The safest route is new construction or buying something already extensively remodeled.

A remodel.

Then we will go to the next project for another 15 to 20 mins where we are doing a full remodel on the home for a rental home and permits in process for a new construction ADU, and then we will end in at the 3rd project also a new construction ADU.

After I was done pulling a permit for a garage conversion to give me a proper master bdrm, walk in closet, mud room and last but not least 2nd badly needed bathroom (it should be against the law to only have one bath in a home) I got quotes for a "rough in" for the toilet in the bathroom that were anywhere from 7k to 22k.

I'm not in the business of real estate (flipping, remodeling, sourcing off-market deals, putting together creative deals, etc.). 

If you are doing a major remodel or substantial development this will quite often trigger the need for a properly sized system to be installed.

This is the simplest method, but it also means your tenants are more likely to abuse the utilities by leaving windows open with the heat or A/C running, leaving lights on, ignoring the toilet that constantly flushes on its own, etc.3.

The market I’m in is great for renters (but the quality of renters can make you pay attention to their applications)  I’m rehabbing the 3rd house now, plan to remodel the 2nd house after I’m complete and then unsure if I should:-obtain traditional mortgage then should I cash out refi and find more property?

Walls Remove/treatmildew (per surface) $15.00 Repairholeinwall $55.00 Repaint(perwall/ceiling) $30.00 Doors Replacedoor(inside) $165.00 Replacedoor(outside) $485.00 Electrical Replacelightbulb $3.00 Replacelightfixtureglobe $20.00 Replacelightfixture $65.00 Replaceelectricaloutlet/switch $15.00 Replaceelectricalcoverplate $2.00 Plumbing Replacekitchenfaucet $150.00 Replacebathroomfaucet $105.00 Replacefaucethandle $20.00 Replacefaucetaerator $10.50 Replaceshowerhead $27.00 Replacetoilet $175.00 Replace toilet seat $25.00 Locks Replacekey(doorormailbox) $10.00 Replacecylindricaldoorlock $35.00 Replacedeadboltlock $25.00 WindowsandWindowCoverings Replacewindowpane(sgl) $75.00 Replacewindowpane(dbl) $125.00 Replaceminiblind $20.00 Rescreenwindowscreen $25.00 Replace window screen and frame $50.00 Miscellaneous Replacerefrigeratorshelf $25.00 Replacestove/ovenknob $20.00 Replaceplasticcountertop $275.00 Replacemirror $45.00 Replacemedicinecabinet $75.00 Replacetowelbar $25.00 Replaceshowercurtainrod $25.00 Replace shower curtain & rings $13.00 Replaceshower/tubenclosure $350.00 Replacethermostat $80.00 Replacefireextinguisher $30.00 Removejunkanddebris (per area) $35.00 Replacesmokedetector $15.00 Replacecombodetector/alarm $40.00 Replace alarm battery(perbattery) $2.00 Replace drop ceiling tile $10.00 Replace wireless doorbell $35.00 Actual charges may vary based on condition and/or vendor bill.

Often what has caused the most damage to a structure is past owners careless remodeling cutting notches holes or completely through structural members of the home.