Substantial defect Any sidewalk condition meeting the specific criteria in Administrative Code § 19-152 — such as a missing flag, a loose or undermined flag, or a trip hazard — serious enough to trigger a violation.
The Code lists roughly nine categories of substantial defect, and the most commonly cited is a trip hazard: a vertical grade difference of one half inch or more between adjacent flags, or a surface defect at least one inch across and a half inch deep. Others include missing flags, flags cracked badly enough that pieces could be pulled loose, undermined or rocking flags, improper slope that pools water, and unapproved patchwork. DOT inspectors only cite the specific flags containing a substantial defect, not the whole sidewalk, which is why a PIR sometimes flags just a few squares out of a long frontage. Knowing these categories helps an owner tell a genuine violation risk from a cosmetic flaw.
Frequently Asked Questions About Substantial defect
What is a substantial defect?
Any sidewalk condition meeting the criteria in Administrative Code 19-152 that is serious enough to trigger a violation, such as a trip hazard, a missing flag or an undermined flag.
What are the measurement thresholds for a trip hazard?
A vertical grade difference of one half inch or more between adjacent flags, or a surface defect at least one inch across and one half inch deep.
What other conditions count?
Missing flags, flags cracked badly enough that pieces could be pulled loose, undermined or rocking flags, improper slope that pools water, and unapproved patchwork.
Does DOT cite the whole sidewalk?
No. Inspectors cite only the specific flags containing a substantial defect, which is why a PIR may list a few squares out of a long frontage.
Is every crack a substantial defect?
No. Hairline and cosmetic cracking generally does not meet the Code criteria. The defect must fall into one of the listed categories.