Great Question @Mike Levene! I started house hacking in the San Diego area. Definitely high cost of living, where the median home price is nearing $950k.
The first year of house hacking the property I cut my mortgage in half. Everyone thought we were crazy trying to buy in 2019 ("The housing market is going to crash!"), but we figured that the sentiment wasn't going to change in the near future. Time in the market beats timing the market!
We rented out the other unit (it's a duplex), and also the master bedroom in our house hack. We were getting a total of $2,700 per month for both of those renters combined.
When my wife and I moved out of the house, our first 2 years of owning it we were bleeding money on the home. We fixed the foundation and the flat roof issues with pooling water, and rents didn't meet the mortgage just yet.
In 2023, we finally started to cash flow. Rents increased about 5% per year, and when you take 5% on $3,800, that's almost a $200 per month increase for the year! Now, in 2024, we're seeing $4,000 per month just on the main unit and $1,800 on the other unit of the duplex.
Long story short, it's a long term play. We're in it for the long haul, and our future selves will thank us. Let me know if you have any questions on the process of appreciation and even tax advantages, especially since y'all are engineers!
Ian