You’ll need to sell some food, sandwiches, muffins, etc  too I would think....coolers, display cases/coolers, dishes, dishwashers, supplies, costs for labor, rent, utilities, insurance, licenses, permits, inspections, etc, etc.

It's really a shame because the code where I own my investment property does not have an owner-occupancy restriction to permit an ADU--as it should be if a town wants to increase the supply of housing!

Consider the following scenario, presented by a question.Buyer 1 and Buyer 2 live in a low supply high demand multi family housing area.

It seems to me there is a huge supply from people renting these so that makes the price to rent these cheap.

https://www.har.com/content/newsroom/Houston Real Estate Highlights in October Single-family home sales increased 4.7 percent year-over-year, with 6,716 units sold;Days on Market (DOM) for single-family homes was 57 versus 61 a year earlier;Total property sales rose 6.0 percent, with 8,127 units sold;Total dollar volume jumped 9.3 percent to $2.3 billion;The single-family home median price climbed 3.6 percent to $234,653, an October high;The single-family home average price also achieved an October record, rising 3.5 percent to $294,500;Single-family homes months of inventory reached a 3.9-months supply, up fractionally from 3.7 months last October, but below the national supply of 4.4 months reported by NAR;Townhome/condominium sales dropped 2.9 percent, with the average price up 4.9 percent to $206,838 and the median price down 2.2 percent at $152,900;Leases of single-family homes rose 7.3 percent with the average rent down 1.1 percent to $1,754;Volume of townhome/condominium leases fell 6.8 percent with the average rent up 1.2 percent to $1,550.

@Anand S. everything that was already said PLUS (something to keep in mind AND continue to watch as government policy changes) is the unskilled / semi-skilled labor supply.

I was looking for a Template of a line budget to supply to contractors. 

Try to go see their work if you can.Make sure their licenses are current (yes, they'll show up with expired licenses)They'll want some money up front for parts and supplies and to pay their hourly subs/workers.

There is also market availability to deal with, supply and demand and on and on and on. 

Scheduling, skip tracing, data entry, photo editing, pricing supplies, transcribing calls, etc. are all $10 an hour items you can outsource pretty easily.I think local $10/hr tasks are harder to outsource like placing bandit signs, picking up materials, etc..