The ADU is a good idea for property maximization, but unless it has a separate driveway, it will push your rent in the main house down some because then you aren't renting a single-family house on a lot by itself.

Surround yourself with a support system and keep pushing forward.4.

That said, even with conservative rental income estimates, my living expenses would eventually drop to several hundred dollars less than what I’m currently paying in rent once the house hack starts generating income.I do have cash reserves to weather some rough patches, but the idea of pushing my budget this hard makes me uneasy.

Quote from @Devin James: Gross Margin is an important calculation for developers/builders.Gross Margin = Gross Profit / RevenueWe shoot for a 20% gross margin on our New Construction HomesReal #’s:Home Sales Price: $374KClosing Cost: $18,700Cost of Construction: $258KLand Cost: $30KGross Profit = $67K$67K/$374K = 17.9% Gross MarginCame slightly short of our goal of 20%Homes Values and Build Costs are constantly fluctuatingI wish we had a crystal ball build larger homes. average new build in our market is 2200 square feet, 4 beds, 3 baths, 2 car garage and sells for 515k. construction costs lower if design is good and find the median or average home sale price and push that up. my guess is you built too small. 347k is cheap. we target 429-479k price range in columbus ohio for single family homes and also only purchase close to urban core where premiums are 20% higher and we build smaller like 1500 sq ft where price per square foot goes up. 

Additionally, while rates aren't historically bad right now, they are higher than 4-5 years ago, and they will be even higher for you as an investor than they were as an owner occupant, which is what you were when you bought originally.I get that you are anxious to add to your portfolio, but that could be achieved without touching your first golden goose.Sometimes on BP, the push is to leverage every last spare penny, but that can be a risky game as the markets shift. 

I'd recommend starting with the lower hanging fruit than a large basement reno - if your comps are close but don't quite get you to your number.Finishing the basement (with proper egress) could push you over the top, but confirm with an appraiser first to ensure it counts.

CA is pushing lot subdivisions and you can build up to 2 units per lot.

The lender is pushing you to do this to get an FHA loan.

It snapped off vertically down the middle when he went to the kitchen in the dark in the middle of the night and when he turned to walk back, he walked into a little cupboard door which pushed it back against an edge of the wall, which caused the wood to snap.

And you have to constantly put work in - this system doesn't turn unless you keep pushing it.