Like I can replace wood paneling with Sheetrock without a permit but I cannot put insulation into the walls without a permit.

Because if they aren't willing to invest $10 in financial freedom your wasting your time.

People waste a lot of time and money on STR courses from "gurus" when they could find answers to 99% of questions right here in the forums.

Jobs range from fixing a door that isn't closing properly to putting a up a wall to close up an entryway. 

And I bet when you see the P&Ls/Tax returns on this guys amazing business, it becomes less amazing.Don't waste your time, you're running a business here.....right?

Carpentry - Framing (walls, joists, sills, doors, windows), subfloors3.

For electrical and plumbing, the walls would need to be opened.

However, you can actually save millions of dollars in taxes by starting during the blueprint phase.Here are some examples of ways to save on taxes:For conference rooms in a hotel, Instead of installing regular walls, if you install moveable walls, the walls could be depreciated using the rules of bonus depreciation.For a multi-family apartment complex, changing the model of the bathroom exhaust fan to a variable speed could help qualify for the energy credit which is $2,000/unit.For a large apartment complex, installing a ceiling fan could allow you to qualify for 45L tax credits.For a hotel, if the porte-cochere is detached from the hotel building, it could be fully deductible in year one as it could be considered a land improvement.

@Jaron Walling thank you for your response and suggestions. 

You likely have to under pin the foundation and waterproof the slab, but having some walls, a roof and a good portion of the slab/foundation is a cost saver in many applications (not all).