@Michael Joseph Allen II I can certainly understand your SO’s concerns. Roommates would indeed reduce the amount of privacy you have. It sounds like you care deeply about your SO’s feelings, and I agree – a couple extra bucks isn’t worth losing someone over. At the end of the day, people are what’s most important.
If your goal is to save or stockpile the most money, then yes, renting out the new house might be the best bet if you can leave for cheaper elsewhere (which it sounds like you are). After all, the beauty of real estate is that investors get paid in multiple ways – principal pay down, appreciation, depreciation, etc. If nothing else, it would get you into the game, which is the hardest part for most people.
That said, I bought my first house in my mid-20s, and lived in it alone. I won’t lie – it was every bit as awesome as I thought it would be. The property has appreciated significantly, is now a cash-flowing rental, and has a significant amount of equity in it. That said, if I had been as financially educated then as I am now, I would have at least considered taking in a roommate, or “house hacking” in a duplex while living in one side. Not saying I would have done it, but I would have considered it.
So, basically, the moral of the story is that you’re in a pretty good position either way. You’re educating yourself, which is AWESOME, and you’re way ahead of where a LOT of people are at your age. You just have to decide your goals. …and maybe talk them over with your SO too. :)
As far as evaluating your cash flow, you would probably still want to account for a little bit of maintenance. While the house itself likely wouldn’t need much – tenants in nice houses can be picky. If you’re wanting professional management, 10% is about the going rate in the area. Know that taxes are higher without a homestead exemption. Assuming the property will be in your name (and not in an LLC) – you will want an umbrella insurance policy. Property management companies often require this as well, and want to be listed as additionally insured. As far as determining the going rental rate for the area, know that in Lubbock, we’re in the off-season now. Demand and rental prices typically dip around this time of year. You can get a pretty good guess of the going rate by evaluating rent prices of similar houses from places like Rentometer (or even *gasp* Zillow) and then confirm with a local property management company.
Wishing you all the best in your endeavors! Feel free to reach out if you need anything else.