Property and life investment
For many people home ownership is the biggest investment they will make in their life. This is not just a financial investment but we forget it is also a well being investment. If you house promotes your well being then the return on your physical and mental health, relationships, family etc could be significant.
How many years will clean air add to your day, week, month, year, decade, life? What about life giving water? Or home grown nutritious food? What about quietness and solitude? What about darkness or light?
What about a home based business? If you didn't have to travel an hour to work every morning and from work every afternoon then what could you do with that extra 500 or so hours?