At first glance everything looked fine. New concrete patio and a new AC unit, you wouldn't think there would have been any issue on this scraped and rebuilt home. Upon inspection however, it was noted that the rain water was not draining property. The buyers were assured by the builder that all was well. Our inspector was not convinced and explained that the standing water (causing the stain in the picture) was an indication of improper drainage. The city of Denver was actually called back and forced the builder to completely remove and replace the patio with proper drainage totaling approx $8000 in replacement costs.