One thing kind of surprised me.Basically, if you had asked me (going into the flip) my confidence level on a scale of 1-10 in the accuracy of my rehab cost and ARV, it generally would have been 6-7 for rehab cost and 9 in my ARV.

If you're a particularly prudent buyer, or one who is hypervigilant on the accumulation of small to mid sized issues that arize, I wouldn't doubt there are buyers less concerned with these matters than yourself.Permitting issues certainly concern me, depending on the magnitude.Leases are all I really want accuracy from, they tell the true tale.

You say you are adding a half bath, that is a cost and it should reflect against your numbers for accuracy.

@Davin Randolph Assuming your list is good (scraped for accuracy and effectiveness), mail it or cold call it, either yourself or use a service.

@Sadie Bynum In Colorado many years ago before my time the seller/listing agent actually had to measure and was responsible for the accuracy.

However, the age and thus accuracy of these records offered by third parties online should always be questioned since their data is copied from the source.Finally, there is another type of lien record which is not available at the county courthouse nor is it available online! 

Hello,The current listing service I am using is about to double their rates for their monthly pre-foreclosure listings and I have not been happy with the quality or accuracy of their bankruptcy lists lately either.

For disclosure states , they work great , within +/-3% accuracy .

One can not time the markets with any pinpoint accuracy, but one can be constantly aware of what is going on in a micro and a macro perspective and using some common sense as to where things might lead and how to position yourself to take advantage of that.

Conwell  It varies by market, but Zillow's "Zestimates" are no better than a rough ballpark - and I mean ROUGH.In the Boston market area (where they laughably rate themselves 3 out of 4 stars for accuracy), and we have a median price of probably $550,000, their own claim is that they're within:$27,500 on 55.9% of homes.