It can and will be thousands of dollars, and you must consider this when looking at your bottom line.  

For instance, if you were analyzing a duplex (each unit is 2 bed 1 bath), would you just put a 2 bed house in Rentometer?

If you put the place up for rent for $1, you'd have a line of people down the street (100% demand).

Wesley - make sure to get  some financing / loan sources  in place and lined up 

House is a 3 bed / 1 bath at about 1000sf and it's on a 7,200sf lot.

You may have something written in the loan documents about the minimum ratio (ie. debt service coverage ratio, times interest earned, etc) that you need to meet in order to comply with their terms, so make sure you have the line items in your financial reports needed to calculate them.

In fact you can have no trade-lines at all and still qualify. 

Hi yall,I am a college student studying civil engineering, I have a job lined up for after school but I still have one more year of school after this year.I am thinking why not but a 4 bedroom house and live in it next year and get a 3.5% FHA loan.

It appears that there is no longer a space between the last line of text someone writes and their signature.

I have a contractor (who doesn't know ADU law), a PM and cleaning crew lined up (I own other properties in The City, and have done VRBO in other houses, so I know those issues).