Take just the roof alone. On a typical house roof replacement is at least a few thousand dollars and for a nice house in an urban area it will cost at least ten thousand and maybe much more. Even with good materials and installation roofs stay in good condition for around 30 years and become completely degraded in around 50. Some napkin math for a common and kind scenario is another $10k roof every 30 years which is $333/year or $27/month just to keep basic structure integrity.
Now add on to that interior details, floor coverings, appliances, and such many of which are lucky to last 10 years and the numbers start to add up.
Now add on to that interior details, floor coverings, appliances, and such many of which are lucky to last 10 years and the numbers start to add up.