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The video does a nice job examining Zillow pricing and the accuracy of their Zestimate feature. The above Real Estate information on are Zillows home value estimates accurate was provided by Bill Gassett, a Nationally recognized leader in his field.
There is always the possibility of some variance from the estimate, but definitive estimates are -5% to +10% accurate. A definitive estimate is based on detailed information from each work package within the WBS or estimates completed at the activity level. rough order of magnitude (ROM) estimate is the least accurate estimate. The PMBOK Guide 4th Edition gives the guidlines that ROMs are -50% to +50% accurate, the PMBOK Guide 5th Edition gives the guidelines that ROMs are -25% to +75% accurate, or potentially even larger.