Some serious baked in costs for each. 

I imagined that to mean that a 1920 home with no renovations would cost more to insure than one updated to 2024 specifications.Is this something that is just "known" to flippers/renovators and I am just coming across it?

So I would caution everyone to make sure the replacement cost for your improvements will realistically cover your actual replacement cost in the event of a total loss.

Yes it does, needing to keep the books and properties seperate for proper Tax Reporting and any 1099s you may need to file can be costly.

However, after receiving the survey results, I discovered that the house is located less than 1 foot over the sublot line (see attached image).Here are the options I’m considering:Rent the current house for market value (~$1,500–1,600/month) and convert the detached garage into an ADU to rent for ~$1,000/month.Relocate the house to split the lot, then sell the newly created lot (~$100,000) while renting out the existing house.Relocate the house to split the lot and build a new home on the second lot.Demolish the current house and garage, split the lot, and build two new homes.At this time, I am uncertain about the cost of relocating the house.Questions for the community:Has anyone faced a similar situation?

In the beginning I want to manage by myself to save cost.

(after I deduct all the labor/material costs). 

It's a good practice to overestimate costs and underestimate after-repair values (ARV) to keep your expectations realistic.

The cost would be about 500k about $250k cheaper than it would be to buy another duplex property in my area.

Bonus points if they’re used to working with investors or can help keep costs in check while maintaining quality.Cheers,Kevin I would say this about BRRRRR, especially as a newer investor.