You can just type the square footage of the bathroom and get an estimate for reno.   

I have 3 places in Florida.Here is what I pay (actually, the guests pay):4 Bedroom: $100.005 Bedroom: $115.006 Bedroom: $150.00 (it is a lot more square footage and two stories)This includes everything and the houses are very clean every time.I would not skimp on cleaning.

I have talked to 2 general contractors in which they stated that for interior work of the house without adding square footage to the home, it would not make sense to delay renovations to pull out permits.

Minimum square footage is 1,150 and you need a sewer or septic connection. 

Based on the square footage and the number of bedrooms and baths that would be somewhat accurate, but the elaborate landscaping, the workmanship of the home, and the extras that come with it are not taken into consideration.

IMO Adding square footage is the best way to add equity. 

Make notecards and tape them on the bathroom window to memorize all the terms.Valuation, how to find comparables, how to determine if the comp had a loan or was played with, what square footage counts, how room counts work, how to measure, when is a basement/or room square footage or not...

To calculate a safe ARV, look at the properties with the same # of bedrooms and bathrooms and similar square footage as the one you're looking to purchase, then find the top 25 percentile of homes that sold up to 9 months prior.

Therefore, you're either buying a distressed property and fixing it up or you're doing something special to the property to increase value like adding square footage.

@Lance NelsonMaking broad generalizations here, and you shouldn't use the Zestimate to determine value, but for illustrative purposes let's say that that is indeed the determined value of those properties.The $/sqft of the larger properties is $350,000/1,405 = 249$/sqftThe $sqft of your property is $307,000/1,250=246$/sqftThere is usually an inverse relationship between the square footage of a property and it's $/sqft so a smaller property should fetch a higher $/sqft.