I own a condo and i help repair my parents house. Both are approximately the same age. Here is what needs to be fixed in a home in Houston:
1) roof replacement ($4-$6k)
2) foundation repair ($8-12k)
3) siding replacement ($4-$6k)
4) bathroom leaking from second to first story ($1-2k)
5) bathroom (1st floor) replacement due to leaks and damage ($10k)
6) kitchen stove ($4k)
Please when buying a home, research the builder and save ahead of time. The rule is save 5-10% of what your mortgage for capital expenses.
What people won't tell you is that things in your house can immediately break so having 5-10% of the value of your monthly mortgage should help