I commonly hear that permitting is not an issue unless I am touching plumbing or electrical but just to be safe and avoid any future liabilities, I am trying to understand it is even feasible to get the new rooms/garage permitted for their intended use.3.

The cost of plumbing, drywall, electrical, roof, etc. is the same cost whether you build in Beverly Hills or in Pacoima.

The same applies to buying businesses whether it’s online businesses, plumbing companies, or professional services like a CPA rollup.

For the first part of your question even if you were working with a realtor, I don't personally know many that have a true pulse on rehab costs and I wouldn't make any investment decisions based on their rehab cost projections.My suggestion would be to study how to evaluate the Big 6 rehab costs: roof, siding, windows, HVAC, electrical, and plumbing. 

They are not experts in plumbing. 

We are currently looking at a HUD home in Georgia - I have a couple of questions and can’t seem to find a definitive answer - The home is currently in the OO listing period - our plan would be to buy the home doing extensive renovations (the home is in a “Historical” area so renovations have to be approved) once completed we plan on living there full time - it could take ip to a year to complete or longer I don’t know  - as I see it the OO designation is to be the OO for a min of 12 months - is this after the home has been renovated or after you close on the home - though the house could probably technically be lived in now it does have some water and roof damage and needs complete redo of electrical and plumbing - for me to deem it safe - so not really livable by normal standards - but no way it would be livable in just a couple of months - any thoughts or an actual answer to the OO rules 

The last two tax lien houses that I got and sold had major plumbing issues.

Purchase price: $55,000 Cash invested: $110,000 Sale price: $205,000 This was a 1950 raised home that needed extensive foundation repairs as well as all plumbing, electrical and subflooring.

Does the 60% the condo-hotel takes include the HOA fees or utilities or replacement of furniture/repairs to the unit like plumbing or stuff like towels and sheets etc?

New HVAC, plumbing, electrical, floors, kitchen, baths & added a deck.