There is no guarantee of accuracy or completeness.

Like Trulia/Zillow etc. it seems go give a fairly decent assessment on the subdivision overall; however, the accuracy seems to fluctuate greatly when it comes to specific comps.In addition to that, some comps that had sold a month or two back were not even present.

So, to that point I am always upfront with the contractors we work with that scheduling and accuracy are paramount.

Check the accuracy of their claims on all expenses.

There is no thought given to the accuracy of the appraisal.This appraisal stuff makes no sense anymore.

Obviously we can't predict the future with any real accuracy, so who knows what the broad market will think about ADUs 30 years from now, but in my market even though they are uncommon, they spike the value of homes anytime they are well kept. 

How about the accuracy of realtor.com in regards to their taxes and insurance under their Payment Calculator?

However, a preparer’s credentials and level of expertise may have a bearing on the overall accuracy and quality of a study.In general, a study by a construction Engineer is more reliable than one conducted by someone with no engineering or construction background.

In other words, it's the lazy way of doing something, that produces an average to be applied to all RE that the rule is used on...when pinpoint accuracy is needed. 

It's impossible to predict the future of the market with much accuracy, and most people that try end up being wrong.