To manage this, find the average electricity, water, and gas usage in your area.

They have all utilities on the property so we use electrical and then every couple of weeks we run a water hose to an external tote we use for our water.

He earned quick money as a wholesaler, and I have a house to keep)Rehab cost: $20k (vinyl floor, interior paint, new dual pane windows, new toilets and bathroom vanities, lights, new landscape, new AC condenser, all done by handyman, spent some extra money for minor plumbing and electric jobs, hydro jet sewer lines, clean up attic (had mice), added some insulationTime spent: 3 weeks (two handymen for the first two weeks, one for the last week)Value after repair: probably around $440kJobs still need to be done later: some dryrots, roof work (it's tile roof, roof doctor quoted me $9k, handyman said probably $5k, home inspector said $15k you can get a new shingle roof.

If there is an area where you are not as confident like plumbing, electrical work, etc... then you can always find a subcontractor for that. 

This means, no electricity and no water as the well can't pump - which also translates to you get one more flush on each toilet and then you are done.  

Has anybody done separate electric meters for an ADU. I believe there were some post several years back. Have one of the tenants that is not willing to pay their share because they don’t think it’s fair. Eviction woul...

While all of this may seem obvious, I have personally encountered all of it in flips in my market, so clearly not every flipper thinks about something as basic as "can my refrigerator door open all the way?".

3) Why was new electrical NEEDED and why so much?

Plumbing roofing electrical hvac water heater everything is new so Im not expecting nothing major for at least 5 years.

So, your prediction that there would be at least $20k more if everything is included should be accurate.The reason for choosing a JADU is that converting the garage into an ADU would require a separate laundry setup and an additional electrical panel in the main house, which would increase the renovation costs for the main house itself.