs and so on, is because they usually end up ignoring the maintenance phase and overlooking warning signs, causing their problem to grow out of hand.
If you want to avoid being one of these people, then you need to work on maintenance. So, you need to make sure you take your for maintenance checks and servicing after every 2 months, getting your air conditioning serviced every season and so on. The same principle applies to your house; so you can get a home inspector to come and do an overall inspection of your house once a year or every 2 years. This way, if there are any small problems or issues that might arise, they are fixed immediately. Your drains also need maintenance and oversight, so get a drain survey done after every year to ensure that everything is working properly.
You might think that getting all these inspections and maintenance work done can be unnecessary and costly, but really, it is not. Once a problem is detected early on, it can be quickly dealt with without any damage or problems. So, you do not end up with a very big problem and end up having to spend a huge amount of money getting it resolved and then paying even more to deal with any damage that might have been caused. So, if you think about, it is actually much smarter and will cost you a lot less money if you work this way.